Electricity Introductory Physics Canadian Academy Image from: http://www.penguintutor.com/electronics/electrical- safety
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Transcript
ElectricityIntroductory Physics
Canadian Academy
Image from httpwwwpenguintutorcomelectronicselectrical-safety
Unit Questions ldquoHow can we power a communityrdquo
Enduring Understandings bull Electricity can be harnessed for the benefit of humans
Areas of interactionHuman Ingenuity The development of electrical technologies revolutionised culture
Environments Can we maximise efficiency in order to maximise sustainability
Criterion Assessment Tasks
B Knowledge amp Understanding
Formaive Current Elecricity Flipbook
Electricity
Electrostatics ndash Whaddya KnowThink share scribble it on a whiteboard
Draw an AtomWhat are the names sizes charges and positions of the componentsWhat is the relevance of this to electricity
Discover electrostatics demonstrationsTry these demonstrations with your group and keep notes on the sheets provided Can you explain your observations Use the resources on the GoogleSite if you need to
Image balloon static from httpwwweducationcomscience-fairarticlephysics_pickup Image simple electroscope from httpwwwschool-for-championscomsciencestatic_detectionhtmImage balloon amp water from httpwwwthenakedscientistscomHTMLcontentkitchenscienceexpbending-water-static-attraction
bull Electrification bull Charged tapes
bull Opposite sides of an acrylic sheetbull Triboelectric seriesbull Electroscopes
bull Balloon tricks
Can you explain whatrsquos happeningTry this visualisation from PhET Labs httpphetcoloradoeduensimulationballoons
Find out more about the triboelectric series
Do electrons move from the balloon to the jumper or the other way round ndash why
Image simple electroscope from httpwwwschool-for-championscomsciencestatic_detectionhtm
What is happening in the electroscope
What happens when the leaves get lsquostuckrsquo apart
How could you get them to go back to their original positions Why does this work
Properties of ChargeCharge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
neutral
strong negative charge
weak positive charge
Add electrons to each of these systems
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
Properties of ChargeCharge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
neutral
strong negative charge
weak positive charge
Add electrons to each of these systems
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
- - - - - - - - - -
- - - - -
- - - - - - - - -- -- -
-- - - - - - -
Remember electrons can be added or removed but
protons stay where they are
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move
httpphetcoloradoeduensimulationballoons
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
Triboelectric series
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
What happens whenhellip1 Aluminium is rubbed against human hair2 Fur is rubbed against styrofoam3 Teflon is rubbed against styrofoam4 Dry hands are rubbed against polyethylene
Where do leather nylon polyester and hard rubber fit on the series
Find out more httpregentspreporgRegentsphysicsphys03atribodefaulthtm
Triboelectric series
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
What happens whenhellip1 Aluminium is rubbed against human hair2 Fur is rubbed against styrofoam3 Teflon is rubbed against styrofoam4 Dry hands are rubbed against polyethylene
Where do leather nylon polyester and hard rubber fit on the series
leather nylonpolyester
hard rubber
Find out more httpregentspreporgRegentsphysicsphys03atribodefaulthtm
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - - - - + + - - +strong negative charge neutral
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - - - - + + - - +electrons move until they are balanced in both objects
Conductors are materials which allow electrons to flow freely through them
Insulators are materials which do not allow electrons to flow freely
examples examples
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - + + - - - - - +negative charge negative charge
What would happen if a strong positive charge made contact with a neutral object
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
- + - ++ - + -
neutral
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + - - + + - -
separation of charge electrons
are repelled
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
electrons are conducted into the
ground
insulator
The Earth is so big it is always considered neutral
The ground is then disconnected
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
object is left positively charged
insulator
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move Charge is conserved
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
ConductionTransfer of electrons from a charged material to another material through contact
Contact is needed Electrons flow more freely through good conductors There is net flow until there is balance of charge between the two objects
InductionDoes not use contact between two materials but does require one to be grounded
Separation of charge occurs as elecrons can move but protons cannot By cutting the ground the induced object remains charged
Properties of electrostatic charge
Image pithball electroscope from httpenwikipediaorgwikiElectroscope
Observe and explainWool is used to charge an acrylic rod It is brought near the neutral pithball attracting it
It touches the pithball after which it is repelled Why does this happen
Which force is stronger ndash the electromagnetic force or gravity Explain your reasoning
lsquoLikersquo charges repel lsquoOppositersquo charges attractOnly electrons have the freedom to move through a material
Build your own simple electroscope
Image simple electroscope from httpenwikipediaorgwikiElectrometer
What materials do you need
Test it and get some photos- in the resting state- when approached by a negatively
charged object- when approached by a positively
charged object
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
- - - - - - - -
- - - -
+
++
-- -
-
Negatively charged rod
Negatively charged leaves
Induced charge separation- electrons in the rod repel electrons
in the electroscope- electrons are forced into the leaves- negatively charged leaves repel
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
+ + + + + +
- -- -
+++
- ---
Positively charged rod
Positively charged leaves
Induced charge separation- protons in the rod attract electrons in
the electroscope- electrons move away from the leaves- positively charged leaves repel
Can we measure charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
How could we use an electroscope to measure the charge of an object
Properties of Charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Charge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
Electrostatic discharges
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Explain what is happening in these animations They are different
httpphetcoloradoeduensimulationtravoltage httpregentspreporgRegentsphysicsphys03atribo
What environmental conditions favour static shocks What can you do to reduce the chance of getting a static shock
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
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- Slide 8
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- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
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- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
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- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Unit Questions ldquoHow can we power a communityrdquo
Enduring Understandings bull Electricity can be harnessed for the benefit of humans
Areas of interactionHuman Ingenuity The development of electrical technologies revolutionised culture
Environments Can we maximise efficiency in order to maximise sustainability
Criterion Assessment Tasks
B Knowledge amp Understanding
Formaive Current Elecricity Flipbook
Electricity
Electrostatics ndash Whaddya KnowThink share scribble it on a whiteboard
Draw an AtomWhat are the names sizes charges and positions of the componentsWhat is the relevance of this to electricity
Discover electrostatics demonstrationsTry these demonstrations with your group and keep notes on the sheets provided Can you explain your observations Use the resources on the GoogleSite if you need to
Image balloon static from httpwwweducationcomscience-fairarticlephysics_pickup Image simple electroscope from httpwwwschool-for-championscomsciencestatic_detectionhtmImage balloon amp water from httpwwwthenakedscientistscomHTMLcontentkitchenscienceexpbending-water-static-attraction
bull Electrification bull Charged tapes
bull Opposite sides of an acrylic sheetbull Triboelectric seriesbull Electroscopes
bull Balloon tricks
Can you explain whatrsquos happeningTry this visualisation from PhET Labs httpphetcoloradoeduensimulationballoons
Find out more about the triboelectric series
Do electrons move from the balloon to the jumper or the other way round ndash why
Image simple electroscope from httpwwwschool-for-championscomsciencestatic_detectionhtm
What is happening in the electroscope
What happens when the leaves get lsquostuckrsquo apart
How could you get them to go back to their original positions Why does this work
Properties of ChargeCharge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
neutral
strong negative charge
weak positive charge
Add electrons to each of these systems
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
Properties of ChargeCharge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
neutral
strong negative charge
weak positive charge
Add electrons to each of these systems
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
- - - - - - - - - -
- - - - -
- - - - - - - - -- -- -
-- - - - - - -
Remember electrons can be added or removed but
protons stay where they are
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move
httpphetcoloradoeduensimulationballoons
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
Triboelectric series
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
What happens whenhellip1 Aluminium is rubbed against human hair2 Fur is rubbed against styrofoam3 Teflon is rubbed against styrofoam4 Dry hands are rubbed against polyethylene
Where do leather nylon polyester and hard rubber fit on the series
Find out more httpregentspreporgRegentsphysicsphys03atribodefaulthtm
Triboelectric series
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
What happens whenhellip1 Aluminium is rubbed against human hair2 Fur is rubbed against styrofoam3 Teflon is rubbed against styrofoam4 Dry hands are rubbed against polyethylene
Where do leather nylon polyester and hard rubber fit on the series
leather nylonpolyester
hard rubber
Find out more httpregentspreporgRegentsphysicsphys03atribodefaulthtm
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - - - - + + - - +strong negative charge neutral
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - - - - + + - - +electrons move until they are balanced in both objects
Conductors are materials which allow electrons to flow freely through them
Insulators are materials which do not allow electrons to flow freely
examples examples
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - + + - - - - - +negative charge negative charge
What would happen if a strong positive charge made contact with a neutral object
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
- + - ++ - + -
neutral
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + - - + + - -
separation of charge electrons
are repelled
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
electrons are conducted into the
ground
insulator
The Earth is so big it is always considered neutral
The ground is then disconnected
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
object is left positively charged
insulator
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move Charge is conserved
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
ConductionTransfer of electrons from a charged material to another material through contact
Contact is needed Electrons flow more freely through good conductors There is net flow until there is balance of charge between the two objects
InductionDoes not use contact between two materials but does require one to be grounded
Separation of charge occurs as elecrons can move but protons cannot By cutting the ground the induced object remains charged
Properties of electrostatic charge
Image pithball electroscope from httpenwikipediaorgwikiElectroscope
Observe and explainWool is used to charge an acrylic rod It is brought near the neutral pithball attracting it
It touches the pithball after which it is repelled Why does this happen
Which force is stronger ndash the electromagnetic force or gravity Explain your reasoning
lsquoLikersquo charges repel lsquoOppositersquo charges attractOnly electrons have the freedom to move through a material
Build your own simple electroscope
Image simple electroscope from httpenwikipediaorgwikiElectrometer
What materials do you need
Test it and get some photos- in the resting state- when approached by a negatively
charged object- when approached by a positively
charged object
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
- - - - - - - -
- - - -
+
++
-- -
-
Negatively charged rod
Negatively charged leaves
Induced charge separation- electrons in the rod repel electrons
in the electroscope- electrons are forced into the leaves- negatively charged leaves repel
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
+ + + + + +
- -- -
+++
- ---
Positively charged rod
Positively charged leaves
Induced charge separation- protons in the rod attract electrons in
the electroscope- electrons move away from the leaves- positively charged leaves repel
Can we measure charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
How could we use an electroscope to measure the charge of an object
Properties of Charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Charge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
Electrostatic discharges
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Explain what is happening in these animations They are different
httpphetcoloradoeduensimulationtravoltage httpregentspreporgRegentsphysicsphys03atribo
What environmental conditions favour static shocks What can you do to reduce the chance of getting a static shock
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Electrostatics ndash Whaddya KnowThink share scribble it on a whiteboard
Draw an AtomWhat are the names sizes charges and positions of the componentsWhat is the relevance of this to electricity
Discover electrostatics demonstrationsTry these demonstrations with your group and keep notes on the sheets provided Can you explain your observations Use the resources on the GoogleSite if you need to
Image balloon static from httpwwweducationcomscience-fairarticlephysics_pickup Image simple electroscope from httpwwwschool-for-championscomsciencestatic_detectionhtmImage balloon amp water from httpwwwthenakedscientistscomHTMLcontentkitchenscienceexpbending-water-static-attraction
bull Electrification bull Charged tapes
bull Opposite sides of an acrylic sheetbull Triboelectric seriesbull Electroscopes
bull Balloon tricks
Can you explain whatrsquos happeningTry this visualisation from PhET Labs httpphetcoloradoeduensimulationballoons
Find out more about the triboelectric series
Do electrons move from the balloon to the jumper or the other way round ndash why
Image simple electroscope from httpwwwschool-for-championscomsciencestatic_detectionhtm
What is happening in the electroscope
What happens when the leaves get lsquostuckrsquo apart
How could you get them to go back to their original positions Why does this work
Properties of ChargeCharge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
neutral
strong negative charge
weak positive charge
Add electrons to each of these systems
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
Properties of ChargeCharge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
neutral
strong negative charge
weak positive charge
Add electrons to each of these systems
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
- - - - - - - - - -
- - - - -
- - - - - - - - -- -- -
-- - - - - - -
Remember electrons can be added or removed but
protons stay where they are
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move
httpphetcoloradoeduensimulationballoons
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
Triboelectric series
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
What happens whenhellip1 Aluminium is rubbed against human hair2 Fur is rubbed against styrofoam3 Teflon is rubbed against styrofoam4 Dry hands are rubbed against polyethylene
Where do leather nylon polyester and hard rubber fit on the series
Find out more httpregentspreporgRegentsphysicsphys03atribodefaulthtm
Triboelectric series
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
What happens whenhellip1 Aluminium is rubbed against human hair2 Fur is rubbed against styrofoam3 Teflon is rubbed against styrofoam4 Dry hands are rubbed against polyethylene
Where do leather nylon polyester and hard rubber fit on the series
leather nylonpolyester
hard rubber
Find out more httpregentspreporgRegentsphysicsphys03atribodefaulthtm
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - - - - + + - - +strong negative charge neutral
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - - - - + + - - +electrons move until they are balanced in both objects
Conductors are materials which allow electrons to flow freely through them
Insulators are materials which do not allow electrons to flow freely
examples examples
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - + + - - - - - +negative charge negative charge
What would happen if a strong positive charge made contact with a neutral object
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
- + - ++ - + -
neutral
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + - - + + - -
separation of charge electrons
are repelled
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
electrons are conducted into the
ground
insulator
The Earth is so big it is always considered neutral
The ground is then disconnected
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
object is left positively charged
insulator
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move Charge is conserved
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
ConductionTransfer of electrons from a charged material to another material through contact
Contact is needed Electrons flow more freely through good conductors There is net flow until there is balance of charge between the two objects
InductionDoes not use contact between two materials but does require one to be grounded
Separation of charge occurs as elecrons can move but protons cannot By cutting the ground the induced object remains charged
Properties of electrostatic charge
Image pithball electroscope from httpenwikipediaorgwikiElectroscope
Observe and explainWool is used to charge an acrylic rod It is brought near the neutral pithball attracting it
It touches the pithball after which it is repelled Why does this happen
Which force is stronger ndash the electromagnetic force or gravity Explain your reasoning
lsquoLikersquo charges repel lsquoOppositersquo charges attractOnly electrons have the freedom to move through a material
Build your own simple electroscope
Image simple electroscope from httpenwikipediaorgwikiElectrometer
What materials do you need
Test it and get some photos- in the resting state- when approached by a negatively
charged object- when approached by a positively
charged object
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
- - - - - - - -
- - - -
+
++
-- -
-
Negatively charged rod
Negatively charged leaves
Induced charge separation- electrons in the rod repel electrons
in the electroscope- electrons are forced into the leaves- negatively charged leaves repel
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
+ + + + + +
- -- -
+++
- ---
Positively charged rod
Positively charged leaves
Induced charge separation- protons in the rod attract electrons in
the electroscope- electrons move away from the leaves- positively charged leaves repel
Can we measure charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
How could we use an electroscope to measure the charge of an object
Properties of Charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Charge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
Electrostatic discharges
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Explain what is happening in these animations They are different
httpphetcoloradoeduensimulationtravoltage httpregentspreporgRegentsphysicsphys03atribo
What environmental conditions favour static shocks What can you do to reduce the chance of getting a static shock
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Draw an AtomWhat are the names sizes charges and positions of the componentsWhat is the relevance of this to electricity
Discover electrostatics demonstrationsTry these demonstrations with your group and keep notes on the sheets provided Can you explain your observations Use the resources on the GoogleSite if you need to
Image balloon static from httpwwweducationcomscience-fairarticlephysics_pickup Image simple electroscope from httpwwwschool-for-championscomsciencestatic_detectionhtmImage balloon amp water from httpwwwthenakedscientistscomHTMLcontentkitchenscienceexpbending-water-static-attraction
bull Electrification bull Charged tapes
bull Opposite sides of an acrylic sheetbull Triboelectric seriesbull Electroscopes
bull Balloon tricks
Can you explain whatrsquos happeningTry this visualisation from PhET Labs httpphetcoloradoeduensimulationballoons
Find out more about the triboelectric series
Do electrons move from the balloon to the jumper or the other way round ndash why
Image simple electroscope from httpwwwschool-for-championscomsciencestatic_detectionhtm
What is happening in the electroscope
What happens when the leaves get lsquostuckrsquo apart
How could you get them to go back to their original positions Why does this work
Properties of ChargeCharge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
neutral
strong negative charge
weak positive charge
Add electrons to each of these systems
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
Properties of ChargeCharge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
neutral
strong negative charge
weak positive charge
Add electrons to each of these systems
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
- - - - - - - - - -
- - - - -
- - - - - - - - -- -- -
-- - - - - - -
Remember electrons can be added or removed but
protons stay where they are
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move
httpphetcoloradoeduensimulationballoons
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
Triboelectric series
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
What happens whenhellip1 Aluminium is rubbed against human hair2 Fur is rubbed against styrofoam3 Teflon is rubbed against styrofoam4 Dry hands are rubbed against polyethylene
Where do leather nylon polyester and hard rubber fit on the series
Find out more httpregentspreporgRegentsphysicsphys03atribodefaulthtm
Triboelectric series
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
What happens whenhellip1 Aluminium is rubbed against human hair2 Fur is rubbed against styrofoam3 Teflon is rubbed against styrofoam4 Dry hands are rubbed against polyethylene
Where do leather nylon polyester and hard rubber fit on the series
leather nylonpolyester
hard rubber
Find out more httpregentspreporgRegentsphysicsphys03atribodefaulthtm
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - - - - + + - - +strong negative charge neutral
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - - - - + + - - +electrons move until they are balanced in both objects
Conductors are materials which allow electrons to flow freely through them
Insulators are materials which do not allow electrons to flow freely
examples examples
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - + + - - - - - +negative charge negative charge
What would happen if a strong positive charge made contact with a neutral object
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
- + - ++ - + -
neutral
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + - - + + - -
separation of charge electrons
are repelled
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
electrons are conducted into the
ground
insulator
The Earth is so big it is always considered neutral
The ground is then disconnected
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
object is left positively charged
insulator
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move Charge is conserved
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
ConductionTransfer of electrons from a charged material to another material through contact
Contact is needed Electrons flow more freely through good conductors There is net flow until there is balance of charge between the two objects
InductionDoes not use contact between two materials but does require one to be grounded
Separation of charge occurs as elecrons can move but protons cannot By cutting the ground the induced object remains charged
Properties of electrostatic charge
Image pithball electroscope from httpenwikipediaorgwikiElectroscope
Observe and explainWool is used to charge an acrylic rod It is brought near the neutral pithball attracting it
It touches the pithball after which it is repelled Why does this happen
Which force is stronger ndash the electromagnetic force or gravity Explain your reasoning
lsquoLikersquo charges repel lsquoOppositersquo charges attractOnly electrons have the freedom to move through a material
Build your own simple electroscope
Image simple electroscope from httpenwikipediaorgwikiElectrometer
What materials do you need
Test it and get some photos- in the resting state- when approached by a negatively
charged object- when approached by a positively
charged object
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
- - - - - - - -
- - - -
+
++
-- -
-
Negatively charged rod
Negatively charged leaves
Induced charge separation- electrons in the rod repel electrons
in the electroscope- electrons are forced into the leaves- negatively charged leaves repel
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
+ + + + + +
- -- -
+++
- ---
Positively charged rod
Positively charged leaves
Induced charge separation- protons in the rod attract electrons in
the electroscope- electrons move away from the leaves- positively charged leaves repel
Can we measure charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
How could we use an electroscope to measure the charge of an object
Properties of Charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Charge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
Electrostatic discharges
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Explain what is happening in these animations They are different
httpphetcoloradoeduensimulationtravoltage httpregentspreporgRegentsphysicsphys03atribo
What environmental conditions favour static shocks What can you do to reduce the chance of getting a static shock
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Discover electrostatics demonstrationsTry these demonstrations with your group and keep notes on the sheets provided Can you explain your observations Use the resources on the GoogleSite if you need to
Image balloon static from httpwwweducationcomscience-fairarticlephysics_pickup Image simple electroscope from httpwwwschool-for-championscomsciencestatic_detectionhtmImage balloon amp water from httpwwwthenakedscientistscomHTMLcontentkitchenscienceexpbending-water-static-attraction
bull Electrification bull Charged tapes
bull Opposite sides of an acrylic sheetbull Triboelectric seriesbull Electroscopes
bull Balloon tricks
Can you explain whatrsquos happeningTry this visualisation from PhET Labs httpphetcoloradoeduensimulationballoons
Find out more about the triboelectric series
Do electrons move from the balloon to the jumper or the other way round ndash why
Image simple electroscope from httpwwwschool-for-championscomsciencestatic_detectionhtm
What is happening in the electroscope
What happens when the leaves get lsquostuckrsquo apart
How could you get them to go back to their original positions Why does this work
Properties of ChargeCharge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
neutral
strong negative charge
weak positive charge
Add electrons to each of these systems
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
Properties of ChargeCharge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
neutral
strong negative charge
weak positive charge
Add electrons to each of these systems
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
- - - - - - - - - -
- - - - -
- - - - - - - - -- -- -
-- - - - - - -
Remember electrons can be added or removed but
protons stay where they are
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move
httpphetcoloradoeduensimulationballoons
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
Triboelectric series
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
What happens whenhellip1 Aluminium is rubbed against human hair2 Fur is rubbed against styrofoam3 Teflon is rubbed against styrofoam4 Dry hands are rubbed against polyethylene
Where do leather nylon polyester and hard rubber fit on the series
Find out more httpregentspreporgRegentsphysicsphys03atribodefaulthtm
Triboelectric series
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
What happens whenhellip1 Aluminium is rubbed against human hair2 Fur is rubbed against styrofoam3 Teflon is rubbed against styrofoam4 Dry hands are rubbed against polyethylene
Where do leather nylon polyester and hard rubber fit on the series
leather nylonpolyester
hard rubber
Find out more httpregentspreporgRegentsphysicsphys03atribodefaulthtm
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - - - - + + - - +strong negative charge neutral
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - - - - + + - - +electrons move until they are balanced in both objects
Conductors are materials which allow electrons to flow freely through them
Insulators are materials which do not allow electrons to flow freely
examples examples
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - + + - - - - - +negative charge negative charge
What would happen if a strong positive charge made contact with a neutral object
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
- + - ++ - + -
neutral
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + - - + + - -
separation of charge electrons
are repelled
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
electrons are conducted into the
ground
insulator
The Earth is so big it is always considered neutral
The ground is then disconnected
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
object is left positively charged
insulator
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move Charge is conserved
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
ConductionTransfer of electrons from a charged material to another material through contact
Contact is needed Electrons flow more freely through good conductors There is net flow until there is balance of charge between the two objects
InductionDoes not use contact between two materials but does require one to be grounded
Separation of charge occurs as elecrons can move but protons cannot By cutting the ground the induced object remains charged
Properties of electrostatic charge
Image pithball electroscope from httpenwikipediaorgwikiElectroscope
Observe and explainWool is used to charge an acrylic rod It is brought near the neutral pithball attracting it
It touches the pithball after which it is repelled Why does this happen
Which force is stronger ndash the electromagnetic force or gravity Explain your reasoning
lsquoLikersquo charges repel lsquoOppositersquo charges attractOnly electrons have the freedom to move through a material
Build your own simple electroscope
Image simple electroscope from httpenwikipediaorgwikiElectrometer
What materials do you need
Test it and get some photos- in the resting state- when approached by a negatively
charged object- when approached by a positively
charged object
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
- - - - - - - -
- - - -
+
++
-- -
-
Negatively charged rod
Negatively charged leaves
Induced charge separation- electrons in the rod repel electrons
in the electroscope- electrons are forced into the leaves- negatively charged leaves repel
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
+ + + + + +
- -- -
+++
- ---
Positively charged rod
Positively charged leaves
Induced charge separation- protons in the rod attract electrons in
the electroscope- electrons move away from the leaves- positively charged leaves repel
Can we measure charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
How could we use an electroscope to measure the charge of an object
Properties of Charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Charge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
Electrostatic discharges
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Explain what is happening in these animations They are different
httpphetcoloradoeduensimulationtravoltage httpregentspreporgRegentsphysicsphys03atribo
What environmental conditions favour static shocks What can you do to reduce the chance of getting a static shock
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Can you explain whatrsquos happeningTry this visualisation from PhET Labs httpphetcoloradoeduensimulationballoons
Find out more about the triboelectric series
Do electrons move from the balloon to the jumper or the other way round ndash why
Image simple electroscope from httpwwwschool-for-championscomsciencestatic_detectionhtm
What is happening in the electroscope
What happens when the leaves get lsquostuckrsquo apart
How could you get them to go back to their original positions Why does this work
Properties of ChargeCharge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
neutral
strong negative charge
weak positive charge
Add electrons to each of these systems
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
Properties of ChargeCharge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
neutral
strong negative charge
weak positive charge
Add electrons to each of these systems
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
- - - - - - - - - -
- - - - -
- - - - - - - - -- -- -
-- - - - - - -
Remember electrons can be added or removed but
protons stay where they are
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move
httpphetcoloradoeduensimulationballoons
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
Triboelectric series
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
What happens whenhellip1 Aluminium is rubbed against human hair2 Fur is rubbed against styrofoam3 Teflon is rubbed against styrofoam4 Dry hands are rubbed against polyethylene
Where do leather nylon polyester and hard rubber fit on the series
Find out more httpregentspreporgRegentsphysicsphys03atribodefaulthtm
Triboelectric series
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
What happens whenhellip1 Aluminium is rubbed against human hair2 Fur is rubbed against styrofoam3 Teflon is rubbed against styrofoam4 Dry hands are rubbed against polyethylene
Where do leather nylon polyester and hard rubber fit on the series
leather nylonpolyester
hard rubber
Find out more httpregentspreporgRegentsphysicsphys03atribodefaulthtm
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - - - - + + - - +strong negative charge neutral
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - - - - + + - - +electrons move until they are balanced in both objects
Conductors are materials which allow electrons to flow freely through them
Insulators are materials which do not allow electrons to flow freely
examples examples
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - + + - - - - - +negative charge negative charge
What would happen if a strong positive charge made contact with a neutral object
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
- + - ++ - + -
neutral
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + - - + + - -
separation of charge electrons
are repelled
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
electrons are conducted into the
ground
insulator
The Earth is so big it is always considered neutral
The ground is then disconnected
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
object is left positively charged
insulator
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move Charge is conserved
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
ConductionTransfer of electrons from a charged material to another material through contact
Contact is needed Electrons flow more freely through good conductors There is net flow until there is balance of charge between the two objects
InductionDoes not use contact between two materials but does require one to be grounded
Separation of charge occurs as elecrons can move but protons cannot By cutting the ground the induced object remains charged
Properties of electrostatic charge
Image pithball electroscope from httpenwikipediaorgwikiElectroscope
Observe and explainWool is used to charge an acrylic rod It is brought near the neutral pithball attracting it
It touches the pithball after which it is repelled Why does this happen
Which force is stronger ndash the electromagnetic force or gravity Explain your reasoning
lsquoLikersquo charges repel lsquoOppositersquo charges attractOnly electrons have the freedom to move through a material
Build your own simple electroscope
Image simple electroscope from httpenwikipediaorgwikiElectrometer
What materials do you need
Test it and get some photos- in the resting state- when approached by a negatively
charged object- when approached by a positively
charged object
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
- - - - - - - -
- - - -
+
++
-- -
-
Negatively charged rod
Negatively charged leaves
Induced charge separation- electrons in the rod repel electrons
in the electroscope- electrons are forced into the leaves- negatively charged leaves repel
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
+ + + + + +
- -- -
+++
- ---
Positively charged rod
Positively charged leaves
Induced charge separation- protons in the rod attract electrons in
the electroscope- electrons move away from the leaves- positively charged leaves repel
Can we measure charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
How could we use an electroscope to measure the charge of an object
Properties of Charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Charge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
Electrostatic discharges
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Explain what is happening in these animations They are different
httpphetcoloradoeduensimulationtravoltage httpregentspreporgRegentsphysicsphys03atribo
What environmental conditions favour static shocks What can you do to reduce the chance of getting a static shock
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Properties of ChargeCharge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
neutral
strong negative charge
weak positive charge
Add electrons to each of these systems
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
Properties of ChargeCharge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
neutral
strong negative charge
weak positive charge
Add electrons to each of these systems
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
- - - - - - - - - -
- - - - -
- - - - - - - - -- -- -
-- - - - - - -
Remember electrons can be added or removed but
protons stay where they are
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move
httpphetcoloradoeduensimulationballoons
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
Triboelectric series
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
What happens whenhellip1 Aluminium is rubbed against human hair2 Fur is rubbed against styrofoam3 Teflon is rubbed against styrofoam4 Dry hands are rubbed against polyethylene
Where do leather nylon polyester and hard rubber fit on the series
Find out more httpregentspreporgRegentsphysicsphys03atribodefaulthtm
Triboelectric series
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
What happens whenhellip1 Aluminium is rubbed against human hair2 Fur is rubbed against styrofoam3 Teflon is rubbed against styrofoam4 Dry hands are rubbed against polyethylene
Where do leather nylon polyester and hard rubber fit on the series
leather nylonpolyester
hard rubber
Find out more httpregentspreporgRegentsphysicsphys03atribodefaulthtm
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - - - - + + - - +strong negative charge neutral
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - - - - + + - - +electrons move until they are balanced in both objects
Conductors are materials which allow electrons to flow freely through them
Insulators are materials which do not allow electrons to flow freely
examples examples
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - + + - - - - - +negative charge negative charge
What would happen if a strong positive charge made contact with a neutral object
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
- + - ++ - + -
neutral
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + - - + + - -
separation of charge electrons
are repelled
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
electrons are conducted into the
ground
insulator
The Earth is so big it is always considered neutral
The ground is then disconnected
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
object is left positively charged
insulator
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move Charge is conserved
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
ConductionTransfer of electrons from a charged material to another material through contact
Contact is needed Electrons flow more freely through good conductors There is net flow until there is balance of charge between the two objects
InductionDoes not use contact between two materials but does require one to be grounded
Separation of charge occurs as elecrons can move but protons cannot By cutting the ground the induced object remains charged
Properties of electrostatic charge
Image pithball electroscope from httpenwikipediaorgwikiElectroscope
Observe and explainWool is used to charge an acrylic rod It is brought near the neutral pithball attracting it
It touches the pithball after which it is repelled Why does this happen
Which force is stronger ndash the electromagnetic force or gravity Explain your reasoning
lsquoLikersquo charges repel lsquoOppositersquo charges attractOnly electrons have the freedom to move through a material
Build your own simple electroscope
Image simple electroscope from httpenwikipediaorgwikiElectrometer
What materials do you need
Test it and get some photos- in the resting state- when approached by a negatively
charged object- when approached by a positively
charged object
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
- - - - - - - -
- - - -
+
++
-- -
-
Negatively charged rod
Negatively charged leaves
Induced charge separation- electrons in the rod repel electrons
in the electroscope- electrons are forced into the leaves- negatively charged leaves repel
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
+ + + + + +
- -- -
+++
- ---
Positively charged rod
Positively charged leaves
Induced charge separation- protons in the rod attract electrons in
the electroscope- electrons move away from the leaves- positively charged leaves repel
Can we measure charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
How could we use an electroscope to measure the charge of an object
Properties of Charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Charge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
Electrostatic discharges
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Explain what is happening in these animations They are different
httpphetcoloradoeduensimulationtravoltage httpregentspreporgRegentsphysicsphys03atribo
What environmental conditions favour static shocks What can you do to reduce the chance of getting a static shock
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Properties of ChargeCharge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
neutral
strong negative charge
weak positive charge
Add electrons to each of these systems
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
+ + + +
+ + ++ + +
- - - - - - - - - -
- - - - -
- - - - - - - - -- -- -
-- - - - - - -
Remember electrons can be added or removed but
protons stay where they are
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move
httpphetcoloradoeduensimulationballoons
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
Triboelectric series
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
What happens whenhellip1 Aluminium is rubbed against human hair2 Fur is rubbed against styrofoam3 Teflon is rubbed against styrofoam4 Dry hands are rubbed against polyethylene
Where do leather nylon polyester and hard rubber fit on the series
Find out more httpregentspreporgRegentsphysicsphys03atribodefaulthtm
Triboelectric series
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
What happens whenhellip1 Aluminium is rubbed against human hair2 Fur is rubbed against styrofoam3 Teflon is rubbed against styrofoam4 Dry hands are rubbed against polyethylene
Where do leather nylon polyester and hard rubber fit on the series
leather nylonpolyester
hard rubber
Find out more httpregentspreporgRegentsphysicsphys03atribodefaulthtm
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - - - - + + - - +strong negative charge neutral
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - - - - + + - - +electrons move until they are balanced in both objects
Conductors are materials which allow electrons to flow freely through them
Insulators are materials which do not allow electrons to flow freely
examples examples
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - + + - - - - - +negative charge negative charge
What would happen if a strong positive charge made contact with a neutral object
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
- + - ++ - + -
neutral
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + - - + + - -
separation of charge electrons
are repelled
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
electrons are conducted into the
ground
insulator
The Earth is so big it is always considered neutral
The ground is then disconnected
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
object is left positively charged
insulator
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move Charge is conserved
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
ConductionTransfer of electrons from a charged material to another material through contact
Contact is needed Electrons flow more freely through good conductors There is net flow until there is balance of charge between the two objects
InductionDoes not use contact between two materials but does require one to be grounded
Separation of charge occurs as elecrons can move but protons cannot By cutting the ground the induced object remains charged
Properties of electrostatic charge
Image pithball electroscope from httpenwikipediaorgwikiElectroscope
Observe and explainWool is used to charge an acrylic rod It is brought near the neutral pithball attracting it
It touches the pithball after which it is repelled Why does this happen
Which force is stronger ndash the electromagnetic force or gravity Explain your reasoning
lsquoLikersquo charges repel lsquoOppositersquo charges attractOnly electrons have the freedom to move through a material
Build your own simple electroscope
Image simple electroscope from httpenwikipediaorgwikiElectrometer
What materials do you need
Test it and get some photos- in the resting state- when approached by a negatively
charged object- when approached by a positively
charged object
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
- - - - - - - -
- - - -
+
++
-- -
-
Negatively charged rod
Negatively charged leaves
Induced charge separation- electrons in the rod repel electrons
in the electroscope- electrons are forced into the leaves- negatively charged leaves repel
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
+ + + + + +
- -- -
+++
- ---
Positively charged rod
Positively charged leaves
Induced charge separation- protons in the rod attract electrons in
the electroscope- electrons move away from the leaves- positively charged leaves repel
Can we measure charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
How could we use an electroscope to measure the charge of an object
Properties of Charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Charge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
Electrostatic discharges
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Explain what is happening in these animations They are different
httpphetcoloradoeduensimulationtravoltage httpregentspreporgRegentsphysicsphys03atribo
What environmental conditions favour static shocks What can you do to reduce the chance of getting a static shock
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move
httpphetcoloradoeduensimulationballoons
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
Triboelectric series
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
What happens whenhellip1 Aluminium is rubbed against human hair2 Fur is rubbed against styrofoam3 Teflon is rubbed against styrofoam4 Dry hands are rubbed against polyethylene
Where do leather nylon polyester and hard rubber fit on the series
Find out more httpregentspreporgRegentsphysicsphys03atribodefaulthtm
Triboelectric series
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
What happens whenhellip1 Aluminium is rubbed against human hair2 Fur is rubbed against styrofoam3 Teflon is rubbed against styrofoam4 Dry hands are rubbed against polyethylene
Where do leather nylon polyester and hard rubber fit on the series
leather nylonpolyester
hard rubber
Find out more httpregentspreporgRegentsphysicsphys03atribodefaulthtm
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - - - - + + - - +strong negative charge neutral
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - - - - + + - - +electrons move until they are balanced in both objects
Conductors are materials which allow electrons to flow freely through them
Insulators are materials which do not allow electrons to flow freely
examples examples
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - + + - - - - - +negative charge negative charge
What would happen if a strong positive charge made contact with a neutral object
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
- + - ++ - + -
neutral
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + - - + + - -
separation of charge electrons
are repelled
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
electrons are conducted into the
ground
insulator
The Earth is so big it is always considered neutral
The ground is then disconnected
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
object is left positively charged
insulator
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move Charge is conserved
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
ConductionTransfer of electrons from a charged material to another material through contact
Contact is needed Electrons flow more freely through good conductors There is net flow until there is balance of charge between the two objects
InductionDoes not use contact between two materials but does require one to be grounded
Separation of charge occurs as elecrons can move but protons cannot By cutting the ground the induced object remains charged
Properties of electrostatic charge
Image pithball electroscope from httpenwikipediaorgwikiElectroscope
Observe and explainWool is used to charge an acrylic rod It is brought near the neutral pithball attracting it
It touches the pithball after which it is repelled Why does this happen
Which force is stronger ndash the electromagnetic force or gravity Explain your reasoning
lsquoLikersquo charges repel lsquoOppositersquo charges attractOnly electrons have the freedom to move through a material
Build your own simple electroscope
Image simple electroscope from httpenwikipediaorgwikiElectrometer
What materials do you need
Test it and get some photos- in the resting state- when approached by a negatively
charged object- when approached by a positively
charged object
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
- - - - - - - -
- - - -
+
++
-- -
-
Negatively charged rod
Negatively charged leaves
Induced charge separation- electrons in the rod repel electrons
in the electroscope- electrons are forced into the leaves- negatively charged leaves repel
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
+ + + + + +
- -- -
+++
- ---
Positively charged rod
Positively charged leaves
Induced charge separation- protons in the rod attract electrons in
the electroscope- electrons move away from the leaves- positively charged leaves repel
Can we measure charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
How could we use an electroscope to measure the charge of an object
Properties of Charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Charge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
Electrostatic discharges
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Explain what is happening in these animations They are different
httpphetcoloradoeduensimulationtravoltage httpregentspreporgRegentsphysicsphys03atribo
What environmental conditions favour static shocks What can you do to reduce the chance of getting a static shock
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Triboelectric series
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
What happens whenhellip1 Aluminium is rubbed against human hair2 Fur is rubbed against styrofoam3 Teflon is rubbed against styrofoam4 Dry hands are rubbed against polyethylene
Where do leather nylon polyester and hard rubber fit on the series
Find out more httpregentspreporgRegentsphysicsphys03atribodefaulthtm
Triboelectric series
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
What happens whenhellip1 Aluminium is rubbed against human hair2 Fur is rubbed against styrofoam3 Teflon is rubbed against styrofoam4 Dry hands are rubbed against polyethylene
Where do leather nylon polyester and hard rubber fit on the series
leather nylonpolyester
hard rubber
Find out more httpregentspreporgRegentsphysicsphys03atribodefaulthtm
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - - - - + + - - +strong negative charge neutral
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - - - - + + - - +electrons move until they are balanced in both objects
Conductors are materials which allow electrons to flow freely through them
Insulators are materials which do not allow electrons to flow freely
examples examples
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - + + - - - - - +negative charge negative charge
What would happen if a strong positive charge made contact with a neutral object
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
- + - ++ - + -
neutral
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + - - + + - -
separation of charge electrons
are repelled
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
electrons are conducted into the
ground
insulator
The Earth is so big it is always considered neutral
The ground is then disconnected
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
object is left positively charged
insulator
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move Charge is conserved
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
ConductionTransfer of electrons from a charged material to another material through contact
Contact is needed Electrons flow more freely through good conductors There is net flow until there is balance of charge between the two objects
InductionDoes not use contact between two materials but does require one to be grounded
Separation of charge occurs as elecrons can move but protons cannot By cutting the ground the induced object remains charged
Properties of electrostatic charge
Image pithball electroscope from httpenwikipediaorgwikiElectroscope
Observe and explainWool is used to charge an acrylic rod It is brought near the neutral pithball attracting it
It touches the pithball after which it is repelled Why does this happen
Which force is stronger ndash the electromagnetic force or gravity Explain your reasoning
lsquoLikersquo charges repel lsquoOppositersquo charges attractOnly electrons have the freedom to move through a material
Build your own simple electroscope
Image simple electroscope from httpenwikipediaorgwikiElectrometer
What materials do you need
Test it and get some photos- in the resting state- when approached by a negatively
charged object- when approached by a positively
charged object
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
- - - - - - - -
- - - -
+
++
-- -
-
Negatively charged rod
Negatively charged leaves
Induced charge separation- electrons in the rod repel electrons
in the electroscope- electrons are forced into the leaves- negatively charged leaves repel
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
+ + + + + +
- -- -
+++
- ---
Positively charged rod
Positively charged leaves
Induced charge separation- protons in the rod attract electrons in
the electroscope- electrons move away from the leaves- positively charged leaves repel
Can we measure charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
How could we use an electroscope to measure the charge of an object
Properties of Charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Charge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
Electrostatic discharges
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Explain what is happening in these animations They are different
httpphetcoloradoeduensimulationtravoltage httpregentspreporgRegentsphysicsphys03atribo
What environmental conditions favour static shocks What can you do to reduce the chance of getting a static shock
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Triboelectric series
+ -aluminium
styrofoamhuman hair
dry hands
polyethylene (tape)teflon
furglass
electron holderselectron losers
What happens whenhellip1 Aluminium is rubbed against human hair2 Fur is rubbed against styrofoam3 Teflon is rubbed against styrofoam4 Dry hands are rubbed against polyethylene
Where do leather nylon polyester and hard rubber fit on the series
leather nylonpolyester
hard rubber
Find out more httpregentspreporgRegentsphysicsphys03atribodefaulthtm
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - - - - + + - - +strong negative charge neutral
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - - - - + + - - +electrons move until they are balanced in both objects
Conductors are materials which allow electrons to flow freely through them
Insulators are materials which do not allow electrons to flow freely
examples examples
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - + + - - - - - +negative charge negative charge
What would happen if a strong positive charge made contact with a neutral object
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
- + - ++ - + -
neutral
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + - - + + - -
separation of charge electrons
are repelled
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
electrons are conducted into the
ground
insulator
The Earth is so big it is always considered neutral
The ground is then disconnected
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
object is left positively charged
insulator
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move Charge is conserved
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
ConductionTransfer of electrons from a charged material to another material through contact
Contact is needed Electrons flow more freely through good conductors There is net flow until there is balance of charge between the two objects
InductionDoes not use contact between two materials but does require one to be grounded
Separation of charge occurs as elecrons can move but protons cannot By cutting the ground the induced object remains charged
Properties of electrostatic charge
Image pithball electroscope from httpenwikipediaorgwikiElectroscope
Observe and explainWool is used to charge an acrylic rod It is brought near the neutral pithball attracting it
It touches the pithball after which it is repelled Why does this happen
Which force is stronger ndash the electromagnetic force or gravity Explain your reasoning
lsquoLikersquo charges repel lsquoOppositersquo charges attractOnly electrons have the freedom to move through a material
Build your own simple electroscope
Image simple electroscope from httpenwikipediaorgwikiElectrometer
What materials do you need
Test it and get some photos- in the resting state- when approached by a negatively
charged object- when approached by a positively
charged object
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
- - - - - - - -
- - - -
+
++
-- -
-
Negatively charged rod
Negatively charged leaves
Induced charge separation- electrons in the rod repel electrons
in the electroscope- electrons are forced into the leaves- negatively charged leaves repel
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
+ + + + + +
- -- -
+++
- ---
Positively charged rod
Positively charged leaves
Induced charge separation- protons in the rod attract electrons in
the electroscope- electrons move away from the leaves- positively charged leaves repel
Can we measure charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
How could we use an electroscope to measure the charge of an object
Properties of Charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Charge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
Electrostatic discharges
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Explain what is happening in these animations They are different
httpphetcoloradoeduensimulationtravoltage httpregentspreporgRegentsphysicsphys03atribo
What environmental conditions favour static shocks What can you do to reduce the chance of getting a static shock
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - - - - + + - - +strong negative charge neutral
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - - - - + + - - +electrons move until they are balanced in both objects
Conductors are materials which allow electrons to flow freely through them
Insulators are materials which do not allow electrons to flow freely
examples examples
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - + + - - - - - +negative charge negative charge
What would happen if a strong positive charge made contact with a neutral object
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
- + - ++ - + -
neutral
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + - - + + - -
separation of charge electrons
are repelled
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
electrons are conducted into the
ground
insulator
The Earth is so big it is always considered neutral
The ground is then disconnected
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
object is left positively charged
insulator
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move Charge is conserved
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
ConductionTransfer of electrons from a charged material to another material through contact
Contact is needed Electrons flow more freely through good conductors There is net flow until there is balance of charge between the two objects
InductionDoes not use contact between two materials but does require one to be grounded
Separation of charge occurs as elecrons can move but protons cannot By cutting the ground the induced object remains charged
Properties of electrostatic charge
Image pithball electroscope from httpenwikipediaorgwikiElectroscope
Observe and explainWool is used to charge an acrylic rod It is brought near the neutral pithball attracting it
It touches the pithball after which it is repelled Why does this happen
Which force is stronger ndash the electromagnetic force or gravity Explain your reasoning
lsquoLikersquo charges repel lsquoOppositersquo charges attractOnly electrons have the freedom to move through a material
Build your own simple electroscope
Image simple electroscope from httpenwikipediaorgwikiElectrometer
What materials do you need
Test it and get some photos- in the resting state- when approached by a negatively
charged object- when approached by a positively
charged object
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
- - - - - - - -
- - - -
+
++
-- -
-
Negatively charged rod
Negatively charged leaves
Induced charge separation- electrons in the rod repel electrons
in the electroscope- electrons are forced into the leaves- negatively charged leaves repel
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
+ + + + + +
- -- -
+++
- ---
Positively charged rod
Positively charged leaves
Induced charge separation- protons in the rod attract electrons in
the electroscope- electrons move away from the leaves- positively charged leaves repel
Can we measure charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
How could we use an electroscope to measure the charge of an object
Properties of Charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Charge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
Electrostatic discharges
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Explain what is happening in these animations They are different
httpphetcoloradoeduensimulationtravoltage httpregentspreporgRegentsphysicsphys03atribo
What environmental conditions favour static shocks What can you do to reduce the chance of getting a static shock
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - - - - + + - - +electrons move until they are balanced in both objects
Conductors are materials which allow electrons to flow freely through them
Insulators are materials which do not allow electrons to flow freely
examples examples
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - + + - - - - - +negative charge negative charge
What would happen if a strong positive charge made contact with a neutral object
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
- + - ++ - + -
neutral
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + - - + + - -
separation of charge electrons
are repelled
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
electrons are conducted into the
ground
insulator
The Earth is so big it is always considered neutral
The ground is then disconnected
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
object is left positively charged
insulator
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move Charge is conserved
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
ConductionTransfer of electrons from a charged material to another material through contact
Contact is needed Electrons flow more freely through good conductors There is net flow until there is balance of charge between the two objects
InductionDoes not use contact between two materials but does require one to be grounded
Separation of charge occurs as elecrons can move but protons cannot By cutting the ground the induced object remains charged
Properties of electrostatic charge
Image pithball electroscope from httpenwikipediaorgwikiElectroscope
Observe and explainWool is used to charge an acrylic rod It is brought near the neutral pithball attracting it
It touches the pithball after which it is repelled Why does this happen
Which force is stronger ndash the electromagnetic force or gravity Explain your reasoning
lsquoLikersquo charges repel lsquoOppositersquo charges attractOnly electrons have the freedom to move through a material
Build your own simple electroscope
Image simple electroscope from httpenwikipediaorgwikiElectrometer
What materials do you need
Test it and get some photos- in the resting state- when approached by a negatively
charged object- when approached by a positively
charged object
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
- - - - - - - -
- - - -
+
++
-- -
-
Negatively charged rod
Negatively charged leaves
Induced charge separation- electrons in the rod repel electrons
in the electroscope- electrons are forced into the leaves- negatively charged leaves repel
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
+ + + + + +
- -- -
+++
- ---
Positively charged rod
Positively charged leaves
Induced charge separation- protons in the rod attract electrons in
the electroscope- electrons move away from the leaves- positively charged leaves repel
Can we measure charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
How could we use an electroscope to measure the charge of an object
Properties of Charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Charge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
Electrostatic discharges
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Explain what is happening in these animations They are different
httpphetcoloradoeduensimulationtravoltage httpregentspreporgRegentsphysicsphys03atribo
What environmental conditions favour static shocks What can you do to reduce the chance of getting a static shock
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Methods of generating a static chargeOnly electrons move
ConductionTransfer of electrons from a charged material to another material through contact
+ - - - - - + + - - - - - +negative charge negative charge
What would happen if a strong positive charge made contact with a neutral object
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
- + - ++ - + -
neutral
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + - - + + - -
separation of charge electrons
are repelled
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
electrons are conducted into the
ground
insulator
The Earth is so big it is always considered neutral
The ground is then disconnected
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
object is left positively charged
insulator
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move Charge is conserved
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
ConductionTransfer of electrons from a charged material to another material through contact
Contact is needed Electrons flow more freely through good conductors There is net flow until there is balance of charge between the two objects
InductionDoes not use contact between two materials but does require one to be grounded
Separation of charge occurs as elecrons can move but protons cannot By cutting the ground the induced object remains charged
Properties of electrostatic charge
Image pithball electroscope from httpenwikipediaorgwikiElectroscope
Observe and explainWool is used to charge an acrylic rod It is brought near the neutral pithball attracting it
It touches the pithball after which it is repelled Why does this happen
Which force is stronger ndash the electromagnetic force or gravity Explain your reasoning
lsquoLikersquo charges repel lsquoOppositersquo charges attractOnly electrons have the freedom to move through a material
Build your own simple electroscope
Image simple electroscope from httpenwikipediaorgwikiElectrometer
What materials do you need
Test it and get some photos- in the resting state- when approached by a negatively
charged object- when approached by a positively
charged object
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
- - - - - - - -
- - - -
+
++
-- -
-
Negatively charged rod
Negatively charged leaves
Induced charge separation- electrons in the rod repel electrons
in the electroscope- electrons are forced into the leaves- negatively charged leaves repel
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
+ + + + + +
- -- -
+++
- ---
Positively charged rod
Positively charged leaves
Induced charge separation- protons in the rod attract electrons in
the electroscope- electrons move away from the leaves- positively charged leaves repel
Can we measure charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
How could we use an electroscope to measure the charge of an object
Properties of Charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Charge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
Electrostatic discharges
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Explain what is happening in these animations They are different
httpphetcoloradoeduensimulationtravoltage httpregentspreporgRegentsphysicsphys03atribo
What environmental conditions favour static shocks What can you do to reduce the chance of getting a static shock
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
- + - ++ - + -
neutral
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + - - + + - -
separation of charge electrons
are repelled
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
electrons are conducted into the
ground
insulator
The Earth is so big it is always considered neutral
The ground is then disconnected
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
object is left positively charged
insulator
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move Charge is conserved
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
ConductionTransfer of electrons from a charged material to another material through contact
Contact is needed Electrons flow more freely through good conductors There is net flow until there is balance of charge between the two objects
InductionDoes not use contact between two materials but does require one to be grounded
Separation of charge occurs as elecrons can move but protons cannot By cutting the ground the induced object remains charged
Properties of electrostatic charge
Image pithball electroscope from httpenwikipediaorgwikiElectroscope
Observe and explainWool is used to charge an acrylic rod It is brought near the neutral pithball attracting it
It touches the pithball after which it is repelled Why does this happen
Which force is stronger ndash the electromagnetic force or gravity Explain your reasoning
lsquoLikersquo charges repel lsquoOppositersquo charges attractOnly electrons have the freedom to move through a material
Build your own simple electroscope
Image simple electroscope from httpenwikipediaorgwikiElectrometer
What materials do you need
Test it and get some photos- in the resting state- when approached by a negatively
charged object- when approached by a positively
charged object
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
- - - - - - - -
- - - -
+
++
-- -
-
Negatively charged rod
Negatively charged leaves
Induced charge separation- electrons in the rod repel electrons
in the electroscope- electrons are forced into the leaves- negatively charged leaves repel
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
+ + + + + +
- -- -
+++
- ---
Positively charged rod
Positively charged leaves
Induced charge separation- protons in the rod attract electrons in
the electroscope- electrons move away from the leaves- positively charged leaves repel
Can we measure charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
How could we use an electroscope to measure the charge of an object
Properties of Charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Charge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
Electrostatic discharges
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Explain what is happening in these animations They are different
httpphetcoloradoeduensimulationtravoltage httpregentspreporgRegentsphysicsphys03atribo
What environmental conditions favour static shocks What can you do to reduce the chance of getting a static shock
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + - - + + - -
separation of charge electrons
are repelled
insulator
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
electrons are conducted into the
ground
insulator
The Earth is so big it is always considered neutral
The ground is then disconnected
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
object is left positively charged
insulator
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move Charge is conserved
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
ConductionTransfer of electrons from a charged material to another material through contact
Contact is needed Electrons flow more freely through good conductors There is net flow until there is balance of charge between the two objects
InductionDoes not use contact between two materials but does require one to be grounded
Separation of charge occurs as elecrons can move but protons cannot By cutting the ground the induced object remains charged
Properties of electrostatic charge
Image pithball electroscope from httpenwikipediaorgwikiElectroscope
Observe and explainWool is used to charge an acrylic rod It is brought near the neutral pithball attracting it
It touches the pithball after which it is repelled Why does this happen
Which force is stronger ndash the electromagnetic force or gravity Explain your reasoning
lsquoLikersquo charges repel lsquoOppositersquo charges attractOnly electrons have the freedom to move through a material
Build your own simple electroscope
Image simple electroscope from httpenwikipediaorgwikiElectrometer
What materials do you need
Test it and get some photos- in the resting state- when approached by a negatively
charged object- when approached by a positively
charged object
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
- - - - - - - -
- - - -
+
++
-- -
-
Negatively charged rod
Negatively charged leaves
Induced charge separation- electrons in the rod repel electrons
in the electroscope- electrons are forced into the leaves- negatively charged leaves repel
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
+ + + + + +
- -- -
+++
- ---
Positively charged rod
Positively charged leaves
Induced charge separation- protons in the rod attract electrons in
the electroscope- electrons move away from the leaves- positively charged leaves repel
Can we measure charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
How could we use an electroscope to measure the charge of an object
Properties of Charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Charge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
Electrostatic discharges
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Explain what is happening in these animations They are different
httpphetcoloradoeduensimulationtravoltage httpregentspreporgRegentsphysicsphys03atribo
What environmental conditions favour static shocks What can you do to reduce the chance of getting a static shock
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
electrons are conducted into the
ground
insulator
The Earth is so big it is always considered neutral
The ground is then disconnected
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
object is left positively charged
insulator
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move Charge is conserved
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
ConductionTransfer of electrons from a charged material to another material through contact
Contact is needed Electrons flow more freely through good conductors There is net flow until there is balance of charge between the two objects
InductionDoes not use contact between two materials but does require one to be grounded
Separation of charge occurs as elecrons can move but protons cannot By cutting the ground the induced object remains charged
Properties of electrostatic charge
Image pithball electroscope from httpenwikipediaorgwikiElectroscope
Observe and explainWool is used to charge an acrylic rod It is brought near the neutral pithball attracting it
It touches the pithball after which it is repelled Why does this happen
Which force is stronger ndash the electromagnetic force or gravity Explain your reasoning
lsquoLikersquo charges repel lsquoOppositersquo charges attractOnly electrons have the freedom to move through a material
Build your own simple electroscope
Image simple electroscope from httpenwikipediaorgwikiElectrometer
What materials do you need
Test it and get some photos- in the resting state- when approached by a negatively
charged object- when approached by a positively
charged object
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
- - - - - - - -
- - - -
+
++
-- -
-
Negatively charged rod
Negatively charged leaves
Induced charge separation- electrons in the rod repel electrons
in the electroscope- electrons are forced into the leaves- negatively charged leaves repel
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
+ + + + + +
- -- -
+++
- ---
Positively charged rod
Positively charged leaves
Induced charge separation- protons in the rod attract electrons in
the electroscope- electrons move away from the leaves- positively charged leaves repel
Can we measure charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
How could we use an electroscope to measure the charge of an object
Properties of Charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Charge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
Electrostatic discharges
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Explain what is happening in these animations They are different
httpphetcoloradoeduensimulationtravoltage httpregentspreporgRegentsphysicsphys03atribo
What environmental conditions favour static shocks What can you do to reduce the chance of getting a static shock
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Methods of generating a static charge
InductionDoes not use contact between two materials but does require one to be grounded
+ - - - - - - - - +strong negative charge
+ + + +
object is left positively charged
insulator
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move Charge is conserved
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
ConductionTransfer of electrons from a charged material to another material through contact
Contact is needed Electrons flow more freely through good conductors There is net flow until there is balance of charge between the two objects
InductionDoes not use contact between two materials but does require one to be grounded
Separation of charge occurs as elecrons can move but protons cannot By cutting the ground the induced object remains charged
Properties of electrostatic charge
Image pithball electroscope from httpenwikipediaorgwikiElectroscope
Observe and explainWool is used to charge an acrylic rod It is brought near the neutral pithball attracting it
It touches the pithball after which it is repelled Why does this happen
Which force is stronger ndash the electromagnetic force or gravity Explain your reasoning
lsquoLikersquo charges repel lsquoOppositersquo charges attractOnly electrons have the freedom to move through a material
Build your own simple electroscope
Image simple electroscope from httpenwikipediaorgwikiElectrometer
What materials do you need
Test it and get some photos- in the resting state- when approached by a negatively
charged object- when approached by a positively
charged object
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
- - - - - - - -
- - - -
+
++
-- -
-
Negatively charged rod
Negatively charged leaves
Induced charge separation- electrons in the rod repel electrons
in the electroscope- electrons are forced into the leaves- negatively charged leaves repel
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
+ + + + + +
- -- -
+++
- ---
Positively charged rod
Positively charged leaves
Induced charge separation- protons in the rod attract electrons in
the electroscope- electrons move away from the leaves- positively charged leaves repel
Can we measure charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
How could we use an electroscope to measure the charge of an object
Properties of Charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Charge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
Electrostatic discharges
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Explain what is happening in these animations They are different
httpphetcoloradoeduensimulationtravoltage httpregentspreporgRegentsphysicsphys03atribo
What environmental conditions favour static shocks What can you do to reduce the chance of getting a static shock
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Methods of generating a static charge
FrictionTransfer of electrons from one material to a different one through friction Electrons are lsquopeeledrsquo off one by the other
Only electrons move Charge is conserved
The triboelectric (or electrostatic) series tells us which materials have a greater tendency to hold on to their electrons and which have a greater tendency to lose their electrons
ConductionTransfer of electrons from a charged material to another material through contact
Contact is needed Electrons flow more freely through good conductors There is net flow until there is balance of charge between the two objects
InductionDoes not use contact between two materials but does require one to be grounded
Separation of charge occurs as elecrons can move but protons cannot By cutting the ground the induced object remains charged
Properties of electrostatic charge
Image pithball electroscope from httpenwikipediaorgwikiElectroscope
Observe and explainWool is used to charge an acrylic rod It is brought near the neutral pithball attracting it
It touches the pithball after which it is repelled Why does this happen
Which force is stronger ndash the electromagnetic force or gravity Explain your reasoning
lsquoLikersquo charges repel lsquoOppositersquo charges attractOnly electrons have the freedom to move through a material
Build your own simple electroscope
Image simple electroscope from httpenwikipediaorgwikiElectrometer
What materials do you need
Test it and get some photos- in the resting state- when approached by a negatively
charged object- when approached by a positively
charged object
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
- - - - - - - -
- - - -
+
++
-- -
-
Negatively charged rod
Negatively charged leaves
Induced charge separation- electrons in the rod repel electrons
in the electroscope- electrons are forced into the leaves- negatively charged leaves repel
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
+ + + + + +
- -- -
+++
- ---
Positively charged rod
Positively charged leaves
Induced charge separation- protons in the rod attract electrons in
the electroscope- electrons move away from the leaves- positively charged leaves repel
Can we measure charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
How could we use an electroscope to measure the charge of an object
Properties of Charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Charge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
Electrostatic discharges
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Explain what is happening in these animations They are different
httpphetcoloradoeduensimulationtravoltage httpregentspreporgRegentsphysicsphys03atribo
What environmental conditions favour static shocks What can you do to reduce the chance of getting a static shock
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Properties of electrostatic charge
Image pithball electroscope from httpenwikipediaorgwikiElectroscope
Observe and explainWool is used to charge an acrylic rod It is brought near the neutral pithball attracting it
It touches the pithball after which it is repelled Why does this happen
Which force is stronger ndash the electromagnetic force or gravity Explain your reasoning
lsquoLikersquo charges repel lsquoOppositersquo charges attractOnly electrons have the freedom to move through a material
Build your own simple electroscope
Image simple electroscope from httpenwikipediaorgwikiElectrometer
What materials do you need
Test it and get some photos- in the resting state- when approached by a negatively
charged object- when approached by a positively
charged object
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
- - - - - - - -
- - - -
+
++
-- -
-
Negatively charged rod
Negatively charged leaves
Induced charge separation- electrons in the rod repel electrons
in the electroscope- electrons are forced into the leaves- negatively charged leaves repel
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
+ + + + + +
- -- -
+++
- ---
Positively charged rod
Positively charged leaves
Induced charge separation- protons in the rod attract electrons in
the electroscope- electrons move away from the leaves- positively charged leaves repel
Can we measure charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
How could we use an electroscope to measure the charge of an object
Properties of Charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Charge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
Electrostatic discharges
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Explain what is happening in these animations They are different
httpphetcoloradoeduensimulationtravoltage httpregentspreporgRegentsphysicsphys03atribo
What environmental conditions favour static shocks What can you do to reduce the chance of getting a static shock
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Build your own simple electroscope
Image simple electroscope from httpenwikipediaorgwikiElectrometer
What materials do you need
Test it and get some photos- in the resting state- when approached by a negatively
charged object- when approached by a positively
charged object
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
- - - - - - - -
- - - -
+
++
-- -
-
Negatively charged rod
Negatively charged leaves
Induced charge separation- electrons in the rod repel electrons
in the electroscope- electrons are forced into the leaves- negatively charged leaves repel
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
+ + + + + +
- -- -
+++
- ---
Positively charged rod
Positively charged leaves
Induced charge separation- protons in the rod attract electrons in
the electroscope- electrons move away from the leaves- positively charged leaves repel
Can we measure charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
How could we use an electroscope to measure the charge of an object
Properties of Charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Charge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
Electrostatic discharges
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Explain what is happening in these animations They are different
httpphetcoloradoeduensimulationtravoltage httpregentspreporgRegentsphysicsphys03atribo
What environmental conditions favour static shocks What can you do to reduce the chance of getting a static shock
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
- - - - - - - -
- - - -
+
++
-- -
-
Negatively charged rod
Negatively charged leaves
Induced charge separation- electrons in the rod repel electrons
in the electroscope- electrons are forced into the leaves- negatively charged leaves repel
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
+ + + + + +
- -- -
+++
- ---
Positively charged rod
Positively charged leaves
Induced charge separation- protons in the rod attract electrons in
the electroscope- electrons move away from the leaves- positively charged leaves repel
Can we measure charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
How could we use an electroscope to measure the charge of an object
Properties of Charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Charge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
Electrostatic discharges
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Explain what is happening in these animations They are different
httpphetcoloradoeduensimulationtravoltage httpregentspreporgRegentsphysicsphys03atribo
What environmental conditions favour static shocks What can you do to reduce the chance of getting a static shock
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
How does the electroscope work
Image simple electroscope from httpenwikipediaorgwikiElectrometer
+ + + + + +
- -- -
+++
- ---
Positively charged rod
Positively charged leaves
Induced charge separation- protons in the rod attract electrons in
the electroscope- electrons move away from the leaves- positively charged leaves repel
Can we measure charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
How could we use an electroscope to measure the charge of an object
Properties of Charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Charge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
Electrostatic discharges
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Explain what is happening in these animations They are different
httpphetcoloradoeduensimulationtravoltage httpregentspreporgRegentsphysicsphys03atribo
What environmental conditions favour static shocks What can you do to reduce the chance of getting a static shock
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Can we measure charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
How could we use an electroscope to measure the charge of an object
Properties of Charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Charge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
Electrostatic discharges
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Explain what is happening in these animations They are different
httpphetcoloradoeduensimulationtravoltage httpregentspreporgRegentsphysicsphys03atribo
What environmental conditions favour static shocks What can you do to reduce the chance of getting a static shock
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Properties of Charge
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Charge is conservedCharge cannot be created or destroyed It can only be transferred (by charge carriers)
Charge is quantizedCharge is found in a smallest ldquopackage sizerdquo called the elementary charge e (charge on one proton or electron) measured in Coulombs (C)
electrons
Electrostatic discharges
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Explain what is happening in these animations They are different
httpphetcoloradoeduensimulationtravoltage httpregentspreporgRegentsphysicsphys03atribo
What environmental conditions favour static shocks What can you do to reduce the chance of getting a static shock
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Electrostatic discharges
Image needle electroscope from httpwwwfarraguttncomsciencemilliganAPPhysAElctLabhtm
Explain what is happening in these animations They are different
httpphetcoloradoeduensimulationtravoltage httpregentspreporgRegentsphysicsphys03atribo
What environmental conditions favour static shocks What can you do to reduce the chance of getting a static shock
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
27
What causes lightning
Image AcirciexclRayos httpwwwflickrcomphotos11039104N082926143475
httpwwwyoutubecomwatchv=H_MG__53wsM
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Make some lightningTry this in a darker part of the class Be careful Use the styrofoam and rabbit fur to generate a static charge Touch the aluminium disc against the styrofoam Touch your finger against the disc
What happens when the disc approachesthe electroscope Why
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Little house on the prairie
Image little house from httpwwwsupercoloringcompageslittle-house-in-ukraine
This little house is exposed and prone to being struck by lightning Explain why ndash and then explain why the owners should install a lightning rod
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Be safe at the petrol pumpWatch this video and suggest what could have happened What types of electrostatic transfers took place
httpwwwyoutubecomwatchv=tuZxFL9cGkI
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
What do the Mythbusters say about it
httpwwwyoutubecomwatchv=uw6-PhvcS3M
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Be safe at the petrol pumpThis guy is trying to bring leather pants back into fashion He also loves hairspray and his boots with thick rubber soles
What advice would you give him when he goes to the gas station in his super-cool Lada Samara with polyester seating
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Are cell phones dangerous at petrol pumps
httpwwwyoutubecomwatchv=QkJdaU92Ln8
Donrsquot risk it ndash follow the rules
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Is this plausible Could you really cook an egg with one finger
httpwwwyoutubecomwatchv=QT789U0Ld60
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Is this plausible Could you really power a house with static electricity
httpwwwyoutubecomwatchv=scUosAkxlvo
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Current Electricity Construct and explain
httpphetcoloradoeduensimulationcircuit-construction-kit-ac-virtual-lab
Build circuits using this simulation and try to replicate them with the materials in the lab Use the battery (DC) only
Download and edit the Current Electricity presentation above Complete the questions in the presentation and submit
httpwwwslidesharenetgurustipcurrent-electricity-11092690
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Why does the bulb glowThis cross-section models the flow of electrons through alamp The large dots represent atoms in the filament Open the animation and find out
1 What do the red dots and the small yellow dots represent
2 As the current increases what happens toa The flow of electronsb The rate of collisions with the filament atomsc The energy carried by the flowing electrons
The resistance of the filament remains constant
If it were replaced with a bulb of greater resistance would the bulb glow brighter dimmer or stay the same Explain why
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Resistance Note in this example that the large yellow dots remain constant These are atoms in the filament which impede the flow of the electrons ndash they cause resistance to the current
Some materials have greater electrical resistance than others
Wires have resistance though this is not apparent in the simulations we have used
Resistance can be increased bybull Heating the wire or resistor (atoms vibrate more and so are more likely to impede the flow of electrons)bull Making the wire thinnerbull Making the wire longer
Resistance at the Molecular Levelhttpmicromagnetfsueduelectromagjavafilamentresistance
Increasing the resistance of a bulb does not make it brighter Remember that electrons are flowing round the whole circuit An increase in resistance slows the flow of electrons and the bulb is dimmer
Energy-efficient bulbs have lower resistance than other bulbs due to the materials they are made from
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
40
=VR
A
VΩ
I
Arrange this equation based on your own observations
current
potential difference
resistance
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
41
= VRcurrent
potential difference
resistance
A
V
Ω
IArrange this equation based on your own observations
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Electrical Misconceptions
A used battery weighs less than a new battery because it has
used up all its charge
A used battery weighs less than a new battery because it has lost its
electrons
A used battery does not weigh less than a lsquofullrsquo
battery
Image from httpwwwedupicscomimage-battery-i10096html
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Electrical Misconceptions
The electrons move quickly but bulb A is closer to the battery so will light up first
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Electrical Misconceptions
Bulb C is closer to the negative terminal of the battery so it will get the electrons first and will glow more brightly Bulb B will be
dimmer and A will be dimmest
A B C
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Electrical Misconceptions
The current that returns to the battery is almost zero because most of the current
has been used by the bulbs
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Electrical Misconceptions
The bulb has burned out If I replace it with a bulb of different
resistance it will be the same brightness This is because the battery is the same
Clipart people from httpwwwclkercomsearchkrug1
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Electrical Misconceptions
If I add bulb X to my circuit it will only affect the brightness of bulb B
A B C
XClipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
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- Slide 11
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-
Electricity amp Magnetism ndash whatrsquos the link
When I bring a disconnected wire close to the compasshellip
When I bring a connected wire close to the compasshellip
Clipart people from httpwwwclkercomsearchkrug1
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
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- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
Electricity amp Magnetism ndash whatrsquos the link
If the current affects the compass do magnets affect current
Clipart people from httpwwwclkercomsearchkrug1
Have a go at this PhET Lab to explain the relationship between magnetism and current
How do we generate the electricity we use
PhET Lab Faradayrsquos Electromagnetic Experimenthttpphetcoloradoeduensimulationfaraday
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
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- Slide 47
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- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
How is electrical current generated
Hand generator from httpwwwusiedustemEquipment_pageasp
What happens when you rotate the handle with constant motion and speed up or slow down Why
What happens when you move the handle back and forth Why
What feels different when you connect and disconnect the bulb Why
Connect up some series circuits like you have created in the lsquoCurrent Electricityrsquo tasks Do the same rules appear to be true
What happens if you connect a second hand-generator to the circuit and let it go (Donrsquot grab the handles of both at the same time)
Whatrsquos happening in here
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
- Slide 13
- Slide 14
- Slide 15
- Slide 16
- Slide 17
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- Slide 51
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- Slide 53
- Slide 54
- Slide 55
-
51
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
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- Slide 40
- Slide 41
- Slide 42
- Slide 43
- Slide 44
- Slide 45
- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
52
Renewable vs Non-renewable energyExplain the problems we face in the world regarding energy use
With a partner and a GoogleDoc or whiteboard find out about two forms of generating electricity one based on combustion of fossil fuels and one renewable
Thinking from a One World perspective compare the two methods bull What are the pros and cons of each bull How do they workbull To what extent is the renewable source a viable alternative to the fossil-
fuel based source What directions could Japan take to ensure a sustainable source of electricity
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
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- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
What do you think
Clipart people from httpwwwclkercomsearchkrug1
Ideas based on
Concept Cartoonshttpwwwconceptcartoonscom
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
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- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
+ - + -
cell batterywire
junction
bulb lamp
cathode anode
switch
resistor
V A
voltmeter ammeter
Some basic circuit symbolsYou can use these to build the circuits on the next slides
What do these two components measure
electron flow
conventional current
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
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- Slide 46
- Slide 47
- Slide 48
- Slide 49
- Slide 50
- Slide 51
- Slide 52
- Slide 53
- Slide 54
- Slide 55
-
For more resources
This is a Creative Commons presentation It may be linked and embedded but not sold or re-hosted
Please consider a donation to charity via Biology4GoodClick here for more information about Biology4Good charity donations
- Electricity
- Slide 2
- Slide 3
- Slide 4
- Slide 5
- Slide 6
- Slide 7
- Slide 8
- Slide 9
- Slide 10
- Slide 11
- Slide 12
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