ELECTRICITY What would life be like without electricity? List 4 things that you would miss the most: 1) ______________________________ 2) ______________________________ 3) ______________________________
Jan 14, 2016
ELECTRICITY
What would life be like without electricity?
List 4 things that you would miss the most: 1) ______________________________ 2) ______________________________ 3) ______________________________ 4) ______________________________
Electricity: Electrical Current
Electricity
StaticStatic Is stationaryIs stationary
E.g. E.g. Brush your hairBrush your hair
Wool socks in Wool socks in tumble driertumble drier
CurrentCurrent Flows around circuitFlows around circuit
E.g. E.g. turn on lightturn on light
WalkmanWalkman
Electricity occurs in 2 different forms
Electrical Charge
Review:What is inside the atom?
The atom is made of 3 kinds of particles.The atom is made of 3 kinds of particles.
The electronThe electron
The protonThe proton
The neutronThe neutron
Electric fields surround every charge and can act upon other objects (even without touching them)
The force created by this field can either attract or repel
Electric Charge
There are two types of charge: There are two types of charge: positivepositive and and negativenegative. .
Like charges Like charges repelrepel. . Unlike charges Unlike charges attractattract. . Charge is never created or destroyed.Charge is never created or destroyed.Charge is formed because a Charge is formed because a transfer transfer
of of electronselectrons. .
The Atom
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Neutral Object
Negatively Charged Object
Positively Charged Object
How Do They Become Charged?
ContactContact
Electrons getElectrons get
passed from onepassed from one
object to the otherobject to the other
when they touchwhen they touch
InductionInduction
Electrons in theElectrons in the
object move awayobject move away
or towards anotheror towards another
charged object ischarged object is
placed close to itplaced close to it
Friction
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What happens when you rub a balloon on your head and put it against the wall?
Static electricity occurs when electrons transfer to your clothes or hair and give them a charge. When you touch something, the charge is released, causing a "jolt"
How do you think this machine affects the hair on these girls?
Static Electricity
How are static charges detected?
When Lightning Strikes!!!
Lightning
What causes lightning?
Lightning is actually Lightning is actually just just static electricitystatic electricity on a much larger on a much larger scale.scale.
The rubbing is The rubbing is caused by air caused by air moving aroundmoving around
In thunderclouds In thunderclouds bottom is usually bottom is usually negative and top is negative and top is positive.positive.
Uses of Static Electricity
Spraying a Car Positive Car
Negative Spraygun
The paint spreads out as each negative drop repels
No paint is wasted as the positive car attracts the negative paint
Removing Smoke from Power Station Chimneys
Positive Plate
Negative Plate
Charge up the Smoke
No smoke leaves the chimney
Earthing Petrol Tankers
Petrol rubbing against the pipe can build up a static charge which could cause an explosionThe tanker is joined to the ground with a wire to stop a charge building up
Insulators and Conductors
Insulators don’t Insulators don’t let electrons flow let electrons flow through themthrough them
Conductors let Conductors let electrons flow electrons flow through themthrough them
Electrons stay stuck on the surface and don’t move—That’s STATIC ELECTRICITY!