Physics 2

Physics 2

Electricity

C/W Controlling CircuitsApr 22, 2023

Aims:- 4 know why a circuit doesn’t work 5 explain ‘series’ and ‘parallel’

6 control all circuits using switches• Starter – 5 minutes• Imagine you have set-up a circuit and it

doesn’t work.• Write down as many reasons as you can

to explain what might be the problem.

Copy notes – 5 minutes• If a circuit doesn’t work it is because

there is not a complete circuit• In a series circuit, if one thing

breaks, everything stops• A switch near the battery controls

everything• In a parallel circuit, a switch near

the device controls it separately

Practical – Set 1 – 40 minutes

• Build the circuits on Sheet D• Draw the circuit diagram in your

book• Describe the operation of the circuit• Highlight any important complete

circuits on your drawing• Do not try your own experiments!

Practical – Set 2 – 40 minutes• Look at Sheet C

– Explain why each circuit won’t work• Look at Sheet E

– What happens when bulbs or batteries are added to a circuit?

• Build circuits on Sheet D– Try to explain how each works before

going on to the next• Do not try your own experiments!

Practical – Set 3 – 40 minutes

• Draw Sheet C circuits in your book• For each one say why it will not work• Build the circuits on Sheet E• Complete these sentences:-

– “The more batteries …”– “The more bulbs …”

• Do not try your own experiments!

Homework• Answer worksheet questions in books

• Minimum: Set 3: Q’s 1 and 2 Set 2: Q’s 1, 2 and 3 Set 1: All Q’s

• Future electricians: try all questions

Are You On Target Today?Aims:- 4 know why a circuit doesn’t work 5 explain ‘series’ and

‘parallel’6 control all circuits using

switches

C/W CurrentApr 22, 2023

Aims:- 4 describe and measure current5 explain why current is not used up6 explain current using a model

• Starter – 5 minutes• Draw what you think you would see if

you were so small you could look inside a wire in a circuit (when it’s working!)

Copy notes – 5 minutes• Wires are full of particles• A battery makes the particles flow

round together (like doing a conga)• The speed of the flow is called current• Current is measured in amps (A)• An ammeter measures current• The current is never used-up because

the particles can’t be destroyed

Practical – 30 minutes• Set-up the circuits on Sheets F and

G• Advice: always set up circuits

without meters first; then add the meters

• In your book, copy the circuit and write down the current reading in each case

Plenary – Conclusions – 10 mins• What four things did you find out

from the experiment?

(Hints: The more batteries …, The more bulbs …, The current in a series circuit …, The current in a parallel circuit …)

Homework• Buy a fruit …

• … seriously – next time you will need a fruit (or vegetable e.g. potato) to do the practical – no fruit, no practical

Are You On Target Today?Aims:- 4 describe and measure current

5 explain why current is not used up

6 explain current using a model

C/W Cells / BatteriesApr 22, 2023

Aims:- 4 describe voltage & investigate a question5 relate voltage to energy & make a fair test6 explain voltage using a model & work precisely

• Starter – 5 minutes• Which electricity words are these?

Blub All real ‘p’Cute RNR I cut IRCTeam, erm?

Copy notes – 5 minutes• A battery is a group of cells• A cell stores chemical energy • It turns into electrical energy in a circuit• The current carries the electrical energy

as it flows round the circuit• The amount of energy the current gets

depends on the battery voltage• The current ‘hands over’ the energy

when it meets bulbs, motors etc.

Demo

Everyone’s a volunteer …

Practical – investigating fruit cells

• Investigating the voltage generated by the chemical energy in fruits

• First choose and a write down a question to investigate:– Does the type of fruit matter?– Does the distance between electrodes

matter?– Does the depth of electrodes matter?

Answer questions – 5 mins1. What are you going to measure

each time?2. What are you going to change

between measurements?3. What must you keep the same to

make it a fair test?4. How can you make sure you get

good results?

Practical – do it …

Make a table for your results and then get started

Plenary – Conclusion – 5 mins• Write a conclusion for your

experiment

Homework• Revise for test

Are You On Target Today?Aims:- 4 describe voltage & investigate a

question5 relate voltage to energy & make a fair

test6 explain voltage using a model & work

precisely