Additional Physics – Forces

L/O :- To understand mains electricity

Electricity in your home

Exam Date -

Quick quiz • What is the equation for work done?• How does current behave in a parallel

circuit?• What is an LDR and how does light

intensity affect the resistance?• What is charge measured in?• How can you work out resistance? • What affects the resistance in a circuit?• How does voltage behave in a parallel

circuit?• How can you work out power and what is

it measured in?• How does current behave in a series

circuit?• What is the equation for working out

current?• How does voltage behave in a series

circuit?

http://www.youtube.com/watch?v=SL6C8Yz_bgs

a) What is the difference between A.C. and D.C. current?

b) Where would you find A.C. current?c) Where would you find D.C. current?d) What is the frequency of mains

electricity?e) What is the voltage of mains

electricity?

Watch the demo from your teacher and then

answer these questions

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Wiring a plug

Earth wire

Neutral wire

Insulation

Live wire

Fuse

1.

2.

3.

4.

5.

6. Cable grip

The live wire of a plug alternates between positive and negative potential relative to the Earth

The neutral wire of a plug stays at a potential close to zero relative to the Earth

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What is wrong with the wiring of these plugs?

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What is wrong with the wiring of these plugs?

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What is wrong with the wiring of these plugs?

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What is wrong with the wiring of these plugs?

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Earth wiresEarth wiresEarth wires are always used if an appliance has a _____ case. If there is a _____ in the appliance, causing the live wire to ______ the case, the current “_______” down the earth wire and the ______ blows.

Words – fuse, fault, metal, surges, touch

MetalFault

Touch

surgesFuse

The earth wire allows the electricity a quick path to the ground

What have you learnt?

• Do you know what the frequency of mains electricity is?• Do you know what the voltage of mains electricity is?• Could you label a plug?• Can you recognise when a plug is incorrectly wired?