P2: Mains Electricity

Here is a document for students taking AQA Additional Science. This document contains everything from the Mains electricity section in physics. This is based on the revision cards called P2: Mains Electricity (link: http://getrevising.co.uk/resources/p2_mains_electricity ) in my area, this contains additional diagrams to explain. I hope this helps you to revise! Please rate and comment on how to improve :) Also, I have a study group called AQA Additional Science where we discuss topics such as this one and many more. Feel free to become a member, the more the merrier!

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  • Created on: 29-12-09 16:26
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P2: Mains Electricity
Currents
Direct current (d.c.) = an electric current which flows in one
direction
Alternating current (a.c.) = an electric current which changes
direction of flow continuously
Cells and batteries supply direct current whereas mains electricity
is an alternating current (a.c.) supply.
The UK mains supply is 230 volts with a frequency of 50 cycles
per second (50 hertz).
The 3Pin Plug
Most electrical appliances are connected to the mains using cable
and a three pin plug.
The structure of a three pin plug:

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The inner cores of the wires are made of copper because it is a
good conductor
The outer layers are made of flexible plastic which is a good
insulator
The pins of a plug are made from brass because it is a good
conductor
Note: You must know the structure of a three pin plug and the
correct wiring of a three pin plug
Circuit Breakers and Fuses
If an electrical fault causes too great a current the circuit should be
switched off by a…read more

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The current rating of the fuse must be just above the
normal working current for the safety system to work properly.
With a Fuse:
Earthing
All electrical appliances with outer metal cases must be earthed.
The outer case of an appliance is connected to the earth pin in the
plug through the earth wire.
The earth wire and fuse together protect the appliance and the
user
If a fault in the appliance connects the live wire to the case, the
case will become live.…read more

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With Earthing:…read more

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