# 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…

### Page 2

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…

### Page 3

fuse, the fuse wire gets hot and melts or breaks breaking the
circuit. 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…

With Earthing: