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What is Mains Electricity?

The electricity that comes into your house through
the wall sockets is called mains electricity.
It is different from the direct current electricity that
comes from cells in two important ways.

1. It is alternating current (a.c.)

2.  It is at a much higher voltage (it can kill you!).
Mains electricity in the UK is supplied at 230 volts.
In the USA it is 110 volts.
A cell or battery is typically 1·5 to 12 volts,
which is much less dangerous.

It is very important
to know how to use mains electricity safely.

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