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Mains Electricity
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Mains Electricity

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Mains Electricity

The mains electricity is an AC supply. In the UK, the domestic electricity supply has a frequency of 50 Hz and is about 230 V.

What is mains electricity?

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Do you think mains electricity is alternating current (AC) or direct current (DC)?

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AC constantly changes direction. If the AC of mains electricity changes direction 50 times per second, what is the frequency of mains electricity?

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In the U.K., the mains electricity is supplied to homes by power stations as AC that has a frequency of 50 Hertz. That means that the electricity changes direction 50 times per second.

What do we actually mean when we talk about the voltage of an electrical supply?

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Which of these do you think is a realistic voltage for mains electricity?

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We use mains electricity to power everything in our homes. In the U.K. it has a voltage of 230 V.

If we transport electricity a long way, is it better to have a high or low voltage?

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Why is mains electricity supplied as AC rather than DC?

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Mains electricity is transported from power stations to our homes over hundreds of miles, so it needs to travel with a high voltage. If we used a DC, we would lose a lot of energy as heat through the resistance in the cables. So instead, we transport the electricity as an AC with a high voltage and low current to reduce this heat loss.