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mains electricity  A view of a switching centre, part of an electricity grid or network. This allows for power to be distributed from one area to another, where the need may be greater. | Domestic electricity supply system. In the UK, electricity is supplied to houses, offices, and most factories as an alternating current at a frequency of 50 hertz and a root-mean-square voltage of 230 volts. An advantage of having an alternating supply is that it may easily be changed, using a transformer, to a lower and safer voltage, such as 9 volts, for operating toys and for recharging batteries. |
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