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Mains Electricity
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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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alternating current
circuit breaker
diode
direct current
dynamo
earth
earth leakage circuit breaker
electric power
electrical safety
electricity
electromotive force
fuse
generator
insulator
kilowatt
kilowatt-hour
mains electricity
national grid
plug, three-pin
power rating
power station
power transmission
residual current device
transformer
voltage
watt
circuit breaker
diode
direct current
dynamo
earth
earth leakage circuit breaker
electric power
electrical safety
electricity
electromotive force
fuse
generator
insulator
kilowatt
kilowatt-hour
mains electricity
national grid
plug, three-pin
power rating
power station
power transmission
residual current device
transformer
voltage
watt
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