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Power stations on a national grid generate Alternating Current (AC)

This power is sometimes referred to as 'Mains' electricity or 'Network' (Netz) electricity.

The output from a power station is at a very high voltage. This allows it to be sent down very long wires (Transmission Lines) without loosing voltage, due to the resistance of the wires.

AC can easily be changed from high voltage to low (and back again) by a very simple transformer.

The reduced voltage for use in a house, is either 230v (Europe) or 110v (USA).

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