Electrical power

Alternating current is generated at power stations at a frequency of 60 Hz in the United States (50 Hz in the United Kingdom) and a voltage of 10 to 25 kV. This is fed into a grid of power lines and transmitted to the consumer via pylons or underground cables. The voltage is stepped up by transformers to 69 to 500 kV for transmission over long distances and then stepped down at the consumer end. The power lines are usually bare wires and are the cause of high-voltage accidents when touched by earthed ladders or cranes. Factories are supplied at voltages of 11 to 33 kV. Homes are supplied at 110 to 240 V.

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