A network of cables connecting power stations to homes and other buildings. Step-up transformers are used at power stations and step-down transformers are used at sub-stations near homes.
Voltages:
400,000 - Carried by pylons
33,000 - Heavy industry
25,000 - Generated by power station
11,000 - Hospitals and light industry
230 - Homes, shops, offices
Power (Watts) " Current (Amps) x Voltage (Volts)
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