Power stations generate electricity at 24,000V by rotating a coil of wire inside a magnetic field., Step up transformers increase the voltage to 400,000V. This allows the electricity to be transmitted at a lower current., The lower current in the wires means less power is dissipated as heat., Tall pylons hold the thick transmission cables far above the ground to keep people safe from the high voltages., Step down transformers reduce the voltage to a much safer and lower voltage., Homes and businesses have AC mains electricity supplied at 230V and 50Hz.

The National Grid

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