Electric power is defined as the rate at which electrical energy is transferred by an electric circuit. The SI unit of power is the watt.
Electrical power is distributed via cables and electricity pylons like these in Brisbane, Australia.When electric current flows in a circuit with resistance, it does work. Devices convert this work into many useful forms, such as heat (electric heaters), light (light bulbs), motion (electric motors) and sound (loudspeaker). Electricity can be produced by generation or from storage such as batteries.
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