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Concept
Electric power
Summary
Electric power is the rate at which electrical energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second. Standard prefixes apply to watts as with other SI units: thousands, millions and billions of watts are called kilowatts, megawatts and gigawatts respectively.
A common misconception is that electric power is bought and sold, but actually electrical energy is bought and sold. For example, electricity sold to consumers is measured in terms of amounts of energy, kilowatt-hours (kilowatts multiplied by hours), and not the rate at which this energy is transferred.
Electric power is usually produced by electric generators, but can also be supplied by sources such as electric batteries. It is usually supplied to businesses and homes (as domestic mains electricity) by the electric power industry through an electrical grid.
Electric power can be delivered over long distances by transmission lines and used for applications such as motion, light
Official source
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