Electric power
Electric power is the rate, per unit time, at which electrical energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second.
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 electric power grid. Electric power is sold by the kilowatt hour (3.6 MJ) which is the product of power in kilowatts multiplied by running time in hours. Electric utilities measure power using an electricity meter, which keeps a running total of the electric energy delivered to a customer.
Generation and transmission[edit]
Electric power, produced from central generating stations and distributed over long distances, powers most of the devices used in the home and workplace. Generators in power plants create electric power by converting mechanical power to electrical power. This is usually done with an electric generator, a device that converts mechanical energy to electrical energy.
The power grid is the network of power lines and associated equipment used to transmit and distribute electricity over long distances. It includes power stations, transmission lines, distribution lines, and substations.
Consumption[edit]
Electric power is consumed by electric appliances and lighting in homes, offices, and industrial facilities. It is also used in electric vehicles, electric trains, and other electrically powered transportation.
Measurement[edit]
Electric power is measured in watts (W), which is equal to one joule of energy per second. The amount of electric power consumed over time is measured in kilowatt-hours (kWh).
Safety[edit]
Electric power can be dangerous if not handled correctly. Electrical safety measures are important to prevent electric shock, electrical fires, and other hazards.
See also[edit]
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