| Abstract from DBPedia | 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 is sold to consumers in kilowatt-hours (kilowatts multiplied by hours), because energy is power multiplied by time. 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 or heat with high efficiency.電力（でんりょく、英: electric power）とは、単位時間に電流がする仕事（量）のことである。なお、「電力系統における電力」とは、単位時間に発電機等によって発電され、送電線によって送られ（送電）、そして電気器具によって消費される、単位時間あたりの電気エネルギーを言う。国際単位系 (SI) においてはワット W が単位として用いられる。 なお、電力を時間ごとに積算したものは電力量 (electric energy) と呼び、電力とは区別される。つまり、電力を時間積分したものが電力量であり、量の次元としてはエネルギーに等しい。 (Source: http://dbpedia.org/resource/Electric_power) |
