Published: 2013-06-13 22:01:37
rrElectric power is the rate at which electric 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 chemical sources such as electric batteries. Electric power is generally supplied to businesses and homes by the electric power industry. Electric power is usually sold by the kilowatt hour (3.6 MJ) which is the product of power in kilowatts multiplied by running time in hours.
Electric power is transformed to other forms of power when electric charges move through an electric potential (voltage) difference. When an electric charge moves through a potential difference, from a high voltage to a low voltage, the potential does work on the charges, converting the energy in the potential to kinetic energy of the charges, or some other form. This occurs in most electrical appliances, such as light bulbs, electric motors, and heaters; they consume electric power, converting it to mechanical work, heat, light, etc.
