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Electric power - Wikipedia, the free encyclopedia
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Electric power
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For delivered electric energy, see
Electric power industry. For concept of expenditure of energy, see
Power (physics).
Electric power is the rate at which
electric energy is transferred by an
electric circuit. The
SI unit of power is the
watt.
Electric energy is transmitted with overhead lines on pylons like these.
For underground transmission see
high voltage cables.
Contents
Mathematics of electric power
Circuits
Electric power, like mechanical power, is represented by the letter P in electrical equations. The term wattage is used colloquially to mean "electric power in watts."
Direct current
In direct current
resistive circuits, electrical power is calculated using
Joule's law:
where P is the electric power, V the
potential difference, and I the
electric current.
In the case of
resistive (Ohmic, or linear) loads, Joule's law can be co...
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