power [%PREMIUM_LINK%] (pou'ər) Pronunciation Key |
The source of energy used to operate a machine or other system.
The rate at which work is done, or energy expended, per unit time. Power is usually measured in watts (especially for electrical power) or horsepower (especially for mechanical power). For a path conducting electrical current, such as a component in an electric circuit, P = VI, where P is the power dissipated along the path, V is the voltage across the path, and I is the current through the path. Compare energy, work.
Mathematics The number of times a number or expression is multiplied by itself, as shown by an exponent. Thus ten to the sixth power, or 106, equals one million.
A number that represents the magnification of an optical instrument, such as a microscope or telescope. A 500-power microscope can magnify an image to 500 times its original size.