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[for James Watt], abbr. W, unit of power, or work done per unit time, equal to 1 joule per second. It is used as a measure of electrical and mechanical power. One watt is the amount of power that is delivered to a component of an electric circuit when a current of 1 ampere
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a multiple of the watt, which is the unit of power in the International System of Units. It is equal to the power that produces work of a kilojoule in 1 sec. It is designated kW; 1 kW = 1,000 W = 1010 erg/sec = 101.97 kgf · m/sec = 1.36 hp = 859.84 kcal/hr.