## watt

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watt [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 flows through the component and a voltage of 1 volt exists across it. The derivative units are kilowatt (1,000 W; kW) and megawatt (1,000,000 W; MW), used in electric power systems, and milliwatt (0.001 W; mW) and microwatt (0.000001 W; μW), used in electronics.

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watt / wät/ (abbr.: W) • n. the SI unit of power, equivalent to one joule per second, corresponding to the power in an electric circuit in which the potential difference is one volt and the current one ampere.

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watt Unit of power in the SI system of units. A machine consuming one joule of energy per second has a power output of one watt. One horsepower corresponds to 746 watts. A watt is also a unit of electrical power, equal to the product of voltage and current. It is named after the Scottish engineer James Watt

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watt (physics) unit of activity or power. XIX. f. name of James Watt (1736–1819), inventor of the modern steam engine and a pioneer in the science of energy.

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watt (wot) n. the SI unit of power, equal to 1 joule per second. Symbol: W.