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watt (W)
A unit of power in the metric system, expressed in terms of energy per second. One watt is equal to the work done at a rate of 1 joule per second. One ampere of current flowing at a potential of one volt produces one watt of electric power. One watt equals 1/746 horsepower. One megawatt = 1 million watts, and is a standard measure of electric power plant generating capacity. One gigawatt (GW) = 1 billion watts.
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