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Definition of watt. : the absolute meter-kilogram-second unit of power equal to the work done at the rate of one joule per second or to the power produced by a current of one ampere across a potential difference of one volt : 1â746 horsepower.
watt. A unit used to measure power, equal to one joule of work per second. In electricity, a watt is equal to the amount of current (in amperes) multiplied by the amount of potential (in volts).. 1. (Units) the derived SI unit of power, equal to 1 joule per second; the power dissipated by a current of 1 ampere flowing across a potential difference of 1 volt. 1 watt is equivalent to 1.341 Ã 10 -3 horsepower.