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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.
For other uses, see Watt (disambiguation). The watt (symbol: W) is a derived unit of power in the International System of Units (SI) defined as 1 joule per second and can be used to quantify the rate of energy transfer. Power has dimensions of M L 2 T â 3 {\displaystyle {\mathsf {ML}}^{2}{\mathsf {T}}^{-3}} .