Watt
Overview

When an object's velocity is held constant at one meter per second against a constant opposing force of one newton, the rate at which work is done is one watt. 1 W = 1 J / s = 1 N ⋅ m / s = 1 k g ⋅ m 2 ⋅ s − 3. {\displaystyle \mathrm {1~W=1~J{/}s=1~N{\cdot }m{/}s=1~kg{\cdot }m^{2}{\cdot }s^{-3}}.}

In terms of electromagnetism, one watt is the rate at which electrical work is performed when a current of one ampere (A) flows across an electrical potential difference of one volt (V), meaning the watt is equivalent to the volt-ampere (the latter unit, however, is used for a different quantity from the real power of an electrical circuit). 1 W = 1 V ⋅ A. {\displaystyle \mathrm {1~W=1~V{\cdot }A}.}

Two additional unit conversions for watt can be found using the above equation and Ohm's law. 1 W = 1 V 2 / Ω = 1 A 2 ⋅ Ω, {\displaystyle \mathrm {1~W=1~V^{2}/\Omega =1~A^{2}{\cdot }\Omega },} where ohm (Ω {\displaystyle \Omega }) is the SI derived unit of electrical resistance.
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