The watt (symbol: W) is a unit of power or radiant flux. In the International System of Units (SI), it is defined as a derived unit of (in SI base units) 1 kg⋅m2⋅s−3 or, equivalently, 1 joule per second. It is used to quantify the rate of energy transfer. The watt is named after James Watt (1736-1819), an 18th-century Scottish inventor.
|Unit system||SI derived unit|
|Named after||James Watt|
|1 W in ...||... is equal to ...|
|SI base units||kg⋅m2⋅s−3|
|CGS units||107 erg⋅s−1|
|English Engineering Units||0.7375621 ft⋅lbf/s = 0.001341022 hp|