The watt (symbol: W) is the unit of power or radiant flux in the International System of Units (SI), equal to 1 joule per second or 1 kg⋅m2⋅s−3.[1][2][3] It is used to quantify the rate of energy transfer. The watt is named after James Watt (1736–1819), an 18th-century Scottish inventor, mechanical engineer, and chemist who improved the Newcomen engine with his own steam engine in 1776. Watt's invention was fundamental for the Industrial Revolution.

Unit systemSI
Unit ofpower
Named afterJames Watt
1 W in ...... is equal to ...
   SI base units   1 kgm2s−3
   CGS units   107 ergs−1
   English Engineering Units   0.7375621 ft⋅lbf/s = 0.001341022 hp

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