WikiNow lets you discover the news you care about, follow the topics that matter to you and share your favourite stories with your friends.

© WikiNow

The watt is a derived unit of power in the International System of Units , named after the Scottish engineer James Watt . The unit is defined as 1 joule per second and can be used to express the rate of energy conversion or transfer with respect to time. It has dimensions of Mass·Length2·Time−3.

watt
Unit system SI derived unit
Unit of Power
Symbol W 
Named after James Watt
Unit conversions
1 W in ... ... is equal to ...
   SI base units    kgms
   CGS units    1×10 erg s

The watt (symbol: W) is a derived unit of power in the International System of Units (SI), named after the Scottish engineer James Watt (1736–1819). The unit is defined as 1 joule per second and can be used to express the rate of energy conversion or transfer with respect to time. It has dimensions of Mass·Length·Time.