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WATT

watt
Unit system SI derived unit
Unit of Power
Symbol W 
Named after James Watt
1 W in ... ... is equal to ...
   SI base units    kgm2s−3
   CGS units    1×107 erg s−1
SI multiples for watt (W)
Submultiples Multiples
Value SI symbol Name Value SI symbol Name
10−1 W dW deciwatt 101 W daW decawatt
10−2 W cW centiwatt 102 W hW hectowatt
10−3 W mW milliwatt 103 W kW kilowatt
10−6 W µW microwatt 106 W MW megawatt
10−9 W nW nanowatt 109 W GW gigawatt
10−12 W pW picowatt 1012 W TW terawatt
10−15 W fW femtowatt 1015 W PW petawatt
10−18 W aW attowatt 1018 W EW exawatt
10−21 W zW zeptowatt 1021 W ZW zettawatt
10−24 W yW yoctowatt 1024 W YW yottawatt
Common multiples are in bold face

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 .

When an object's velocity is held constant at one meter per second against constant opposing force of one newton the rate at which work is done is 1 watt.

In terms of electromagnetism, one watt is the rate at which work is done when one ampere (A) of current flows through an electrical potential difference of one volt (V).

Two additional unit conversions for watt can be found using the above equation and Ohm's Law.


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