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The '''watt''' (symbol: W) is the [[SI]] [[SI derived unit|derived unit]] for [[power (physics)|power]]. It is equivalent to one [[joule]] per [[second]] (1 J/s), or in electrical units, one [[volt]] [[ampere]] (1 V·A). 

It is the rate in joules per second at which energy is being converted, used, or dissipated.

: '''Equations''': <math>\mbox{ W} = \frac{\mbox{J}} {\mbox{s}} = \frac{\mbox{N·m}} {\mbox{s}} = \frac{\mbox{kg·m}^2} {\mbox{s}^3} = \mbox{ V·A}</math>

The unit ''watt'' is named after [[James Watt]] for his contributions to the development of the [[steam engine]], and was adopted by the Second Congress of the British Association for the Advancement of Science in [[1889]] and by the 11th [[Conférence Générale des Poids et Mesures]] in [[1960]].

1 MWd or MW·d (megawatt day) = 86.4 GJ, a unit used in the context of power plants.

For the use of watts as a measurement in [[broadcasting]], see [[effective radiated power]] and [[nominal power]] for a full discussion.

==See also==
* [[SI]]
* [[kilowatt hour]] (kW·h)
* [[watt balance]]
* [[conversion of units]]
* [[Orders of magnitude (power)]]
* [[James Watt]]
* [[Root mean square|RMS]]

==External link==
* Nelson, Robert A.,  "''[http://www.aticourses.com/international_system_units.htm The International System of Units] Its History and Use in Science and Industry''". Via Satellite, February 2000. 

[[Category:SI derived units]]
[[Category:Units of power]]

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