The watt (symbol: W) is the SIderived unit for power. It is equivalent to one joule per second (1 J/s), or in electrical units, one voltampere (1 V·A).
It is the rate in joules per second at which energy is being converted, used, or dissipated.
Equations:
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.
Nelson, Robert A., "The International System of Units (http://www.aticourses.com/international_system_units.htm) Its History and Use in Science and Industry". Via Satellite, February 2000.
In electrical terms, one watt is the power produced by a current of one ampere flowing through an electric potential of one volt.
Since none of the units of Roman date-keeping (the month, the quarter, and the year) equal a whole number of weeks, this made it necessary for the first time to have tables (we call them calendars!) showing the ever-changing relationship between the days of the week and the dates of the month.
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