Watt

(W) a unit of power that is the rate of WORK done at I JOULE per second, i.e. I W = 1 Js^-1.

Taken from Dictionary of Science

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The watt is a derived unit of power in the International System of Units (SI), named after the 18th-century Scottish engineeer James Watt. Its unit symbol is W. The unit measures the rate of energy conversion.

• One watt is equal to 1 joule (J) of energy per second.

• In terms of mechanical energy, one watt is the rate at which work is done when an object is moved at a speed of one meter per second against a force of one newton.

1W = 1Js^-1 = 1kgm²s^-3 = 1Nms^-1

• By the definitions of electric potential (volt) and current (ampere), work is done at a rate of one watt when one ampere flows through a potential difference of one volt.

1W=1V×1A

Taken from Wikipedia