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Watt

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The watt (symbol: W) is the SI derived unit of power, equal to one joule of energy per second. It measures a rate of energy conversion.

A human climbing a flight of stairs is doing work at a rate of about 200 watts. A typical automobile engine produces mechanical energy at a rate of 25,000 watts (approximately 33.5 horsepower) while cruising. A typical household incandescent light bulb uses electrical energy at a rate of 25 to 100 watts, while compact fluorescent lights typically consume 5 to 30 watts.

One watt is the rate at which work is done when an object is moving at one meter per second against a force of one newton.

1~\rm{W} = 1~\dfrac{\rm{J}}{\rm{s}} = 1~\dfrac{\rm{kg} \cdot \rm{m^2}}{\rm{s^3}} = 1~\dfrac{\rm{N\cdot m}}{\rm{s}} .

By the definition of the units of ampere and volt, work is done at a rate of one watt when one ampere flows through a potential difference of one volt.[1]

1~\rm{W} = 1~\rm{V \cdot } 1~\rm{ A}

 

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