Question

what is power? define 1 watt of power?
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Answer 1

Power is defined as the rate of energy required to do work is known as power.

Its SI unit is watt (W)

One 1 watt is define as the work done in 1 joule to the some particular time or min or sec.

Mathematically;

1 W= 1J/1s

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Answer 2

power is the rate of doing work or of transferring heat, i.e. the amount of energy transferred or converted per unit time. 
1 watt of power defined as a derived unit of 1 joule per second