Define $1$ watt of power.

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(N/A) body is said to have a power of $1$ watt if it does work at the rate of $1$ joule per second.
Mathematically,it is expressed as:
$1\,W = 1\,J/1\,s$
This means that $1$ watt is the power consumed when $1$ joule of work is done in $1$ second.

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