Define one watt.
(N/A) The power expended by a source is said to be $1$ watt,if $1$ ampere of current flows through it under a potential difference of $1$ volt. Mathematically,$P = V \times I$,where $P$ is power in watts,$V$ is potential difference in volts,and $I$ is current in amperes. Thus,$1 \text{ watt} = 1 \text{ volt} \times 1 \text{ ampere}$.
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