(B) Power is defined as the rate of doing work or the rate of transfer of energy.If $W$ is the amount of work done in time $t$,then power $P$ is given

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The rate of doing work or the rate of transfer of energy.

(B) Power is defined as the rate of doing work or the rate of transfer of energy.If $W$ is the amount of work done in time $t$,then power $P$ is given by the expression:$P = \frac{W}{t} = \frac{\text{Energy}}{\text{Time}}$The $SI$ unit of power is the watt $(W)$,which is defined as $1 \text{ joule per second } (J/s)$.