Question

Define power. Give its unit.

Answer 1

1. Power is defined as the rate of doing work.
2. Power can be obtained by dividing the ‘work done’ by ‘Time taken’ for doing the work.

$$\begin{gathered} \mathit{P}\mathit{o}\mathit{w}\mathit{e}\mathit{r}\mathbf{=}\frac{\mathbf{W}\mathbf{o}\mathbf{r}\mathbf{k}\mathbf{}\mathbf{d}\mathbf{o}\mathbf{n}\mathbf{e}}{\mathbf{T}\mathbf{i}\mathbf{m}\mathbf{e}\mathbf{}\mathbf{t}\mathbf{a}\mathbf{k}\mathbf{e}\mathbf{n}} \\ \mathit{P}\mathbf{=}\frac{\mathbf{W}}{\mathbf{t}} \end{gathered}$$

3.The SI unit of power is watt which is denoted by the symbol $W.$