Question

 1. Define power.

2.Define unit of power.

Answer 1

Power is the rate of doing work
unit of power is watt.Power is defined as 1 watt when 1joule of work done in 1 sac

Answer 2

$\large{\underline{\underline{\sf{Power-}}}}$

It is defined as the time rate at which work is done or energy is transferred. The average power is defined as work by time. W to the total time t taken,

$\sf{P_{av} = \dfrac{W}{t}}$

Instantaneous power -

$\sf{P_{av} = \dfrac{dW}{t}}$

Work dW done by F force for displacement bdr→ is -

dW = $\vec{F}$. $d\vec{r}$

Also, it can be expressed as -

$\sf{P = \vec{F} . \dfrac{d\vec{r}}{dt} = \vec{F}. \vec{v}}$

Where v is instantaneous velocity when force applied is F.

- Power is a scaler quantity.

- Dimension = [ML²T-³].

- It's S.I unit is watt.

- Power is said to be of one watt is one joule of work is done in one second.