The time rate of work done by a body is called its power.

Power = Rate of doing work = Work done / Time taken

If under a constant force F a body is displaced through a distance s in time t, the power

p = W / t = F * s / t

But s / t = v; uniform velocity with which body is displaced.

NOTE: P = F * v = F v cos θ

Where θ is the smaller angle between F and v.

Power is a scalar quantity. Its S1 unit is watt and its dimensional formula is [ML2T-3].

Its other units are kilowatt and horse power,

1 kilowatt = 1000 watt

1 horse power = 746 watt