Cut to the Chase
Power is defined as the rate at which work is done.
If we replace the eqn for work, W=F.δs in (1) the power, the power is then P=F.(δs/δt), we recognise that δs/δt is the average velocity, v therefore, work is also,P=F.v.
The unit of power is the Joule per second, [J.s-1] which is more commonly called a Watt [W]. Another unit commonly used to measure power, especially in everyday situations, is the horsepower, which is equivalent to about 746 Watts. The rate at which our automobiles do work is measured in horsepower.