Power is defined as the rate of doing work.
`”Power” = (“Work done”)/(“Time taken”)`
or `P = (W)/(t)`
where P = Power
W = Work done
and t = Time taken
Power is also defined as the rate at which energy is consumed (or utilised).

Power of a body is defined as the rate at which the body can do the work.

(1) Dimension : [P] = [ML²T^–3] 

(2) Units : Watt or Joule/sec [S.I.] 

Practical Units : Kilowatt (kW), Mega watt (MW) and Horse power (hp) 

Relations between different units : 1 watt = 1 Joule/sec = 10⁷ erg/sec 

1hp = 746 Watt 

(3) The slope of work time curve gives the instantaneous power. As P = dW/dt = tan θ