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What is power? 

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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

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