Power

Power
Definition: Power is the time rate of doing work or, the amount of work done per second.

Average Power:


= = F = F (9)

where t is the time interval in which the work is done.

Instantaneous Power:


P = Fv.

Note:

Power is a scalar.
SI Units: 1 Watt ( W ) = 1 Joule/sec = 1 kg m 2/ s 3
British Engineering Units: 1 horsepower ( hp ) = 746 W .