Friday, February 12, 2010

Power is the rate at which work is performed or energy is converted. It is an energy per unit of time. As a rate of change of work done or the energy of a subsystem, power is

where P is power, W is work and t is time.

The SI unit of power is the watt (W), which is equal to one joule per second.

http://en.wikipedia.org/wiki/Power_%28physics%29