In a physics term, power is the rate at which work takes place or energy is transmitted. It is also the amount of energy needed or used to complete an activity over a period of time.
The SI unit for power is the the Watt or "W". The equation for power is P = W/t where P is power, W is work and t is time. Another equation for power is P = E/t where E is energy and t is time. --Jaran Ellermeyer 13:15, 5 October 2007 (PDT)