The rate of doing work is equal to the rate of using energy since the force transfers one unit of energy when it does one unit of work. Power is the time derivative of work.
Power is the work done in a unit of time. In other words, power is a measure of how quickly work can be done. The unit of power is the Watt = 1 Joule/ 1 second. One common unit of energy is the kilowatt-hour (kWh).
