Dear student Power is the rate of doing work or the rate of utilizing energy.The SI unit of Power is Watt. 1 watt is the power of an agent, which does work at the rate of 1 joule per second. OR. Power is 1 watt when the rate of consumption of energy is 1 joule per second. 1W = 1J / 1s. One watt is also defined as the current flow of one ampere with voltage of one volt. Regards