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Energy-is the capacity system to perform work

Power-is the work done in a given period of time.It is measure of how quickly work can be done.

Energy can be defined as the capacity for doing work.You must have energy to accomplish work - it is like the "currency" for performing work. = To do 100 joules of work, you must expend 100 joules of energy.

Power is the work done in a unit of time.Power is a measure of how quickly work can be done. = If you do 100 joules of work in one second (using 100 joules of energy), the power is 100 watts.