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Energy is an amount, while power is a rate at which energy is used. Energy is measured in watt-hours (WÂ·h) or joules (J). Power is measured in watts (W) or joules per second (J/s). Watt-hours are like buckets, and watts are like buckets per hour. If you have 5 buckets of energy and you pour one bucket per hour, you'll be able to pour for 5 hours before you run out.
Physics Definition: Power is the rate of energy consumed in a unit of time (Power = Work/ time). In exercise, itâs the rate of performing muscular work, with potential energy becoming work (aka moving weight) or heat (aka, you getting warm). This is easier to understand if you realize that Work = Force x Distance.