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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.
Although casually the terms energy and power are often used interchangeably, technically they have different meanings. The SI unit of energy and work (which are numerically the same) is the joule (J) . A joule is the work done by a force of one newton for a distance of one meter. This unit is usually used in physics.Energy comes in many forms, such as heat, motion, gravitational, radiated solar power, and electrical.he SI unit of energy and work (which are numerically the same) is the joule (J) . A joule is the work done by a force of one newton for a distance of one meter.