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Energy is the measure of the ability to do work or cause a change. Work is a measure of the amount of energy required to move an object.
Energy does not simply appear and disappear. Energy is transferred from one position to another or transformed from one type of energy to another.
Power is a measure of the rate at which energy is used. Thermal power is the term used to refer to the transfer of heat. Mechanical power is the term used to describe when work is being done.