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The definition of energy. An easy to understand energy definition. Energy is the ability to make something happen. Science and technology education from FT Exploring.
Energy is the capacity to do work and transfer heat. Work is performed when an object or substance is moved over some distance. Energy is needed to carry out processes, such as boiling water or burning candles. Energy is also the heat that flows from a hot object or substance to a cold one, when they come in contact.