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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.
Convert kilowatt hours to million btu. In physics, energy is a scalar physical quantity that describes the amount of work that can be performed by a force, an attribute of objects and systems that is subject to a conservation law. Different forms of energy include kinetic, potential, thermal, gravitational, sound, light, elastic, and electromagnetic energy. The forms of energy are often named after a related force. (Wikipedia) Energy units are often used in relation to environmental protection, energy reserves and geopolitics.