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EnergyThe ability to do work. It is a scalar quantity (i.e., it does not specify a direction). It is closely related to torque, which is rotational force. Common units are the joule, kilowatt-hour and foot-pound. per unit of time. Common units include the watt and horsepower.

See also: Efficiency, Energy, n100W, Power-Speed Coefficient, Torque, Watt