joule

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joule (jōōl, joul), abbr. J, unit of work or energy in the mks system of units, which is based on the metric system; it is the work done or energy expended by a force of 1 newton acting through a distance of 1 meter. The joule is named for James P. Joule.

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joule Symbol J. The SI unit of work and energy equal to the work done when the point of application of a force of one newton moves, in the direction of the force, a distance of one metre. 1 joule = 107 ergs = 0.2388 calorie. It is named after James Prescott Joule (1818–89).

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joule / joōl; joul/ (abbr.: J) • n. the SI unit of work or energy, equal to the work done by a force of one newton when its point of application moves one meter in the direction of action of the force, equivalent to one 3600th of a watt-hour.

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Joule The SI (Système Internationale) unit of energy; used to express energy content of foods and energy expenditure; 4.2 kilojoules (kJ) is equivalent to 1 kilocalorie (kcal). Named after James Prescott Joule (1818–1889), British physicist, who determined the equivalence of heat and energy, and the mechanical equivalent of heat.

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joule (symbol J) SI unit of energy. One joule is the work done by a force of one newton acting over a distance of one metre. It was named after James P. Joule and replaced the erg.

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joule (jool) n. the SI unit of work or energy, equal to the work done when the point of application of a force of 1 newton is displaced through a distance of 1 metre in the direction of the force. Symbol: J. See also calorie.

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joule electrical unit, named 1882 after James Prescott Joule, English physicist.