joule (jl, joul) n. Abbr. J or j1. The International System unit of electrical, mechanical, and thermal energy.
2.a. A unit of electrical energy equal to the work done when a current of one ampere is passed through a resistance of one ohm for one second.
b. A unit of energy equal to the work done when a force of one newton acts through a distance of one meter. See Table at measurement.
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