Meaning

noun a unit of electrical energy equal to the work done when a current of one ampere passes through a resistance of one ohm for one second

noun English physicist who established the mechanical theory of heat and discovered the first law of thermodynamics (1818-1889)

originNamed after English physicist James Prescott Joule (1818–1889). The surname is a variant of Joel.

Etymology from Wiktionary, CC BY-SA 3.0