Definition of joule in English:

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Pronunciation: /jo͞ol/
(abbreviation J)


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.
Example sentences
  • And a joule is indeed a sensible sort of unit in everyday life - a 60-watt lightbulb radiates 60 joules of energy every second.
  • The unit of absorbed dose is call the gray, which is the amount of energy in joules from the radiation absorbed per kilogram of the absorbing material.
  • One calorie of heat is equivalent to 4.2 joules of work.


Late 19th century: named after J. P. Joule (see Joule, James Prescott).

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