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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 metre in the direction of action of the force, equivalent to one 3600th of a watt-hour.
‘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.’
‘They reckon it would release two billion joules of energy.’
‘And a joule is indeed a sensible sort of unit in everyday life - a 60-watt lightbulb radiates 60 joules of energy every second.’
‘One calorie of heat is equivalent to 4.2 joules of work.’
‘One joule of output energy will energise approximately 6 miles of wire with no interference.’
Origin
Late 19th century: named after J. P. Joule (see Joule, James Prescott).