A cewar ƙamus, Joule shine naúrar ma'aunin da ake amfani da ita don ƙididdige makamashi ko aiki. Joule ɗaya yana daidai da adadin kuzarin da aka yi amfani da shi lokacin da aka yi amfani da ƙarfin Newton ɗaya a kan tazarar mita ɗaya zuwa ga ƙarfin. Sunan Joule ne bayan masanin kimiyyar lissafi dan Ingila James Prescott Joule, wanda ya taimaka wajen kafa ka'idar farko ta thermodynamics.
