joule

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Joule
Standard: SI derived unit
Quantity: Energy
Symbol: J
Named after: James Prescott Joule
Expressed in: 1 J =
SI base units 1 kg·m2/s2
CGS units 1×107 erg
kilowatt hours 2.78×10−7 kW·h
kilocalories 2.39×10−4 kcal
BTUs 9.48×10−4 BTU

A joule (/ˈl/ or sometimes /ˈl/) is a unit in the SI system. That means that scientists use it. It measures the work being done. It is named after James Prescott Joule.

A joule equals one newton multiplied by a meter (1J = 1N × 1m). It is related to the watt (a unit of power): one watt equals one joule per second.

It is also the work done passing one amp through a resistance of one ohm for one second.