|Standard:||SI derived unit|
|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|
A joule (// or sometimes //) is a unit in the SI system. That means that scientists use it. It measures energy; usually in scientific or electrical appliances . It is named after James Prescott Joule.
It is also the work done passing one amp through a resistance of one ohm for one second.