joule facts for kids
For the physicist named James Prescott Joule, see James Prescott Joule.


Standard:  SI derived unit 
Quantity:  Energy 
Symbol:  J 
Named after:  James Prescott Joule 
Expressed in:  1 J = 
SI base units  1 kg·m^{2}/s^{2} 
CGS units  1×10^{7} erg 
kilowatt hours  2.78×10^{−7} kW·h 
kilocalories  2.39×10^{−4} kcal 
BTUs  9.48×10^{−4} BTU 
A joule (/ˈdʒuːl/ or sometimes /ˈdʒaʊl/) 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.