Quick facts for kids Joule 


Unit system  SI derived unit 
Unit of  Energy 
Symbol  J 
Named after  James Prescott Joule 
Conversions  
1 J in ...  ... is equal to ... 
SI base units  1 kg·m^{2}/s^{2} 
CGS units  ×10^{7} 1erg 
kilowatt hours  ×10^{−7} kW⋅h 2.78 
kilocalories  ×10^{−4} kcal 2.39 
BTUs  ×10^{−4} BTU 9.48 
electronvolts  ×10^{18} eV 6.24 
A joule ( or sometimes) is a unit in the SI system. It measures energy; usually in scientific or electrical appliances . It is named after James Prescott Joule.
A joule refers to the amount of energy transferred to an object when a force of 1 newton is applied on it over a distance of 1 metre (1J = 1N × 1m). It is related to the watt (a unit of power): one watt equals one joule per second.
It can also be understood as the work done for passing one ampere of Electric current through an Electric circuit of external resistance equivalent to one ohm for one second.
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Joule Facts for Kids. Kiddle Encyclopedia.