Joule | joules unit
UnitofenergyintheSIsystemThejoule(jowl,jool;[1][2][3]symbol:J)isaderivedunitofenergyintheInternationalSystemofUnits.[4]Itisequaltotheenergytransferredto(orworkdoneon)anobjectwhenaforceofonenewtonactsonthatobjectinthedirectionoftheforcesmotionthroughadistanceofonemetre(1newtonmetreorN⋅m).Itisalsotheenergydissipatedasheatwhenanelectriccurrentofoneamperepassesthrougharesistanceofoneohmforonesecond.ItisnamedaftertheEnglishphysicistJamesPrescottJoule(1818–1889).[5][6][7]Definition[edit]Intermsfir...
Unit of energy in the SI system
The joule ( jowl, jool;[1][2][3] symbol: J) is a derived unit of energy in the International System of Units.[4] It is equal to the energy transferred to (or work done on) an object when a force of one newton acts on that object in the direction of the forces motion through a distance of one metre (1 newton metre or N⋅m). It is also the energy dissipated as heat when an electric current of one ampere passes through a resistance of one ohm for one second. It is named after the English physicist James Prescott Joule (1818–1889).[5][6][7]
Definition[edit]In terms firstly of base SI units and then in terms of other SI units, a joule is defined below (please consider this table for the meaning of symbols):
J=kg⋅m2s2=N⋅m=Pa⋅m3=W⋅s=C⋅V=Ω⋅A2⋅s,{displaystyle { ext{J}}={frac {{ ext{kg}}{cdot }{ ext{m}}{2}}{{ ext{s}}{2}}}={ ext{N}}{cdot }{ ext{m}}={ ext{Pa}}{cdot }{ ext{m}}{3}={ ext{W}}{cdot }{ ext{s}}={ ext{C}}{cdot }{ ...