Energie
    
  Joules J
=
 Watt/seconde W/s  
  Watt W
=
 Joule/seconde J/s  
  Watt/seconde  W/s
=
 Mega-Joule MJ  
  Mega-Joule MJ
=
 KiloWatt/uur kWh  
  Mega-Joule MJ
=
 Kilocalorie kCal  
  Mega-Joule MJ
=
 British thermal unit  Btu