The commercial unit of energy is:
A. Watt B. Watt-hour
C. Kilowatt-hour D. Kilowatt
SI unit of energy is Joule.
Commercial unit of energy is KWh
1 KWh = 1 kW * 1 h
= 1000 W * 3600 s
1 watt – second = 1 Joule
1 kWh = 3600000 J