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Commercial unit of energy is kilo watt hour (kWh)
The unit kilowatt-hour means one kilowatt of power supplied for one hour.
1 kWh = 1 kW x 1 h
= 1000 W x 60 x 60 s
-1
= 1000 Js x 3600 s
6
= 3.6 x 10 J
6
1 unit = 1 kilowatt hour = 3.6x10 J.
