What is the commercial unit of electrical energy? Represent it in terms of joules.
The commercial unit of current is kilowatt hour (kWh).
In one hour we have = 60×60 sec=3600 sec
So total joules spent in 3600 seconds = 3600×1000 J
= 3.6×106 J
Therefore, 1kilowatt hour = 3.6×106 J