Commercial unit of electric energy is

Kilowatt-hour is the commercial unit of electric energy.

Explanation

The basic unit of energy is the joule or watt-second. An electrical energy is said to be one joule when one ampere of current flows through the circuit for a second when the potential difference of one volt is applied across it.

Commercial unit of electrical energy

The commercial unit of electrical energy is the kilowatt-hour (kWh) which is also known as the Board of Trade unit (B.O.T).
1 kwh = 1000 × 60 × 60 watt-second
1 kwh = 36 × 105 Ws or Joules
Generally, one kwh is called one unit.

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