Question

commercial unit:
a) Why is kilowatt hour used as a commercial unit of energy?
b) A 120 W electric fan runs for 7h. Calculate the electrical energy consumed
by it in kilowatt-hour.​

Answer 1

Explanation:

(a).COMMERCIAL UNIT OF ENERGY:

SI unit of electrical energy is Joules.

Commercial unit of electrical energy is kilowatt-hour. It is defined as the energy consumed by a device of power 1 kW in 1 hr.

1 kWh=3.6×106 J

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