The commercial unit of electrical energy is

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Joule

Calorie

Watt

Kilowatt hour

answer is A.

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Detailed Solution

Commercial unit of electric energy is kilowatt hour.

The commercial unit of electrical energy is the kilowatt-hour (kWh) because it is a practical and convenient measure for calculating electricity consumption in homes, offices, and industries. Here's why:
One kilowatt-hour represents the energy consumed when a device with a power of 1 kilowatt operates for 1 hour.

Other Options:

Calorie: A unit of heat energy, not typically used for electrical energy.
Joule: The SI unit of energy but too small for practical electricity billing.
Watt: A unit of power, not energy.

Summary

Electricity consumption is billed in kilowatt-hours (kWh) because it provides a practical scale for daily use, unlike smaller units like joules.

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