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Solution

✅ Correct Option: 4

Option 1 -> Volt is the unit of electric potential difference, not charge.

Option 2 -> Watt is the unit of power (rate of energy consumption), not charge.

Option 3 -> Ampere is the unit of electric current (rate of charge flow), not charge itself.

Option 4 -> Kilowatt hour is the commercial unit used for electrical energy consumption in billing.


Hence, Kilowatt hour (kWh) -> While the SI unit of charge is Coulomb, in commercial practice, electricity companies bill consumers based on energy consumed, measured in kilowatt hours (1 kWh = 1000 watts used for 1 hour). This is the standard unit on electricity bills worldwide -> correct

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