Smallest commercial unit of energy is

Kilowatt hour

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Watt second

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Watt hour

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Watt minutes

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Solution

The correct option is B Watt hour
Smallest commercial unit of energy is called Watt hour $(W h)$ . One watt hour is the energy consumed when $1 w a t t$ of power is used for $1 h o u r .$

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k i l o w a t t - h o u r (k W h)

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