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Q.

The commercial unit of energy is


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a

Watt

b

Watt-hour

c

Kilowatt-hour

d

Kilo-joule 

answer is C.

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Detailed Solution

The commercial unit of energy is Kilowatt-hour.
When large quantities of energy are measured, the SI unit of energy becomes small. Therefore, the commercial unit is used. It is defined as how much amount of energy is used by a 1 kW electrical device in a time of 1 hr, and the numerical value is written as 1 kWh = 3.6 × 106 J. The SI unit of electrical energy is known as joule and is denoted (J).
 
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