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Q.

What is the commercial unit of energy?


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a

Newton

b

Kilowatt

c

Kilowatt-hour

d

Both 2 and 3 

answer is C.

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Detailed Solution

Kilowatt-hour is the commercial unit of energy.
The commercial unit of energy is a kilowatt-hour. One kilowatt-hour is the amount of electrical energy consumed when an electrical appliance having a power rating of 1 kilowatt is used for 1 hour. We know that
⇒ Energy = power × time 
⇒ Energy =  kW×h( hour)
 
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