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Q.

Which one of the following is not the unit of energy?


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a

Joule

b

Newton meter

c

Kilowatt

d

Kilowatt hour 

answer is C.

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Detailed Solution

This is because the amount of energy consumed by a device in working hour at a constant rate of kilowatt hour. Therefore when a force of one Newton is applied over a body then one meter over a displacement in the direction of the force applied. So, the energy is Newton meter. Hence, the SI unit of energy is the joule. Thus, Kilowatt is the SI unit of power which is not the unit of energy.
 
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