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Question

Which of the following is not a unit of energy?

A
kilowatt
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B
kilowatt hour
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C
joule
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D
newton metre
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Solution

The correct option is A kilowatt
The S.I. unit of energy is joules (J).

Energy is defined as the capacity to do work and has the same unit as work. Since work is defined as product of Force and displacement, its S.I. unit is N m.

The S.I. unit of power is watt (W).
1 kW=1000 W
So, the answer is kilowatt.

Kilowatt hour is also a unit of energy which is commonly used in electrical applications.
1 kWh=3.6×106 J

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