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  • Which one of the following is not the unit of energy? (a) joule (b) newton metre (c) kilowatt (d) kilowatt hour

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

(a) joule

(b) newton metre

(c) kilowatt

(d) kilowatt hour

Answers (1)

Answer:  [C]

Solution.

We know that work done and energy have same unit.
The SI unit of energy is Joule.
Work done is defined as product of force and displacement; therefore, its unit will be newton meter.
W=Fd\cos \theta
Power is defined as work done per unit time, and its unit will be watt or kilowatt.
If we multiply power with time, we will get energy or work done.
Therefore, kilowatt-hour will be the unit of energy.
[Only kilowatt is the unit of power, and that is not unit of energy.]
Correct answer of this question is option C.

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