Question

Which of the following is a unit of energy?

• A. $\text{Joule}$
• B. $kg\text{-}m/sec$
• C. $N\text{-}m$
• D. $W\text{-}s$

Answer 1

The correct option is C $N\text{-}m$

$\text{Energy}=\text{power}\times \text{time}$
The SI unit of energy is joule.
The SI unit of power is watt.
According to above formula the unit of energy is given by, $W\text{-}s$
Now, work is equal to the energy and
$\text{Work}=\text{force}\times \text{displacement}$
Hence, unit of energy also given as $N\text{-}m$