Question

Which of the following colors is not a unit of energy?
$(A)Ws$
$(B)Kgm{s^{ - 1}}$
$(C)Nm$
$(D)Joule$

Answer 1

The ability to work is defined as energy. Energy can not be formed or destroyed. It can only be changed from one type to the next.
There are several sorts of energy because they can be found in a variety of objects.
There are two types of energy: kinetic and potential. Kinetic Energy is the energy stored in an object and is measured by the amount of work done, whereas Potential Energy is the energy stored in a thing and is measured by the amount of work done.

Complete step-by-step solution:
Energy is given by
Work Done = Energy = Displacement $\times$ Time
$E = Fd$
Joule is the unit of energy that is the same for the Work.
Option $(A)$ -> Watt-second (symbol $Ws$) is a derived unit of energy equivalent to the joule. The watt-second is the energy defined as the equivalent energy of one watt of the power gained in one second.
Option $(B)$ -> Kg-m/sec or $Kgm{s^{ - 1}}$ is not a unit of energy. It is the unit of momentum (the product of mass and velocity)
Option $(C)$ -> Newton-meter symbolized as $Nm$ is a unit of energy, as $Joule = Nm$.
Option $(D)$ -> $Joule$ is a unit of energy.
Hence, the option $(B)$ is the correct answer.

Note: There are also two types of energy sources: renewable energy sources and non-renewable energy sources.
Examples of renewable energy sources are solar power, wind energy, and heat. On the other hand, natural gas, coal, and petroleum products are non-renewable sources.
One of the fundamental rules of physics is the law of conservation of energy. “The complete energy of the system will be conserved in a closed and separated system from its surroundings,” it says. As a result, energy cannot be generated or destroyed, but only converted from one form to another.