Question

what is the need and importance of energy transformation

Answer 1

For example- We humans eat food to store potential chemical energy.We use this energy by converting it to useful kinetic energy when we walk or move in any way,and also sound energy when we talk.Heat energy is produced all the time as a waste, and radiates from our body even more when we work or put more stress.

Answer 2

Answer:

Because it is very often naturally occourring or requested in human activities.

Explanation:

For example, in the Sun, nuclear energy is converted in electromagnetic energy in natural manner because the system must go to a future equilibrium. 
Or for human activities... in a loudspeaker, the electromagnetic energy is converted in mechanic energy and in acoustic wave because we want to hear recorded music or voices.
To close, also a falling ball is a very simple example of energy conversion (potential to kinetic).


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@hermoinegranger 7