Law of Conservation of Energy (L.O.C.E)
Energy can not be created or destroyed. However, it can be transferred/changed from one energy form to another.
Example #1:
When bowling pins are still on the lane they have potential energy which changes to kinetic energy when the bowling ball knocks them down.
>>> 
Potential Energy >>> Kinetic Energy
Example #2:
A radio uses electrical energy and changes to sound energy when turned on.
>>>
Electrical Energy >>> Sound Energy
