Rev. Notes > IGCSE > Energy, Work and Power Previous Topic Energy, Work and Power Next Topic Topics
 Energy Kinetic energy Potential energy Different types of energy Law of conservation of energy Energy resources Work Power

## Law of conservation of energy

This law states that “energy can not be created or destroyed”.

It can be changed from one form to another form, but total energy is always canserved.

The total energy at the start and at the end of any system must have the same value.

For example, the train takes electrical energy and converts it mainly into K.E, but also into sound and internal energy.

We can also use this principal to observe what happens when K.E and P.E are converted from either one to the other.

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