Sustainable Living: 3M FuturewiseTown PlanIntroductionGo BackGo Next3M

Energy types

Energy transformations

Energy is never lost but some forms of energy are
more useful than others

In a light bulb, energy changes from electrical energy into heat and light energy. The light energy is the useful energy change – the type of energy we want from a light bulb. The heat energy is not wanted and we call that lost or wasted energy.

Electricity is a very useful energy because it can be turned into lots of other energy types and it can travel over long distances. But electricity cannot be stored so it has to be generated as it is needed.

Heat energy is not as useful because, once it is created, it is hard to change into any other form of energy.