Useful Energy 0.0 / 5 ? PhysicsEnergyGCSEAQA Created by: Mr_MackintoastCreated on: 01-03-17 18:01 What is a machine? A machine is something that transfers energy from one place/form to another 1 of 7 What is useful energy? Energy which is transferred to the place we want it and in the form we want it. 2 of 7 What is wasted energy? Energy which is not usefully transferred 3 of 7 What happens to the wasted energy from a light bulb? It is transferred to the surroundings which get warmer 4 of 7 Why should we talk about energy being 'wasted' and not 'lost'? Because the law of conservation tells us that energy can not be destroyed 5 of 7 Why is energy often wasted? Energy is often wasted because of friction between the moving parts of a machine. It becomes more difficult to use for further energy transfers. 6 of 7 Where is friction useful? Bicycle or car brakes. 7 of 7
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