Using Energy 0.0 / 5 ? PhysicsEnergyGCSEAQA Created by: MaddiCreated on: 10-04-14 15:27 What forms of energy are there? Magnetic, Kinetic, Heat, Light, Gravitational potential, Chemical, Sound, Eletrical, Elastic potential and Nuclear. 1 of 9 What do we mean by 'conservation of energy'? Energy cannot be created or destroyed. 2 of 9 Why is the conservation of energy such an important idea? Conservation of energy applies to all energy changes. 3 of 9 What is 'useful' energy? Useful energy is energy transferred in the place we want it and in the form we need it. 4 of 9 What do we mean by 'wasted' energy? Wasted energy is energy that is not usefully transferred. 5 of 9 What eventually happens to wasted energy? Useful and wasted energy both end up being transferred to the surroundings, which become warmer. 6 of 9 Does energy become less useful after we use it? As energy spreads out it gets more and more difficult to use for further energy transfers. 7 of 9 How efficient can a machine be? A machine cannot be more than 100% efficient. 8 of 9 How can we make machines more efficient? Measures to make machines more efficient iclude reducing friction, air resistance, electrical resistance and noise due to vibrations. 9 of 9
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