Energy transfers and efficiency 1.0 / 5 based on 1 rating ? PhysicsEnergyIGCSEAQA Created by: chessiewoodCreated on: 30-03-15 10:12 Conservation of energy energy cannot be created or destroyed 1 of 14 Investigating energy changes- Pendulum the energy of a swinging pendulum changes from gpe to kinetic energy when it swings. 2 of 14 Energy stores elastic energy, gravitational potential energy, light, sound, kinetic, electrical, chemical and nuclear. 3 of 14 Useful energy is energy in the place we want it and the form we need it 4 of 14 Wasted energy is energy that is not useful energy 5 of 14 What happens to wasted energy? its is eventually transferred to the surroundings, which become warmer. This also happens to useful energy. 6 of 14 what happens to energy when it dissipates? dissipates= spread out. The energy gets less and less useful 7 of 14 Sankey diagram represents the energy flow through a system. it shows useful and wasteful energy. 8 of 14 Why machines waste energy? Friction, resistance, air resistance and sound. 9 of 14 How to reduce this problem? lubrication, wires with little resistance, streamline objects, cut out noise- tighten loose parts. 10 of 14 The rate of energy transfers to or from our homes can be reduced by.. loft insulation, cavity wall insulation, double glazing, draught proofing and aluminium foils behind radiators. 11 of 14 The U-value of a materia how much energy per second passes through it. The lower the u-value the better the insulator 12 of 14 solar heating pannel? sun radiation heats water. Cheap to run but expensive to buy. 13 of 14 Payback time? the time taken to recover the cost of buying and installing the device from the savings on the energy bills. 14 of 14
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