Science 0.0 / 5 ? ScienceEnergy and efficiencyGCSEEdexcel Created by: MeganELCreated on: 13-05-19 11:25 Name energy stores Chemical energy Kinetic energy Thermal energy Strain/elastic potential Atomic/nuclear 1 of 23 Name chemical energy stores Food Fuel Batteries 2 of 23 What’s kinetic energy Moving objects 3 of 23 What’s thermal energy Hot objects 4 of 23 What’s strain/elastic potential Stretched or squashed objects 5 of 23 Name energy transfers Electrical Light Sound Thermal Kinetic 6 of 23 Can energy be destroyed and created No 7 of 23 How does energy move It moves by being transferred from one form to another 8 of 23 Efficiency equation Efficiency = Useful energy transferred by device Divide by Total energy 9 of 23 How is energy stored Energy is stored due to an objects position in a gravitational field 10 of 23 Which objects have a store of GPE any object above the surface of the earth 11 of 23 What’s the equation for change inGPE Change in GPE= Mass (kg) x GFS (N/kg) x change in vertical height (m) 12 of 23 How is energy stored (kinetic) Energy is stored in moving objects (kinetic). Kinetic energy is stored in moving objects depends on its speed 13 of 23 Equation for calculating kinetic energy Kinetic = 1/2 x mass x (speed)2 14 of 23 What is energy measured in Joules 15 of 23 Work the GPE our - airplane flying at 50 m/ s at 5 900 x 10x 500 = 4500000 joules 16 of 23 How does energy spread out It is dissipated to the surroundings 17 of 23 Is water a good or bad conductor Bad 18 of 23 Good insulator are a food or bad conductor (heat) Good insulators are a poor conductor of heat eg. Air particles are spread out so do not pass energy along 19 of 23 Why are polar bears furry To keep them warm. They have layers of fur with air trapped between them which act like an insulator 20 of 23 Does a good insulator have a good or bad thermal c Bad 21 of 23 What is thermal conductivity A measure of how easily easily energy is transferred through a material by heating 22 of 23 Rate of energy transfer is reduced by .... Increasing thickness Decreasing thermal conductivity Decreasing temperature difference 23 of 23
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