Energy 0.0 / 5 ? PhysicsEnergyIGCSEAQA Created by: erinboyleCreated on: 08-12-13 22:16 Conduction occurs in ... Solids 1 of 23 What type of materias are the best conductors? Metals 2 of 23 Examples of good insulators are... Wool and Fibreglass 3 of 23 What is the main cause of conduction in Metals? Free Electrons 4 of 23 Why are non-metals poor conductors? They don't have free electrons 5 of 23 Convection occurs in ... Liquids and Gases 6 of 23 what is convection? the circulation of a fluid caused by heating 7 of 23 what causes convection? heating a fluid makes it less dense so it rises and circulates 8 of 23 Radiation is an... Electromagnetic wave- INFRA RED 9 of 23 where does radiation occur? in all objects 10 of 23 what is a the electromagnetic wave called? Infra red radiation 11 of 23 The warmer an object is the... Greater the amount of Radiation 12 of 23 The colder an object is the... Smaller the amount of Radiation 13 of 23 What type of surfaces are good emitters/absorbers of Radiation ? Dull & Dark 14 of 23 What type of surfaces are bad emitters/absorbers of Radiation ? Shiny & Light 15 of 23 What type of surfaces are good reflectors of Radiation? Shiny & Light 16 of 23 what type of surfaces are bad reflectors of Radiation? Dull & Dark 17 of 23 What are U Values? energy/per second --> 1 square m (when the temperature difference across it is 1° C) 18 of 23 the lower the U value the... better the insulator 19 of 23 payback time = cost to buy and install ÷ amount saved per year 20 of 23 specific heat capacity Q=sm∆t 21 of 23 specific heat capacity units are J/Kg °C 22 of 23 Q=sm∆t is Energy needed= specific heat capacity x mass x difference in temperature 23 of 23
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