Physics 0.0 / 5 ? PhysicsEnergyGCSEAQA Created by: Lewys ThomsonCreated on: 11-05-15 19:51 can you name 3 ways which energy can be transferred? Conduction, convection, radiation. 1 of 8 What is a heat sink? Anything that is cooler than its surroundings (absorbs heat). 2 of 8 What is a U-value? A U-value is a measure of how fast a material loses heat. the lower the U-value the better the insulator. 3 of 8 What is Payback time? payback time (years) = cost of installation (£) ÷ savings per year in fuel costs (£) 4 of 8 What is a Vacuum flask? a container that keeps a substance hot or cold by means of a double wall enclosing a vacuum e.g triple glazed windows. 5 of 8 How can heat transfer rates be altered in a building? triple glazed windows, loft insulation, fit carpet, fit cavity wall insulation. 6 of 8 what is the specific heat capacity of water? 4200 Jules per kg 7 of 8 what is the specific heat capacity of oxygen? 0.918 Jules per kg 8 of 8
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