physics 0.0 / 5 ? PhysicsAstronomyGCSEAQA Created by: Lewys ThomsonCreated on: 11-06-15 08:50 Is all of the energy transfered when an appliance is used? No it its not, some energy is wasted. 1 of 5 What does payback time mean? The cost of which it is to payback the cost of a device e.g double glased windows. 2 of 5 What is the equastion for working out payback time? paybacktime(years) = cost of instillation(£) divided by savings per year in fuel costs(£). 3 of 5 Can you name 1 way which waste energy is useful? heat exchanges. 4 of 5 What energy transfer would take place in a kettle? conduction, the kettle will heat the water, but some will be 'waste' energy. 5 of 5
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