Energy and Effciency 3.0 / 5 based on 1 rating ? PhysicsEnergyGCSEAQA Created by: CurlotCreated on: 03-07-13 17:44 Energy Can't be ..... Created or destroyed 1 of 11 Energy can be... Transferred and usually stored 2 of 11 Wasted energy becomes increasingly spread out and so... Warms it's surroundings 3 of 11 A light bulb transfroms electrical energy into... Light energy 4 of 11 But most energy is wasted beacuse... The bulb becomes very hot 5 of 11 A diagram that shows the relative proportions of energy transfer is called... A Sankey Diagram 6 of 11 The effiecincy of a device refers to the proportion of energy.... That is usefully transferred 7 of 11 The greater the proportion of energy that is usefully transferred the more efficient and cost effective a device is. 8 of 11 Pay back time can be calculated as £600/£60 per year=10 years 9 of 11 Effiecincy values are normally expressed as Either a percentage or a decimal 10 of 11 Effiecincy can be calculated by using this equation. Efficiency = ufeful energy or useful power out/ total energy x 100% 11 of 11
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