Physics #2 0.0 / 5 ? PhysicsKeywordsGCSEAQA Created by: Mr AFTWCreated on: 08-01-16 23:20 The theory that energy cannot be created or destroyed, only transferred. Conservation of energy 1 of 7 Saves more money that it costs Cost Effective 2 of 7 Useful energy transferred by the device divided by total energy supplied to the device. Efficiency 3 of 7 Electrical energy supplied to a 1 kW electrical device in 1 hour. Kilowatt Hour / Unit 4 of 7 A measure of thermal transmittance through a material. U-Value 5 of 7 A measure of power equal to one joule of work per second. Watt 6 of 7 The time it takes to save the money spent on insulating a building Payback Time 7 of 7
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