Physics - Energy and Efficiency 0.0 / 5 ? PhysicsEnergyGCSEAQA Created by: JennyCreated on: 18-05-13 17:03 what can never happen to energy? be destroyed 1 of 6 what happens to the energy that isnt 'useful'? it is wasted 2 of 6 what happens to the surroundings when energy is wasted? they warm up 3 of 6 what is the equation for efficiency? useful power out divided by total power in 4 of 6 what does payback time mean? the amount of time it takes to get your money back 5 of 6 what is the formula for payback time? cost of insulator divided by annual fuel saving 6 of 6
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