P1B 0.0 / 5 ? PhysicsKeeping homes warmGCSEOCR Created by: ellxeCreated on: 30-04-16 22:04 What are things that emit energy called? Sources 1 of 5 What are things that transfer and waste or lose energy called? Sinks 2 of 5 Payback time is the money you've saved equalling the initial cost. What is the equation? Payback time = initial cost/annual saving 3 of 5 What does a thermogram do? Shows places of different temperatures in different colours e.g. to show where houses lose heat 4 of 5 Efficiency equation? Efficiency = useful energy output / total energy input (x100%) 5 of 5
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