P1.3 ELECTRICAL ENERGY 0.0 / 5 ? PhysicsEnergyElectricityP1Core physicsGCSEAQA Created by: 12dalelCreated on: 11-11-16 16:59 What is power? The amount of energy we transfer per second 1 of 7 What do we measure power in? Watts 2 of 7 Equation for calculating power Power= Energy/Time 3 of 7 Equation for efficiency Useful power out/ Total power in x100 4 of 7 What is the kilowatt-hour? The amount of energy transferred to a 1 kilowatt appliance in an hour 5 of 7 How to work out kilowatt- hours kWh (E)= Power x time (in hours) 6 of 7 What is payback time? How long it takes to save the same amount of money as the appliance cost 7 of 7
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