AQA P1.3 The usefulness of electrical appliances 4.5 / 5 based on 3 ratings ? PhysicsEnergyGCSEAQA Created by: RchildsCreated on: 15-05-17 21:46 What does the amount of electrical energy transferred by a device depend on? (1) It's power (2) how long it is on for 1 of 5 What is power? The RATE of energy transfer 2 of 5 What is the unit of power? The Watt (W) 3 of 5 Energy = power x time (formula given). What does power and time need to be measured in so energy's unit is (a) kWh and (b) J (a) Power in kW, time in hours (b) power in Watts, time in seconds 4 of 5 How do you calculate the cost of running an electrical appliance (formula NOT given - memorize)? Cost = power in kW x time in hours x cost per kWh (cost per kWh will be given in the question) 5 of 5
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