Physics P1.3 0.0 / 5 ? PhysicsEnergyGCSEAQA Created by: Matty_G16Created on: 20-05-16 10:38 What useful energy transfer takes place in an electric drill? Electrical energy to kinetic energy. 1 of 8 Which electrical appliance usefully transfers electrical energy into light and sound energy? A television/computer. 2 of 8 How many watts are equivalent to 12 kilowatts? 12,000 W. 3 of 8 An electric motor transfers 48 kj of electrical energy into kinetic energy in 2 minutes. What is the useful power output of the motor? 400 W. 4 of 8 How much electrical energy, in kWh, is transferred when a 9 kW shower is used for 15 minutes? 2.25 kWh. 5 of 8 The price of 1 kWh of electrical energy is 9p. How much does it cost to use a 60 W electric light for 4 hours? 2.16p. 6 of 8 What might environmental costs include? The removal or disposal of old equipment and environmental taxes. 7 of 8 Loft insulation costs £600 including installation. It saves £80 per year on the fuel bill. How long is the payback time? 7.5 years. 8 of 8
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