Electrical energy 0.0 / 5 ? PhysicsElectricityGCSEAQA Created by: Sam EvansCreated on: 23-05-14 20:11 What is the useful energy transfer in an electric toaster? Electrical energy heating bread 1 of 8 How may energy be wasted in an electric heater? As light from the glowing filament 2 of 8 How may energy be wasted in an electric kettle? Heating the body of the kettle itself and sound 3 of 8 How many kilowatts are equivalent to 30000 watts? 30kw 4 of 8 Which is more powerful, a 2000w hairdryer or a 2.2 kw hairdryer? 2.2 kw 5 of 8 What quantity is measured in kilojoules? Energy is measured in kilojoules 6 of 8 An electric light bulb transfers 6000J of energy in 1 minute. What is its power? 100w 7 of 8 Why is the electrical energy supplied by the mains measured in kilowatt-hours? The joule is too small to be useful in this situation 8 of 8
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