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Description
Flashcards by nadine pownall, updated more than 1 year ago
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Created by nadine pownall
almost 8 years ago
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| Question | Answer |
| What useful energy transfer takes place in an electric drill ? | Electrical energy to Kinetic energy. |
| Which electrical appliance is usefully transfers electrical energy into light energy and sound energy ? | A television or computer. |
| How many watts are equivalent to 12 kilowatts ? | 12,000 W . |
| 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 . |
| How much electrical energy, in kWh, is transferred when a 9 kW shower is used for 15 minutes ? | 2.25 kWh . |
| 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 . |
| what might environmental costs include ? | The removal or disposal of old equipment and environmental taxes. |
| loft insulation costs £600 including installation. It saves £80 a year on the fuel bill. How long is the payback time ? | 7.5 years. |
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