# Physics P1.3

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• Created by: Matty_G16
• Created on: 20-05-16 10:38
What useful energy transfer takes place in an electric drill?
Electrical energy to kinetic energy.
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Which electrical appliance usefully transfers electrical energy into light and sound energy?
A television/computer.
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How many watts are equivalent to 12 kilowatts?
12,000 W.
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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.
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How much electrical energy, in kWh, is transferred when a 9 kW shower is used for 15 minutes?
2.25 kWh.
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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.
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What might environmental costs include?
The removal or disposal of old equipment and environmental taxes.
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Loft insulation costs £600 including installation. It saves £80 per year on the fuel bill. How long is the payback time?
7.5 years.
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## Other cards in this set

### Card 2

#### Front

Which electrical appliance usefully transfers electrical energy into light and sound energy?

#### Back

A television/computer.

### Card 3

#### Front

How many watts are equivalent to 12 kilowatts?

### Card 4

#### Front

An electric motor transfers 48 kj of electrical energy into kinetic energy in 2 minutes. What is the useful power output of the motor?

### Card 5

#### Front

How much electrical energy, in kWh, is transferred when a 9 kW shower is used for 15 minutes?