Electrical appliances can transfer electrical energy into useful energy at the flick of a switch.
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What do we use most everyday electrical appliances for?
Uses of everyday electrical appliancesincluding heating, lighting, making an object move and creating sound and visual images.
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How do we choose an electrical appliance for a particular job?
An electrical appliance appliance is designed for a particular purpose and should waste as little energy as possible.
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What do we mean by power?
Power is rate of transfer of energy.
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How can we calculate the power of an appliance?
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How can we calculate the efficiency of an appliance in terms of power?
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How does how powerfull the appliance is affect the rate at which it transfers energy?
The more powerful an appliance, the faster at which it transfers energy.
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What is the kilowatt-hour?
The kilowatt-hour is the energy supplied to a 1kW applaince in 1 hour.
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How can we work out the energy used by a mains appliance?
E = P x t
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How is the cost of mains electricty worked out?
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What do we mean by cost effectiveness?
Cost effectiveness means getting the best value for money.
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How can we compare the cost effectiveness of different energy-saving measures?
To compare the cost effectiveness of different appliances, we need to take account of costs to buy it, running costs and other costs such as environmental costs.
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What might the environmental costs include?
The removal or disposal of old equipment and environmental taxes.
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Other cards in this set
Card 2
Front
What do we use most everyday electrical appliances for?
Back
Uses of everyday electrical appliancesincluding heating, lighting, making an object move and creating sound and visual images.
Card 3
Front
How do we choose an electrical appliance for a particular job?
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