Physics (P1) - Electrical Energy

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  • Created by: Roma
  • Created on: 12-12-13 21:39
Why are electrical appliances useful?
They can transfer electrical energy into whatever form.
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What is the power of an appliance?
The rate at which it transfers energy.
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What is the unit of power?
Watt (W) - An appliance with a power of 1W transfers 1 joule of electrical energy to other forms of energy every second.
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How many Watts are there in a Kilowatt?
1000
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What is a kilowatt-hour?
The amount of energy that is transferred by a one-kilowatt appliance when used for one hour.
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What must you consider to compare the cost effectiveness of different appliances?
Cost to buy, cost to install, running costs, maintenance costs, environmental costs, interest charged on a loan to buy the appliance.
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What is 'payback time'?
The time taken for an appliance or installation to pay itself back in terms of energy savings.
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Other cards in this set

Card 2

Front

What is the power of an appliance?

Back

The rate at which it transfers energy.

Card 3

Front

What is the unit of power?

Back

Preview of the front of card 3

Card 4

Front

How many Watts are there in a Kilowatt?

Back

Preview of the front of card 4

Card 5

Front

What is a kilowatt-hour?

Back

Preview of the front of card 5
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