AQA P1.3 The usefulness of electrical appliances

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  • Created by: Rchilds
  • Created on: 15-05-17 21:46
What does the amount of electrical energy transferred by a device depend on?
(1) It's power (2) how long it is on for
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What is power?
The RATE of energy transfer
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What is the unit of power?
The Watt (W)
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Energy = power x time (formula given). What does power and time need to be measured in so energy's unit is (a) kWh and (b) J
(a) Power in kW, time in hours (b) power in Watts, time in seconds
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How do you calculate the cost of running an electrical appliance (formula NOT given - memorize)?
Cost = power in kW x time in hours x cost per kWh (cost per kWh will be given in the question)
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Other cards in this set

Card 2

Front

What is power?

Back

The RATE of energy transfer

Card 3

Front

What is the unit of power?

Back

Preview of the front of card 3

Card 4

Front

Energy = power x time (formula given). What does power and time need to be measured in so energy's unit is (a) kWh and (b) J

Back

Preview of the front of card 4

Card 5

Front

How do you calculate the cost of running an electrical appliance (formula NOT given - memorize)?

Back

Preview of the front of card 5

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