(P2) Fuel for power

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• Created by: Anjelala
• Created on: 19-05-13 21:11
What do electrical appliances normally display power rating in?
Watts (W) and Kilowatts (KW)
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What is the equation to work out power?
Voltage x Current = Power
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What is the equation to work out energy supplied?
Power x Time = energy supplied
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What is Kilowatt-hour (kWh) ?
The unit of electrical energy used in the home
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What is the equation to work out the cost of electricity used?
energy used x cost per kWh = cost of electricity used
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How does the cost of electricity change at night?
Electricity is cheaper at night when not as much is needed .
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What 4 things do the choice of elctricity depend on?
1) Availability 2) ease of extraction 3) effect on the environment 4) associated risks.
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What is the national grid?
A series of transformers and power lines that transport electricity from the power station to the consumer.
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What 2 things are transformers used to do? ( In the national grid)
> step up the voltage to as high as 4000 000 V. >Then step down the voltage to a more suitable level for the consumer.
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What 3 things can high Voltage lead to? ( National Grid)
1) reduced energy loss 2) reduced distribution costs 3) cheaper electricity for consumers.
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What hapens to a wire when a current passes it?
The wire gets hot.
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Th greater the current ....( finish the sentence)
The greater the current, the hotter the wire.
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When a transformer increases the voltage, what happens to the current?
The current is reduced so there is less heating effect meaning less energy is lost to the environment.
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Other cards in this set

Card 2

Front

What is the equation to work out power?

Back

Voltage x Current = Power

Card 3

Front

What is the equation to work out energy supplied?

Back Card 4

Front

What is Kilowatt-hour (kWh) ?

Back Card 5

Front

What is the equation to work out the cost of electricity used?

Back 