They are used to supply electricity from the National Grid to consumers.
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Why is the National Grid an efficient way to transfer electricity?
Due to the large voltage, less current is needed to transfer the same amount of power. Therefore, power loss is reduced because the resistance heating in the cables is reduced.
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Why does the current in a mains appliance alternate?
The mains supply provides an alternating voltage between the two wires
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How much electricity does a power station generate?
25 000 V
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Why are step-up transformers used?
They are used at power stations to transfer electricity to the National Grid. They usually make the voltage bigger.
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What is an oscilloscope used for?
It shows how alternating potential difference changes with time.
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What is the equation for frequency?
1/time taken for one cycle
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Other cards in this set
Card 2
Front
Why is the National Grid an efficient way to transfer electricity?
Back
Due to the large voltage, less current is needed to transfer the same amount of power. Therefore, power loss is reduced because the resistance heating in the cables is reduced.
Card 3
Front
Why does the current in a mains appliance alternate?
Back
Card 4
Front
How much electricity does a power station generate?
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