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Paper 1
Topic 2: Electricty
Mains Electricity
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Cards (25)
What type of current is mains electricity in the UK?
Alternating current
(AC)
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What is the frequency of alternating current in the UK?
50 Hertz
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What is the potential difference of mains electricity in the UK?
230
volts
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How are electrical appliances connected to mains electricity?
Using
three core cable
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What material are the wires in a three core cable made of?
Copper
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What is the purpose of the plastic coating on the wires?
It prevents
electrical
conduction
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What is the brown wire in a three core cable called?
Live wire
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What potential difference does the live wire carry?
230
volts
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What is the blue wire in a three core cable called?
Neutral wire
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What is the potential difference of the neutral wire?
Around
zero volts
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What is the green and yellow striped wire called?
Earth wire
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What is the function of the earth wire?
It provides safety by
grounding
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Why is the live wire dangerous?
It can be
fatal
if touched
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What happens if someone touches the live wire?
A
current
flows through them to
earth
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Why can appliances with metal cases be dangerous?
If the
live wire
touches the case
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How does the earth wire protect against electric shock?
It directs current safely to the
ground
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What happens if the live wire comes loose in a metal-cased appliance?
The case can become
live
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What occurs when a live case is touched?
A
fatal
electric shock can happen
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What does the fuse do in an electrical circuit?
It melts and shuts off the
current
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What are the functions of the live wire, neutral wire, and earth wire?
Live wire: Carries current at
230 volts
Neutral wire: Completes the circuit at 0 volts
Earth wire: Provides safety by grounding
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What should you learn about the fuse symbol?
It represents the fuse in a
circuit
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What is the potential difference of the earth?
Zero
volts
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What is the significance of the three core cable in electrical appliances?
It ensures
safe
operation
of appliances
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How does the function of the earth wire differ from the live wire?
The earth wire is for safety, live carries
current
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What is the role of the neutral wire in a circuit?
It completes the circuit with the
live wire
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