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Mains electricity, AC/DC and plug safety

9th grade (Year 10 in England) · 16 questions · Common Core: NGSS.HS-PS3-3 · England: GCSE Combined Science: Electricity (domestic uses and safety)

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Score/ 16

1
Question 1
In a UK three-pin plug, which wire is this: green and yellow stripes?
- A. live wire
- B. neutral wire
- C. earth wire
2
Question 2
What is the difference between ac and dc?
- A. dc is used in mains sockets
- B. there is no difference
- C. ac comes from batteries
- D. ac keeps reversing direction; dc flows in one direction only
3
Question 3
Mains electricity: which statement is NOT true?
- A. The fuse is connected in the live wire.
- B. Double-insulated appliances do not need an earth wire.
- C. The earth wire is coloured blue.
- D. Mains electricity in the UK is alternating current.
4
Question 4
In a UK three-pin plug, which wire is this: green and yellow stripes?
- A. live wire
- B. neutral wire
- C. earth wire
5
Question 5
What is the difference between ac and dc?
- A. ac comes from batteries
- B. ac keeps reversing direction; dc flows in one direction only
- C. there is no difference
- D. dc is used in mains sockets
6
Question 6
Mains electricity: which statement is NOT true?
- A. The earth wire only carries current when there is a fault.
- B. Mains electricity in the UK is alternating current.
- C. The fuse is connected in the live wire.
- D. The neutral wire is at 230 V.
7
Question 7
In a UK three-pin plug, which wire is this: brown insulation?
- A. live wire
- B. neutral wire
- C. earth wire
8
Question 8
Why is it dangerous to touch the live wire even if the appliance is switched off at the switch?
- A. It is not dangerous
- B. The live wire is always cold
- C. The live wire is still at a high voltage, so current could flow through you to earth
- D. The switch makes the voltage higher
9
Question 9
Mains electricity: which statement is NOT true?
- A. The neutral wire is at 230 V.
- B. The earth wire only carries current when there is a fault.
- C. The fuse is connected in the live wire.
- D. Mains electricity in the UK is alternating current.
10
Question 10
In a UK three-pin plug, which wire is this: completes the circuit at about 0 V?
- A. live wire
- B. neutral wire
- C. earth wire
11
Question 11
What is the difference between ac and dc?
- A. ac comes from batteries
- B. dc is used in mains sockets
- C. there is no difference
- D. ac keeps reversing direction; dc flows in one direction only
12
Question 12
Mains electricity: which statement is NOT true?
- A. Mains electricity in the UK is alternating current.
- B. Double-insulated appliances do not need an earth wire.
- C. The earth wire only carries current when there is a fault.
- D. A battery supplies alternating current.
13
Question 13
In a UK three-pin plug, which wire is this: blue insulation?
- A. live wire
- B. neutral wire
- C. earth wire
14
Question 14
Why is it dangerous to touch the live wire even if the appliance is switched off at the switch?
- A. The live wire is still at a high voltage, so current could flow through you to earth
- B. The switch makes the voltage higher
- C. It is not dangerous
- D. The live wire is always cold
15
Question 15
Mains electricity: which statement is NOT true?
- A. Double-insulated appliances do not need an earth wire.
- B. The earth wire is coloured blue.
- C. Mains electricity in the UK is alternating current.
- D. The earth wire only carries current when there is a fault.
16
Question 16
In a UK three-pin plug, which wire is this: completes the circuit at about 0 V?
- A. live wire
- B. neutral wire
- C. earth wire

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