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
Question 1
What is the difference between ac and dc?
- A. ac comes from batteries
- B. there is no difference
- C. dc is used in mains sockets
- D. ac keeps reversing direction; dc flows in one direction only
Question 2
Mains electricity: which statement is NOT true?
- A. The earth wire only carries current when there is a fault.
- B. A battery supplies alternating current.
- C. The fuse is connected in the live wire.
- D. Double-insulated appliances do not need an earth wire.
Question 3
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
Question 4
Why is it dangerous to touch the live wire even if the appliance is switched off at the switch?
- A. The switch makes the voltage higher
- B. The live wire is still at a high voltage, so current could flow through you to earth
- C. The live wire is always cold
- D. It is not dangerous
Question 5
Mains electricity: which statement is NOT true?
- A. Double-insulated appliances do not need an earth wire.
- B. The fuse is connected in the live wire.
- C. A battery supplies alternating current.
- D. The earth wire only carries current when there is a fault.
Question 6
In a UK three-pin plug, which wire is this: is dangerous even when a switch is off?
- A. live wire
- B. neutral wire
- C. earth wire
Question 7
What are the UK mains voltage and frequency?
- A. 12 V and 50 Hz
- B. 120 V and 60 Hz
- C. 230 V and 50 Hz
- D. 230 V and 0 Hz
Question 8
Mains electricity: which statement is NOT true?
- A. A battery supplies alternating current.
- B. Mains electricity in the UK is alternating current.
- C. The earth wire only carries current when there is a fault.
- D. Double-insulated appliances do not need an earth wire.
Question 9
In a UK three-pin plug, which wire is this: stops a metal case becoming live?
- A. live wire
- B. neutral wire
- C. earth wire
Question 10
What is the difference between ac and dc?
- A. dc is used in mains sockets
- B. ac keeps reversing direction; dc flows in one direction only
- C. ac comes from batteries
- D. there is no difference
Question 11
Mains electricity: which statement is NOT true?
- A. The earth wire is coloured blue.
- B. The earth wire only carries current when there is a fault.
- C. Double-insulated appliances do not need an earth wire.
- D. The fuse is connected in the live wire.
Question 12
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
Question 13
What are the UK mains voltage and frequency?
- A. 230 V and 0 Hz
- B. 120 V and 60 Hz
- C. 230 V and 50 Hz
- D. 12 V and 50 Hz
Question 14
Mains electricity: which statement is NOT true?
- A. Double-insulated appliances do not need an earth wire.
- B. The earth wire only carries current when there is a fault.
- C. The fuse is connected in the live wire.
- D. The neutral wire is at 230 V.
Question 15
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
Question 16
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. It is not dangerous
- C. The switch makes the voltage higher
- D. The live wire is always cold
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