MYP Physics · 19 · multiple choice
Choose the protection for a damaged appliance
Physics in society · Original GioPhysics question with a detailed, mark-by-mark answer guide.
- Demand
- recall
- Marks
- 3
- Topics
- 1
- Answer
- Complete
A metal-cased appliance develops a fault that connects its live wire to the case. Which protection is designed to provide a low-resistance path that helps a large fault current operate the protective device?
- A
The earth wire
- B
The plastic switch label
- C
A thicker live wire only
- D
A higher-power appliance
- a
Select and explain Select the protection and explain how it reduces electric-shock risk.
3 marks
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a
Select and explain Select the protection and explain how it reduces electric-shock risk.
Predict from the governing principle before looking for a matching option. Then reject alternatives by checking direction, units, limiting behaviour or the physical meaning of each statement.
- 1
Selects A, the earth wire.
- 2
Explains that the earth connection keeps the case near Earth potential and provides a low-resistance fault path.
- 3
Explains that the resulting large current operates a fuse or circuit breaker, disconnecting the supply.
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