O Levels Physics (5054)•5054/11/O/N/19

Explanation
Electrical Safety in Mains Plugs Steps:
- The live wire supplies dangerous voltage to the lamp, so components must interrupt it for safety.
- The switch disconnects power when off, preventing shock by isolating the live wire.
- The fuse protects against overloads by breaking the live circuit if current exceeds safe levels.
- Both must connect to the live wire to fully de-energize the lamp.
Why C is correct:
- Live wire interruption by both switch and fuse follows electrical safety standards, ensuring no voltage reaches the lamp when off or during faults.
Why the others are wrong:
- A: Fuse on neutral fails to isolate live voltage, leaving the lamp potentially energized after fuse blow.
- B: Switch on neutral keeps live connected when off, risking electric shock.
- D: Neither interrupts live wire, so lamp remains hazardous at all times.
Final answer: C
Topic: Electrical safety
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