O-LevelPhysicsElectricity5054/12 · Oct/Nov 2019 · Q361 Mark

A mains electric circuit is fitted with a circuit breaker rather than a fuse. Where is the circuit breaker connected and what happens when the current is too large?

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Athe live wire. a thin wire melts and breaks the circuit.

Bthe live wire. an electromagnet opens a switch.

Cthe neutral wire. a thin wire melts and breaks the circuit.

Dthe neutral wire. an electromagnet opens a switch.

✓ Correct answer

B: the live wire. an electromagnet opens a switch.

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Topic: Electricity, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, Oct/Nov 2019 Paper 1 Variant 2, question 36.

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