O-LevelPhysicsElectricity5054/11 · Oct/Nov 2014 · Q281 Mark

With component X placed in the circuit below, the brightness of the lamp can be gradually reduced until it goes out. What is component X?

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Areed relay

Bswitch

Ctransformer

Dvariable resistor

✓ Correct answer

D: variable resistor

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Topic: Electricity, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, Oct/Nov 2014 Paper 1 Variant 1, question 28.

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