O-LevelPhysicsElectricity5054/12 · May/June 2019 · Q331 Mark

The diagram shows a simple circuit. What happens when the resistance of the variable resistor is increased?

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AThe lamps are dimmer and the motor rotates more quickly.

BThe lamps are dimmer and the motor rotates more slowly.

CThe lamps have the same brightness and the motor rotates more quickly.

DThe lamps have the same brightness and the motor rotates more slowly.

✓ Correct answer

B: The lamps are dimmer and the motor rotates more slowly.

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Topic: Electricity, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, May/June 2019 Paper 1 Variant 2, question 33.

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