O-LevelPhysicsElectricity5054/11 · Oct/Nov 2014 · Q341 Mark

In the circuit shown, resistors X and Y act as a potential divider to control the speed of a motor. What is the reason for the potential divider?

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Ato vary the direction of the current in X

Bto vary the e.m.f. of the battery

Cto vary the potential difference across the motor

Dto vary the resistance of the motor

✓ Correct answer

C: to vary the potential difference across the motor

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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 34.

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