A-LevelPhysicsD.C. circuits9702/12 · May/June 2011 · Q351 Mark

Which graph best represents the way in which the current I through a thermistor depends upon the potential difference V across it?

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AI-V graph, curve bending upwards from the origin (slope dI/dV increases)

BI-V graph, straight line through origin with positive slope

CI-V graph, curve bending downwards from the origin (slope dI/dV decreases)

DI-V graph, curve bending upwards from the origin, but with overall decreasing slope towards the end

✓ Correct answer

A: I-V graph, curve bending upwards from the origin (slope dI/dV increases)

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2011 Paper 1 Variant 2, question 35.

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