A-LevelPhysicsD.C. circuits9702/12 · Feb/Mar 2025 · Q321 Mark

A thermistor is connected to a cell with negligible internal resistance. [Figure 32.1] Which graph shows the variation with temperature of power, P, dissipated in the thermistor?

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AGraph A shows P increasing non-linearly with temperature, curving upwards.

BGraph B shows P decreasing non-linearly with temperature, curving downwards.

CGraph C shows P is constant with temperature.

DGraph D shows P decreasing linearly with temperature.

✓ Correct answer

A: Graph A shows P increasing non-linearly with temperature, curving upwards.

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2025 Paper 1 Variant 2, question 32.

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