A-LevelPhysicsD.C. circuits9702/12 · Oct/Nov 2011 · Q331 Mark

The graph shows the variation with potential difference (p.d.) of the current in a lamp filament. [Figure 33.1] Which statement explains the shape of this graph?

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AAs the filament temperature rises, electrons can pass more easily through the filament.

BIt takes time for the filament to reach its working temperature.

CThe power output of the filament is proportional to the square of the current in it.

DThe resistance of the filament increases with a rise in temperature.

✓ Correct answer

D: The resistance of the filament increases with a rise in temperature.

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2011 Paper 1 Variant 2, question 33.

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