A-LevelPhysicsD.C. circuits9702/12 · Oct/Nov 2010 · Q361 Mark

The diagram shows a potential divider circuit. [Figure showing a potential divider circuit with an LDR and a fixed resistor in series across a voltage source. The output voltage is taken across the fixed resistor.] The light level increases. What is the effect on the resistance of the light-dependent resistor (LDR) and on the output voltage?

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Aresistance of the LDR: decreases, output voltage: decreases

Bresistance of the LDR: decreases, output voltage: increases

Cresistance of the LDR: increases, output voltage: decreases

Dresistance of the LDR: increases, output voltage: increases

✓ Correct answer

B: resistance of the LDR: decreases, output voltage: increases

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2010 Paper 1 Variant 2, question 36.

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