A-LevelPhysicsD.C. circuitsOct/Nov 2010Paper 1 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?
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
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The correct answer is B. This question tests the candidate's understanding of d.c. circuits within the Physicssyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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