The diagram shows a fixed resistor and a light-dependent resistor (LDR) in series with a constant low-voltage supply. When the LDR is in the dark, the fixed resistor and the LDR have the same value of resistance. Light is shone on the LDR. What happens to the potential differences across the two components?
✓ Correct Answer
The correct answer is B: p.d. across resistor: increased, p.d. across LDR: decreased
📋 Examiner Report & Trap Analysis
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...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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