A-LevelPhysicsD.C. circuitsMay/June 2011Paper 1 Q371 Mark
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?
Ap.d. across resistor: decreased, p.d. across LDR: increased
Bp.d. across resistor: increased, p.d. across LDR: decreased
Cp.d. across resistor: no change, p.d. across LDR: increased
Dp.d. across resistor: no change, p.d. across LDR: decreased
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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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