A-LevelPhysicsD.C. circuitsOct/Nov 2010Paper 1 Q371 Mark
Three resistors, with resistances R₁, R₂ and R₃, are connected in series and are found to have a combined resistance of 500 Ω. When connected in parallel, the combined resistance is found to be 50 Ω. Which values will correspond to these results?
AR₁/Ω: 160, R₂/Ω: 160, R₃/Ω: 80
BR₁/Ω: 200, R₂/Ω: 200, R₃/Ω: 100
CR₁/Ω: 225, R₂/Ω: 225, R₃/Ω: 50
DR₁/Ω: 230, R₂/Ω: 230, R₃/Ω: 40
✓ Correct Answer
The correct answer is B: R₁/Ω: 200, R₂/Ω: 200, R₃/Ω: 100
📋 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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