A-LevelPhysicsD.C. circuitsFeb/Mar 2022Paper 1 Q311 Mark
In the circuit shown, lamp P is rated 250 V, 50 W and lamp Q is rated 250 V, 200 W. The two lamps are connected in series to a 250 V power supply. [Figure 31.1] Assume that the resistance of each lamp remains constant. Which statement most accurately describes what happens when the switch is closed?
ALamp P emits four times as much power as lamp Q.
BLamp P emits twice as much power as lamp Q.
CLamp Q emits four times as much power as lamp P.
DLamp Q emits twice as much power as lamp P.
✓ Correct Answer
The correct answer is A: Lamp P emits four times as much power as lamp Q.
📋 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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