A-LevelPhysicsD.C. circuits9702/12 · Feb/Mar 2022 · 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?

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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

A: Lamp P emits four times as much power as lamp Q.

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2022 Paper 1 Variant 2, question 31.

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