A-LevelPhysicsD.C. circuits9702/12 · Oct/Nov 2012 · Q371 Mark

The ammeter reading in the circuit below is I. [Figure showing a simple circuit with a resistor R and ammeter A] Another circuit containing the same voltage supply, two switches, an ammeter and two resistors each of resistance R, is shown. [Figure showing a more complex circuit with two resistors R, two switches S1, S2, and an ammeter A] Which row is not correct? [Table with states of S1, S2 and ammeter reading]

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AS1 closed, S2 closed, ammeter reading I

BS1 closed, S2 open, ammeter reading I

CS1 open, S2 closed, ammeter reading I

DS1 open, S2 open, ammeter reading 0

✓ Correct answer

C: S1 open, S2 closed, ammeter reading I

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2012 Paper 1 Variant 2, question 37.

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