A-LevelPhysicsD.C. circuits9702/12 · Oct/Nov 2010 · Q331 Mark

A battery of e.m.f. 12 V and internal resistance 2.0 Ω is connected in series with an ammeter of negligible resistance and an external resistor. External resistors of various different values are used. [Figure showing a battery with internal resistance, connected to an ammeter and an external resistor.] Which combination of current and resistor value is not correct?

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Acurrent/A: 1.0, external resistor value/Ω: 10

Bcurrent/A: 1.2, external resistor value/Ω: 8

Ccurrent/A: 1.5, external resistor value/Ω: 6

Dcurrent/A: 1.8, external resistor value/Ω: 4

✓ Correct answer

D: current/A: 1.8, external resistor value/Ω: 4

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2010 Paper 1 Variant 2, question 33.

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