A-LevelPhysicsD.C. circuits9702/12 · Feb/Mar 2020 · Q351 Mark

Two batteries are connected together, as shown. [Figure showing battery 1 (12 V, 0.3 Ω internal resistance) and battery 2 (9 V, 0.1 Ω internal resistance) connected in series, with their positive terminals connected together] Battery 1 has electromotive force (e.m.f.) 12 V and internal resistance 0.3 Ω. Battery 2 has e.m.f. 9 V and internal resistance 0.1 Ω. What are the e.m.f. and the internal resistance of a single battery that has the same effect as the combination?

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A3 0.2

B3 0.4

C21 0.2

D21 0.4

✓ Correct answer

B: 3 0.4

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2020 Paper 1 Variant 2, question 35.

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