A-LevelPhysicsD.C. circuitsFeb/Mar 2020Paper 1 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?
A3 0.2
B3 0.4
C21 0.2
D21 0.4
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The correct answer is B. This question tests the candidate's understanding of d.c. circuits within the Physicssyllabus. The examiner's mark scheme requires...
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