A-LevelPhysicsD.C. circuits9702/12 · May/June 2020 · Q361 Mark

A cell of electromotive force (e.m.f.) E and internal resistance 0.50 Ω is connected to a resistor of resistance 4.7 Ω. [Figure 36.1] The maximum power that can be dissipated by the resistor without overheating is 0.50 W. What is the maximum value of E for the resistor not to overheat?

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A1.4 V

B1.5 V

C1.7 V

D2.9 V

✓ Correct answer

C: 1.7 V

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2020 Paper 1 Variant 2, question 36.

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