A-LevelPhysicsD.C. circuits9702/12 · Feb/Mar 2021 · Q341 Mark

A fixed resistor and a diode are connected in series to a battery of electromotive force (e.m.f.) 6.0 V and negligible internal resistance. The graph shows the variation with potential difference (p.d.) V of the current I for the diode. [Figure 34.1] The current in the diode is 40 mA. What is the resistance of the fixed resistor?

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A30 Ω

B120 Ω

C150 Ω

D180 Ω

✓ Correct answer

B: 120 Ω

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2021 Paper 1 Variant 2, question 34.

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