A-LevelPhysicsD.C. circuitsOct/Nov 2025Paper 1 Q351 Mark
The diagram shows a circuit with a battery of electromotive force (e.m.f.) 60 V and negligible internal resistance, a 20 kΩ resistor, a thermistor and a voltmeter. The resistance of the thermistor is 20 kΩ. [Figure 35.0] The temperature of the thermistor decreases, and this causes its resistance to change by 50%. After this change, what is the reading on the voltmeter?
A20 V
B24 V
C36 V
D40 V
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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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