A-LevelPhysicsD.C. circuits9702/12 · May/June 2018 · Q371 Mark

A thermistor is an electrical component with a resistance that varies with temperature. A thermistor T is used in a fire alarm system. The alarm is triggered when the potential difference between X and Y is 4.5 V. [Diagram] What is the resistance of T when the alarm is triggered?

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A90 Ω

B150 Ω

C250 Ω

D400 Ω

✓ Correct answer

C: 250 Ω

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2018 Paper 1 Variant 2, question 37.

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