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Physics (AS & A Level) · May / June 2018 · Paper 12 · Question 37

9702Potential dividers

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. What is the resistance of T when the alarm is triggered?

  1. A90 Ω
  2. B150 Ω
  3. C250 Ω
  4. D400 Ω

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Correct answer: C. 250 Ω

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