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CAIE A-Level Physics AS 10.3.4 The Use of Thermistors and Light Dependent Resistors in Potential Dividers Questions

Explain the use of thermistors and LDRs in potential-divider circuits.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • Explain the use of thermistors and LDRs in potential-divider circuits.

CAIE A-Level Physics AS 10.3.4 The Use of Thermistors and Light Dependent Resistors in Potential Dividers Questions question 1

[Maximum number: 1]

The diagram shows a circuit with a battery of electromotive force (e.m.f.) 60 V and negligible internal resistance, a 20kΩ20 \mathrm{k} \Omega resistor, a thermistor and a voltmeter. The resistance of the thermistor is 20kΩ20 \mathrm{k} \Omega.

Figure for Question CAIE A-Level Physics AS 10.3.4 The Use of Thermistors and Light Dependent Resistors in Potential Dividers Questions question 1 — CAIE A-Level Physics AS

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?
A 20 V
B 24 V
C 36 V
D 40 V

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