plumiPotential dividers with thermistors and LDRs: Edexcel International A Level Physics questions
Edexcel International A Level Physics past-paper questions on 2.4.3.2 Potential dividers with thermistors and LDRs, 2019–2025, with mark schemes and examiner’s reports where available.
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Q16(a)
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Open the full PDFYour answerQ15(c)(i)
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All 19 questions on Potential dividers with thermistors and LDRs, as a list
- June 2024, AS Unit 2, Q16(a) (2 marks): The light intensity incident on the LDR decreases. Explain what happens to the potential difference across the fixed resistor. (2)
- June 2024, AS Unit 2, Q16(b) (3 marks): The security lamp switches on when the potential difference across the fixed resistor is 0.62 V. When the lamp switches on, the ratio of the resistance of the L
- October 2023, AS Unit 2, Q14(a) (6 marks): Deduce whether this circuit would switch on the heater when the temperature falls below 10 °C. You should include a calculation of the p.d. across the thermisto
- January 2023, AS Unit 2, Q6 (1 mark): A light dependent resistor is connected in a circuit, as shown. A V The intensity of light incident on the light dependent resistor decreases. Which row of the
- January 2023, AS Unit 2, Q14(b) (4 marks): The student decreases the temperature of the thermistor. Explain the effect of decreasing the temperature of the thermistor on the ammeter and voltmeter reading
- October 2022, AS Unit 2, Q3 (1 mark): A negative temperature coefficient thermistor and a fixed resistor are connected in a circuit, as shown. A V The temperature of the thermistor increases. Which
- June 2022, AS Unit 2, Q12(a) (4 marks): Determine the milliammeter reading when the temperature of the thermistor is 54 °C. (4) Milliammeter reading = mA
- June 2022, AS Unit 2, Q12(b)(i) (2 marks): Explain how decreasing the temperature of the thermistor affects the voltmeter reading. Do not include calculations in your answer. (2)
- January 2022, AS Unit 2, Q10 (1 mark): A light dependent resistor (LDR) and a fixed resistor are connected in a circuit, as shown. The intensity of the light incident on the LDR is increased. Which o
- October 2021, AS Unit 3, Q1(c)(ii) (3 marks): Calculate the resistance of the thermistor at a temperature of 0 °C. (3) Resistance =
- June 2021, AS Unit 2, Q14(a) (4 marks): The reading on the voltmeter is 3.42 V. Determine the temperature of the thermistor. (4) Temperature =
- June 2021, AS Unit 2, Q14(b) (4 marks): The student suggests that if the e.m.f. of the battery is doubled, the reading on the voltmeter will double. Assess whether the student’s suggestion is correct.
- January 2021, AS Unit 2, Q13(a) (2 marks): Calculate the resistance of the LDR when the lights were off. (2) Resistance of LDR =
- January 2021, AS Unit 2, Q13(b) (2 marks): When the lights were switched back on, the student discovered that it was impossible to calculate the resistance of the LDR using this circuit. The teacher said
- October 2020, AS Unit 2, Q10 (1 mark): The circuit shows a potential divider, including a battery of negligible internal resistance and a light dependent resistor (LDR). The potential difference (p.d
- October 2020, Unit 5, Q4 (1 mark): A negative temperature coefficient thermistor and a resistor are connected as shown. A V The temperature of the thermistor decreases. Select the row of the tabl
- January 2020, AS Unit 2, Q7 (1 mark): A negative temperature coefficient thermistor is connected in a circuit as shown. A V1 V2 The temperature of the thermistor is increased. Which row of the table
- June 2019, AS Unit 2, Q15(c)(i) (3 marks): In normal daylight, this particular type of LDR has a resistance of 670 ȍ. Calculate the power dissipated in the fixed resistor in normal daylight. resistance o
- June 2019, AS Unit 2, Q15(c)(ii) (4 marks): As the light intensity incident upon the LDR decreases, the power dissipated in the fixed resistor decreases. Explain why the power in the fixed resistor decrea
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