Edexcel A-Level Physics Potential Divider Circuits

Practise Edexcel A-Level Physics potential divider circuits with resistor ratios, LDR behaviour, voltmeter readings and resolution limits.

Exam points

calculate potential-divider voltmeter readings from resistance ratios and supply p.d.
explain LDR potential-divider changes when light intensity changes resistance
judge when voltmeter resolution prevents reliable LDR resistance calculation

[Maximum number: 3]

A student investigated the behaviour of a thermistor using the circuit shown in the diagram.

She heated the thermistor to 100 °C and measured the potential difference V across it. She decreased the temperature θ and recorded further measurements of V and θ until the temperature reached 10 °C.

Figure for Question 2.4.75 - Potential divider circuits question 1 — Edexcel A-Level Physics AS

The student plotted a graph of her measurements of V and θ.

Calculate the resistance of the thermistor at a temperature of 0 °C.

Resistance =

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2.4.75 - Potential divider circuits question 1