Edexcel IGCSE Physics 2.11 LDRs & thermistors
Practise interpreting LDR and thermistor circuits using resistance graphs, voltage sharing and changes in light intensity or temperature.
- Syllabus
- First assessment 2019
- Course
- Physics 4PH1
Exam points
- use a graph to read LDR or thermistor resistance at a given light intensity or temperature
- explain voltage changes in a potential divider when LDR resistance falls in brighter light
- describe calibration measurements using water, a thermometer and voltmeter for a thermistor
2.11 LDRs and thermistors question 1
The circuit diagram shows a light dependent resistor (LDR) and a resistor connected in series with a 1.5 V cell.
The graph shows how the resistance of the LDR changes with light intensity.
Describe the relationship between the resistance of the LDR and light intensity.
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