CAIE A-Level Physics AS 9.3.7 The Resistance of a Light Dependent Resistor Ldr Decreases Questions
Explain that the resistance of an LDR decreases as light intensity increases.
- Syllabus
- 2028–2030
- Course
- Physics 9702
- Level
- AS
Exam points
- Explain that the resistance of an LDR decreases as light intensity increases.
CAIE A-Level Physics AS 9.3.7 The Resistance of a Light Dependent Resistor Ldr Decreases Questions question 1
The circuit in (a) is now modified by adding a uniform resistance wire XY and a galvanometer, as shown in Fig. 7.2.
Fig. 7.2 (not to scale)
The length of the wire XY is 1.2 m . The movable connection Z is positioned on the wire XY so that the galvanometer reading is zero.
The environmental conditions change causing a decrease in the resistance of the LDR. The temperature of the LDR remains constant.
State whether there is a decrease, increase or no change to:
- the intensity of the light illuminating the LDR
- the total power produced by the battery
- the length XZ so that the galvanometer reads zero.
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