Question 10
FThe Figure shows how the resistance of a light-dependent resistor (LDR) changes with light intensity.
Figure
a.[2]
Describe how the resistance of the LDR changes as the light intensity increases.
b.[1]
Use the Figure to determine the resistance of the LDR when the light intensity is 4 arbitrary units.
c.[3]
The LDR is connected in series with an ammeter and a 6.0 V battery.
Calculate the current in the LDR when the light intensity is 4 arbitrary units.
Give your answer in mA\text{mA}mA.
d.[2]
The light intensity on the LDR decreases.
Explain what happens to the current in the LDR.
e.[1]
Give one use of an LDR.
10.2 Resistance Questions
81 exam-style questions on Edexcel GCSE Physics 10.2 Resistance, covering 10.2.1 Current in a circuit and conservation at junctions, 10.2.2 Resistance and variable resistors, 10.2.3 Series and parallel resistance, 10.2.4 I–V characteristics of components, and 10.2.5 LDRs and thermistors. Each one has a worked solution and a mark scheme showing where the marks go.