Edexcel GCSE Physics · 1PH0
Specification 10.19 · Paper 2
Revise: LDR ResistanceTherefore, increasing the light intensity decreases the resistance. Reducing the light intensity has the opposite effect and increases the resistance.
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GCSE Physics · key term
The amount of light reaching a given area; greater light intensity means brighter illumination at the LDR.
Used by Edexcel
Specification 10.19 · Paper 2
Revise: LDR ResistanceTherefore, increasing the light intensity decreases the resistance. Reducing the light intensity has the opposite effect and increases the resistance.
State both directions of the relationship: increasing light intensity decreases an LDR’s resistance; decreasing light intensity increases it.
When interpreting a graph, check the axes before describing the trend. Do not say that resistance rises with light intensity because the line rises when read from right to left.
Do not assume that resistance is inversely proportional to light intensity unless the data establish that relationship; the characteristic is generally non-linear.
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