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GCSE Design and Technology · key term
A resistor whose resistance decreases as the light falling on it increases.
Used by Edexcel and Eduqas
Specification 1.6.1, 1.7.3, 5.2.1 · Paper 1
A light-sensitive resistor whose resistance decreases as the light falling on it becomes brighter and increases as it becomes darker.
Revise: SensorsTwo useful sensors are the light-dependent resistor (LDR) and the thermistor. Both work by changing their resistance.
State the direction of the resistance change: brighter light lowers an LDR’s resistance; rising temperature lowers an NTC thermistor’s resistance.
Distinguish the sensor from the output: an LDR detects light; the lamp produces light.
For an LDR or an NTC thermistor, describe resistance decreasing—not the sensor itself switching an output on.
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A resistor whose resistance decreases as the light falling on it becomes more intense.
Component 1
A resistor whose resistance decreases as the intensity of light falling on it increases.
Revise: Electronic Control SystemsA light dependent resistor (LDR) senses light: its resistance is high in darkness and falls as the light becomes brighter. This change is not proportional to the change in light intensity.
