SunFounder 3in1 Kit
1.22 Photoresistor
A photoresistor or photocell is a light-controlled variable resistor. The resistance of a photoresistor decreases with
increasing incident light intensity; in other words, it exhibits photo conductivity.
A photoresistor can be applied in light-sensitive detector circuits and light-activated and dark-activated switching cir-
cuits acting as a resistance semiconductor. In the dark, a photoresistor can have a resistance as high as several megaohms
(M), while in the light, a photoresistor can have a resistance as low as a few hundred ohms.
Here is the electronic symbol of photoresistor.
• Photoresistor - Wikipedia
Example
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42 Chapter 1. Components List and Introduction
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