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A photoresistor, Light Dependent Resistor (LDR) or Photocell is a photodetector or photosensor, this is an electronic device sensitive to light. When it receives light, its electric resistance goes down.
I will show how LDRs work and several simple and easy experiments with a LDR.
Photoresistor ► en.wikipedia.org/wiki/Photore...
Photodiode ► en.wikipedia.org/wiki/Photodiode
Photoelectric effect ► en.wikipedia.org/wiki/Photoel...
Solar Cell ► en.wikipedia.org/wiki/Solar_cell
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