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 ► https://en.wikipedia.org/wiki/Photore...
Photodiode ► https://en.wikipedia.org/wiki/Photodiode
Photoelectric effect ► https://en.wikipedia.org/wiki/Photoel...
Solar Cell ► https://en.wikipedia.org/wiki/Solar_cell

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