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Photoresistor

img_photoresistor

A photoresistor, also known as a photocell, is a light-sensitive variable resistor. Its resistance decreases as the intensity of incident light increases, a phenomenon known as photoconductivity.

Photoresistors are commonly used in light-sensitive detection circuits and light- or dark-activated switching circuits, functioning as semiconductor resistors. In darkness, a photoresistor’s resistance can reach several megaohms (MΩ), whereas under bright light, its resistance can drop to just a few hundred ohms.

Below is the electronic symbol for a photoresistor.

img_photoresistor_symbol

Example