Variable Resistors

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PHOTORESISTORS
A photoresistor, or photoconductive cell, is basically a light sensitive resistor whose resistance changes as light is exposed to it. Basically photoresistors change resistance as light intensity changes. The photoresistor has high resistance with no light exposed and decreases in resistance as light intensity increases. A common automotive use for photoresistors is the automatic headlamp circuit.

Photo Resistor Electrical Symbol