A photoresistor or light-dependent resistor (LDR) or photocell is a light-controlled variable resistor. The resistance of a photoresistor decreases with increasing incident light intensity; in other words, it exhibits photoconductivity. A photoresistor can be applied in light-sensitive detector circuits, and light- and dark-activated switching circuits.
A photoresistor or light-dependent resistor (LDR) or photocell is a light-controlled variable resistor., The resistance of a photoresistor decreases with increasing incident light intensity, In other words, it exhibits photoconductivity.