All the current will instead pass through the LDR and the potentiometer. Therefore, no current will go from the collector to the emitter of the transistor. This makes the voltage at the base of the transistor too low to turn the transistor ON. When it’s dark, the LDR has high resistance. This makes them jump into the conductive band and thereby conduct electricity.Ĭheck out Wikipedia for the physics stuff ) How The LDR Circuit Diagram Works When light hits the device, the photons give electrons energy. They are made of high resistance semiconductor material. Light Dependent Resistors (LDR) are also called photoresistors.
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