Resistor

The 4mm LDR Sensor Photoresistor Photo Cell 5-10K GL4516 is an electronic component that detects and measures light levels. It operates using the active voice, meaning it actively senses light rather than being passively affected by it. The sensor is equipped with a 4mm diameter photoresistor, which is a type of resistor that changes its resistance based on the amount of light that falls on it. This resistance range is between 5-10K ohms.