✔ Light-Dependent Operation
Resistance decreases as light intensity increases.
✔ Based on Photoconductivity
Incident light frees electrons in the semiconductor, enabling conduction.
✔ No Mechanical Parts
Operates silently with long service life and low maintenance.
✔ Energy Efficient
Consumes very little power—ideal for automated systems.
✔ Common Applications
Used in street lighting, solar lamps, light-activated switches, and alarms.
✔ Fast Response to Light Changes
Quickly adjusts resistance based on ambient lighting conditions.
✔ Compact & Easy to Integrate
Small size makes it suitable for a variety of electronics and sensor circuits.
A photocell, also known as a photoresistor or LDR (Light Dependent Resistor), is a light-sensitive device that changes its electrical resistance based on the amount of light falling on it. It works on the principle of photoconductivity—when light strikes its semiconductor material, it releases electrons, allowing current to flow more easily and reducing resistance. The brighter the light, the lower the resistance.
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