Dice Photoresistors LDR Light Dependent Resistors Sensors 5 Pcs

The Light Dependent Resistor (LDR), also known as a photoresistor, is a passive electronic component that changes its resistance based on the amount of light falling upon it. It is a semiconductor device that exhibits photoconductivity. In the dark, its resistance is very high, often in the megaohms range. When light shines on the LDR, the resistance decreases significantly, down to a few hundred ohms or even less, depending on the light intensity. This property makes it useful in light-sensitive circuits.

Applications:

Automatic Lighting Systems:** Controls streetlights, garden lights, and other lighting systems that turn on at dusk and off at dawn.
Light Meters:** Measures the intensity of light.
Alarm Systems:** Detects changes in light levels to trigger an alarm.
Camera Light Meters:** Helps in determining the correct exposure for photographs.
Toy and Gadget Applications:** Used in light-activated toys and gadgets.

Technical Specifications (Typical):

Dark Resistance:** Several Megaohms (MΩ)
Light Resistance:** Several Hundred Ohms (Ω)
Operating Voltage:** Varies depending on the specific LDR
Power Dissipation:** Varies depending on the specific LDR
Spectral Response:** Sensitive to a range of light wavelengths

The Light Dependent Resistor is a cost-effective and reliable component for light sensing applications, making it a popular choice in both hobbyist projects and industrial applications.