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Showing Results For: LDR (Light Dependent Resistors)
Light-dependent resistors (LDRs), also known as photoresistors, are a pivotal component in electronic circuits sensitive to light. These resistors are unique because their resistance changes in response to the intensity of light they are exposed to. Primarily, LDRs consist of a high-resistance semiconductor material that absorbs photons. When exposed to light, the energy of the absorbed photons is transferred to the semiconductor, causing more charge carriers to be released and thereby decreasing the resistance.
The typical LDR is made up of a photoconductive material, such as cadmium sulfide or cadmium selenide, coated onto an insulating substrate. This coating is then patterned to expose a large surface area to light. Electrodes are attached to the layer to allow for the measurement of resistance. Under low light conditions, the LDR exhibits high resistance, but as light intensity increases, the resistance drops significantly, allowing more current to pass through.
By leveraging the unique properties of LDRs, various industries have been able to develop more efficient, cost-effective, and responsive products and solutions. It is typically found in multiple scenarios, including: