Hyderabad
08048036175
+919848399491
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LDR Characteristics Apparatus

Phone Number

08048036175

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Email Address mnc.naveen@gmail.com

Mon-Thu: 10 AM - 2 PM • Fri: 3 PM - 7AM

Address Correspondence Address: Shop No. 20, 2nd Floor, Srirama Tower, Bogulkunta, Telangana

Hyderabad, India, 500001

Description

The LDR Characteristics Apparatus is designed to study the variation of resistance in a Light Dependent Resistor (LDR) as the intensity of incident light changes. Description and Components This apparatus typically includes: A regulated DC power supply, usually ranging from 0 to 3V or 0 to 30V, for biasing the LDR circuit. An analog voltmeter and milliammeter to measure the voltage across and current through the LDR. A lamp holder with a stable light source (bulb or LED), which allows control over the light intensity incident on the LDR. The LDR is mounted in a box, often with a transparent or translucent window for light entry. A meter scale or adjustable plank may be included to vary and measure the distance between the light source and LDR to control intensity. Working Principle The resistance of an LDR decreases as the intensity of incident light increases due to photoconductivity. The photoconductive material, typically cadmium sulfide (CdS), produces more charge carriers when illuminated, lowering resistance. Procedure The circuit is arranged so the LDR receives variable light intensity from the lamp source. Voltage and current across the LDR are measured for different light levels. Distance between LDR and light source is varied to change intensity, and corresponding resistance is calculated using Ohm's Law. The relationship between light intensity and LDR resistance can be plotted, showing a rapid decrease in resistance as light intensity increases. Applications This setup is commonly used for physics and electronics experiments to understand sensor behavior, and in teaching and research for characterizing optoelectronic components.The LDR Characteristics Apparatus is used in laboratories to study how the resistance of a Light Dependent Resistor (LDR) varies with incident light intensity. Apparatus Features Includes a regulated DC power supply (commonly 0-3V or 0-30V) to bias the circuit. Equipped with voltmeter and milliammeter for measuring voltage and current across the LDR. Contains a stable light source (bulb or LED) with a lamp holder to adjust light intensity falling on the LDR. The LDR is typically mounted on a panel or box, sometimes complemented by a meter scale to vary and measure the distance from the light source. Working Principle The LDR is a sensor whose resistance decreases as the intensity of incident light increases. Its main material, such as cadmium sulfide (CdS), increases conductivity when illuminated due to photoconductivity, allowing more charge carriers to flow. The apparatus helps plot a curve showing resistance versus light intensity at different voltages, visualizing this relationship. Experimental Use Used to demonstrate and study the V-I (voltage-current) or resistance characteristics of LDRs under varied lighting conditions. Common in educational labs and product testing to understand sensitivity and real-world response of optoelectronic sensors.

Model No. N-EL030

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