Melde's Apparatus
Melde's Apparatus Original price was: ₹1,500.Current price is: ₹1,150. (Exc. GST)
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Digital Panel Meter
Digital Panel Meter Original price was: ₹300.Current price is: ₹185. (Exc. GST)

LDR Characteristics Apparatus

LDR Characteristics Apparatus includes a DC regulated power supply that has a range of 0-3V/150mA, two round meters for measuring voltage and current, and an LDR mounted on the panel. Connections for supplies and LED are available at 4mm sockets.

Original price was: ₹3,500.Current price is: ₹2,530. (Exc. GST)

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  • Courier delivery

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  • Warranty 1 year
  • Free 7-Day Replacement


An LDR characteristics apparatus is a laboratory device used to investigate the relationship between light intensity and the resistance of an LDR (Light Dependent Resistor). It typically consists of the following components:

  1. DC Regulated Power Supply: This provides a stable voltage source to power the LDR circuit.

  2. LDR: The LDR is the heart of the apparatus and its resistance changes in response to light intensity.

  3. Light Source: A light source, such as a lamp or LED, is used to illuminate the LDR.

  4. Voltmeter and Ammeter: These instruments measure the voltage and current flowing through the LDR circuit.

  5. Connecting Wires and Terminals: These connect the various components of the apparatus.

  6. Mounting Panel: The LDR and light source are typically mounted on a panel for stability and ease of use.

The LDR characteristics apparatus is used to conduct experiments that demonstrate the following characteristics of LDRs:

  1. Resistance vs. Light Intensity: An LDR’s resistance decreases as light intensity increases. This relationship can be plotted as a graph.

  2. Dark Resistance and Saturated Resistance: The dark resistance of an LDR is its resistance when there is no light present, while saturated resistance is its resistance when exposed to a very bright light.

  3. Response Time: The response time of an LDR is the time it takes for its resistance to change from one value to another when the light intensity changes.

  4. Wavelength Sensitivity: The resistance of an LDR varies depending on the wavelength of light it is exposed to.

  5. Temperature Sensitivity: The resistance of an LDR is also affected by temperature.

These characteristics are essential for understanding the behaviour of LDRs and using them effectively in various applications.