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Light Dependent Resistors

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Light Dependent Resistors

Aim of the investigation

• Aim: To study the effect of intensity of light on a LDR ( and derive a relation )

The principle

• A LDR is a light controlled variable resistor. It’s made of a high resistance semi –conductor of Cadmium Sulhpide. Its electrical resistance depends upon the intensity of light on the surface of the LDR.

Apparatus

• 1. Ammeter/Multimeter

• 2. Cell/Battery

• 3. A LDR

• 4. Bulbs of varying power

Procedure

• 1. Keep the LDR in a dark room and measure its dark resistance.

• 2. Adjust the LDR in such a way in front of the source of light falls it receives the light normally.

• 3. Keep the light source of constant power at varying distances and measure the current passing through the resistor

• 4. Keep the distance constant, and use bulbs of varying power. Measure the current for each case

Circuit Diagram

Distance v/s Current

(Distance)^2 v/s Current

Distance v/s Resistance

• Result: From the variation of Resistance with distance, it is observed that the resistance of the LDR increases with an increase in distance

• Real life aplications: can be found in many consumer items such as camera light meters, street lights, clock radios, night lights, outdoor clocks

http://en.wikipedia.org/wiki/Night_light

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