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Mand Labs presents

LDR

• Light Dependent Resistor

• No +ve and -ve terminals

• Variable Resistor

• In Light: Resistance decreases

• In Dark: Resistance increases

• Used as light sensor (presence of light)

LDR

Tracks of CdS

Resistance of LDR in light

• Set meter dial to 200k in Ω region

• Connect the probes across the two legs of the LDR

• A LDR does not have any +ve and -ve

• Expose LDR to white light

Resistance of LDR in dark

• Set meter dial to 200k in Ω region

• Connect the probes across the two legs of the LDR

• Expose LDR to dark environment

Schematic Symbol

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