This video introduces the light dependent resistor or LDR. These electrical components decrease their resistance when the light intensity increases. It's important to remember that as light intensity increases, resistance decreases.

LDRs are useful as light sensors, acting as switches such as the ones on top of street lamps. As the sun sets and the sky gets darker, the resistance of the LDR increases. And if the circuit is set up correctly, this increase in resistance can cause the street lamp to switch on.

LDRs are represented by a rectangle enclosed in a circle with two arrows incident on the circle.

Thanks for watching,

Lewis

Relevant for GCSE Physics 9-1 in the following exam boards:
AQA (including Trilogy)
Edexcel
OCR A
OCR B
WJEC
CIE (Cambridge International Examinations) IGCSE (Higher only)
Edexcel International IGCSE

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