User manual

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Chapter10 Photoresistor

What’s photoresistor?

Photoresistor, also known as light pipes, common production materials is cadmium sulfide, There

are also selenium, aluminum sulfide, lead sulfide and bismuth sulfide material. these production

materials having characteristics in light of a specific wavelength, its resistance decreases rapidly.

This is due to the light generated carriers are involved in the electrical conductivity, under the

applied electric field drift motion, so that the photosensitive resistor rapid decline.

Experiment component

 Photoresistor : 1

 Buzzer : 1

 10K resistor : 1

 220Ω resistor : 1

 Breadboard & Jumper wires

Connect your circuit as the below diagram.