Photo cells are little light sensors. As the squiggly face is exposed to more light, the resistance goes down. When its light, the resistance is about 5-10KΩ, when dark it goes up to 200KΩ. Great for light dependent projects such as a light seeking robot, a lamp that automatically turns on in the dark, or even a security alarm that activates when you break the steam of light between the LDR and a light source.
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