+18 Photocell Light 2023. The energy of photons hitting the semiconductor frees. At dusk when the light level reduces, it switches the light on, and at dawn when the light level increases again it switches the light off.
Photocell sensors work like a timer switch in that they power light fixtures off and on automatically during a set “time”. A photocell is a resistor that changes resistance depending on the amount of light incident on it. Web as the light level increases, the analog voltage goes up even though the resistance goes down:
