What happens to resistance when the light intensity on the cad cell increases?

When light intensity on the cad cell increases, the resistance decreases. This behavior is due to the nature of the cad cell, which is a photoconductive device. As the amount of light that the cad cell is exposed to rises, the energy absorbed by the material increases, allowing more electrons to flow. This increased flow of electrons corresponds to a reduction in resistance, enabling the cad cell to conduct electricity more effectively.

In practical terms, this means that as the ambient light increases, the cad cell can trigger circuits or mechanisms more readily, often used in systems to control heating or lighting based on light conditions. This principle is utilized in various applications, including automated lighting systems, where the cad cell acts as a light sensor, responding to changes in environmental light levels.