What is the response of a cad cell to changes in light intensity?

The cad cell, or photoresistor, functions based on the principle that its resistance changes in response to light intensity. When the light is bright, the cad cell’s resistance decreases, allowing more current to pass through, which can trigger the system to operate. Conversely, in low light conditions, the resistance increases, reducing current flow and potentially shutting the system down.

Therefore, saying that less resistance is associated with more light and more resistance corresponds to less light represents the fundamental working principle of how a cad cell operates in HVAC systems. This connection between light intensity and resistance is crucial in controlling the operation of oil burners, as the cad cell can help prevent the burner from running when there is not enough flame detected.

A cad cell's ability to respond accurately to these changes in light intensity is vital for the safe and efficient operation of HVAC systems that rely on oil burners.