NCIDQ IDFX Practice Exam

Photoelectric cells are often associated with which type of safety system?

1. Fire extinguishing systems

2. Intrusion detection systems

3. Industrial cooling systems

4. Emergency lighting systems

The correct answer is: Intrusion detection systems

Photoelectric cells are devices that convert light into electrical energy and are commonly used in various applications. In the context of safety systems, they play a crucial role in intrusion detection systems. These systems utilize photoelectric cells to detect movement or changes in the environment, such as when an object interrupts a beam of light. When an intruder crosses a designated threshold, the interruption of the light beam triggers an alarm or alert system, thereby enhancing security. The ability of photoelectric cells to respond quickly to changes in light conditions makes them effective in monitoring and detecting unauthorized access to secured areas. While photoelectric cells can have applications in other areas like emergency lighting systems where they might be used to sense ambient light and activate lights when necessary, their primary association in safety systems is with intrusion detection.