Which of the following components is essential in an alarm system for detecting unauthorized entry?

In an alarm system designed specifically for detecting unauthorized entry, motion detectors play a crucial role. These devices are designed to sense movement within a secured area, effectively alerting the system when an intruder attempts to gain access to a location. Motion detectors can use various technologies, such as passive infrared, microwave, or dual-tech sensors, to identify disturbances in their monitored environments.

While other components, such as cameras, smoke detectors, and alarm panels, contribute to the overall security and safety of a premises, they serve different purposes. Cameras are primarily used for surveillance and can help identify intruders after an event has occurred. Smoke detectors are designed to detect fire and smoke, not unauthorized entry. The alarm panel serves as the control center for the entire system, processing signals from various security devices, but it does not directly detect movement itself.

Therefore, in the context of detecting unauthorized entry, motion detectors are essential as they provide the necessary functionality to monitor and respond to potential intrusions effectively.