What device is typically activated by relay systems in alarms?

Audible alarms are typically activated by relay systems in alarms because these systems control the signaling and alerting mechanisms within a security or alarm system. When a trigger is detected, such as a breach in security or a detected hazard, the relay system sends a signal to activate the audible alarm, which alerts individuals to the situation.

Audible alarms are crucial for notifying occupants or responding personnel of an emergency, which aligns with the primary function of relay systems that is to manage and respond to signals generated from various detection devices.

While ventilation fans, emergency lights, and carbon monoxide detectors can also be part of an alarm system, they do not commonly serve as the primary alerting device in response to alarms. In particular, ventilation fans might be activated as part of a response to a detected smoke condition or to help clear an area. Emergency lights can assist in illuminating an area during a power outage or emergency, while carbon monoxide detectors function independently to alert individuals of a specific hazard. However, it is the audible alarms that are the standard response mechanism triggered by relay systems in most alarm configurations.