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  2. Fire alarm system - Wikipedia

    en.wikipedia.org/wiki/Fire_alarm_system

    Fire alarm warning devices can also be set to different volume levels. Notification appliances utilize audible, visible, tactile, textual or even olfactory stimuli [15] [16] to alert the occupants of the need to evacuate or take action in the event of a fire or other emergency. Evacuation signals may consist of simple appliances that transmit ...

  3. Fire alarm notification appliance - Wikipedia

    en.wikipedia.org/wiki/Fire_alarm_notification...

    A fire alarm notification appliance is an active fire protection component of a fire alarm system. A notification appliance may use audible, visible, or other stimuli to alert the occupants of a fire or other emergency condition requiring action. Audible appliances have been in use longer than any other method of notification.

  4. AP World History: Modern - Wikipedia

    en.wikipedia.org/wiki/AP_World_History:_Modern

    AP World History: Modern was designed to help students develop a greater understanding of the evolution of global processes and contacts as well as interactions between different human societies. The course advances understanding through a combination of selective factual knowledge and appropriate analytical skills.

  5. Smoke detector - Wikipedia

    en.wikipedia.org/wiki/Smoke_detector

    Residential smoke alarms are usually powered with a 9-volt battery, or by mains electricity. Some smoke alarms use a combination of the 2; usually using the 9V battery as an extra power source in the event of an outage. Commercial smoke detectors issue a signal to a fire alarm control panel as part of a fire alarm system. Usually, an individual ...

  6. Automatic Warning System - Wikipedia

    en.wikipedia.org/wiki/Automatic_Warning_System

    An AWS visual indicator (known as the 'sunflower') An AWS audible indicator (capable of producing two different sounds, clear indication sound = bell, warning indication sound = 'horn', or electronic equivalents) An AWS Acknowledge button (used to acknowledge the audible AWS warning indication.

  7. Alarm device - Wikipedia

    en.wikipedia.org/wiki/Alarm_device

    The word alarm comes from the Old French a l'arme meaning "to the arms", or "to the weapons", telling armed men to pick up their weapons and get ready for action because an enemy may have suddenly appeared. [1] The word alarum is an archaic form of alarm. It was sometimes used as a call to arms in the stage directions of Elizabethan dramas. [2]

  8. Optical turnstile - Wikipedia

    en.wikipedia.org/wiki/Optical_turnstile

    Optical turnstiles operate much like regular mechanical turnstiles, except that they rely primarily on electronic beams, and audible/visual interfaces to control entry. Rather than physically restraining a person, the optical turnstile uses sounds and lights to alert others to attempted entry by unauthorized individuals.

  9. Water detector - Wikipedia

    en.wikipedia.org/wiki/Water_detector

    Electronic components used to make a simple water detector: battery, resistor, transistor, water sensor and piezoelectric buzzer for audible alert A water detector is an electronic device that is designed to detect the presence of water for purposes such as to provide an alert in time to allow the prevention of water leakage.