smoke alarm - definição. O que é smoke alarm. Significado, conceito
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O que (quem) é smoke alarm - definição

DEVICE THAT DETECTS SMOKE, TYPICALLY AS AN INDICATOR OF FIRE
Smoke alarm; Smoke detectors; Cigarette Smoke Detector; Smoke alarms; Smoke Detector; Cigarette detector; Smoke detection; Americium smoke detector; Single station smoke detector; Interconnected smoke detector; Standalone smoke detector; Ionization smoke detector; Photoelectric smoke detector; Optical smoke detector
  • An americium container from a smoke detector
  • An integrated locking mechanism for commercial building doors. Inside an enclosure are a locking device, smoke detector and power supply.
  • Optical smoke detector with the cover removed; the angled plastic in an arc across the top is a light baffle
  • Optical smoke detector<br />1: Optical chamber<br />2: Cover<br />3: Case moulding <br />4: Photodiode (transducer)<br />5: Infrared LED
  • A video overview of how an ionization smoke detector works
  • A 2007 U.S. guide to placing smoke detectors, suggesting that one be placed on every floor of a building, and in each bedroom
  • Smoke detector mounted on a ceiling
  • An addressable Simplex TrueAlarm smoke detector

smoke alarm         
also smoke detector (smoke alarms)
A smoke alarm or a smoke detector is a device fixed to the ceiling of a room which makes a loud noise if there is smoke in the air, to warn people.
N-COUNT
smoke alarm         
¦ noun a device that detects and gives a warning of the presence of smoke.
Smoke detector         
A smoke detector is a device that senses smoke, typically as an indicator of fire. Smoke detectors are usually housed in plastic enclosures, typically shaped like a disk about in diameter and thick, but shape and size vary.

Wikipédia

Smoke detector

A smoke detector is a device that senses smoke, typically as an indicator of fire. Smoke detectors are usually housed in plastic enclosures, typically shaped like a disk about 150 millimetres (6 in) in diameter and 25 millimetres (1 in) thick, but shape and size vary. Smoke can be detected either optically (photoelectric) or by physical process (ionization). Detectors may use one or both sensing methods. Sensitive alarms can be used to detect and deter smoking in banned areas. Smoke detectors in large commercial and industrial buildings are usually connected to a central fire alarm system.

Household smoke detectors, also known as smoke alarms, generally issue an audible or visual alarm from the detector itself or several detectors if there are multiple devices interlinked. Household smoke detectors range from individual battery-powered units to several interlinked units with battery backup. With interlinked units, if any unit detects smoke, alarms will trigger at all of the units. This happens even if household power has gone out.

Commercial smoke detectors issue a signal to a fire alarm control panel as part of a fire alarm system. Usually, an individual commercial smoke detector unit does not issue an alarm; some, however, do have built-in sounders.

The risk of dying in a residential fire is cut in half in houses with working smoke detectors. The US National Fire Protection Association reports 0.53 deaths per 100 fires in homes with working smoke detectors compared to 1.18 deaths without (2009–2013). However, some homes do not have any smoke alarms and some homes do not have any working batteries in their smoke alarms.

Exemplos do corpo de texto para smoke alarm
1. The prosecution claimed he started the fire and dismantled a smoke alarm.
2. Hours later, Mr McHale senior was woken by the sound of a smoke alarm.
3. I‘m so glad we had a smoke alarm and this quick–thinking youngster.
4. It‘s just that the smoke alarm hasn‘t gone off yet," according to The Sun.
5. The smoke alarm had activated, but it was the bird‘s call that caught Conwell‘s attention.