How does a smoke detector work

Question

Accepted Answer

A smoke detector works by detecting smoke particles in the air and triggering an alarm to alert occupants of a potential fire.

Smoke detectors use either ionization or photoelectric sensors to detect smoke particles.
Ionization smoke detectors use a small amount of radioactive material to ionize the air, creating a small electrical current. When smoke enters the detector, it disrupts the current and triggers the alarm.
Photoelectric smoke detectors use a light source and a light-sensitive sensor. When smoke enters the detector, it scatters the light, causing it to hit the sensor and trigger the alarm.
Some smoke detectors combine both ionization and photoelectric sensors for increased accuracy and faster response to different types of fires.
Smoke detectors are typically powered by batteries or connected to the building's electrical system with a backup battery in case of power failure.
When the smoke detector detects smoke, it emits a loud alarm sound to alert occupants and potentially save lives.

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