How Smoke Detector works? Working of Smoke Detectors Explained with 3D Animation

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Transcript

00:00Can you believe that the smoke detectors that every household has are actually radioactive?

00:05The radioactive elements are inside the metal cylinder,

00:08which is also the core component of the smoke detector.

00:11It is called ionization type,

00:13and there are ventilation holes on all four sides so that air and smoke can enter.

00:19Inside it is a short cylinder with a plastic frame,

00:22a metal plate at the top and bottom,

00:24and a small hole in the middle that contains the radioactive substance americium-241,

00:31which will continuously release radioactive particles,

00:34ionizing air molecules to form positively charged ions and negatively charged electrons.

00:40At this time, if a voltage is applied between the two metal sheets,

00:44the positively charged ions and electrons will move to the negative and positive poles respectively

00:50under the action of the electric field, thus forming a weak current.

00:54And then the chip is used to monitor this current.

00:56When there is no smoke, the current remains stable.

00:59And when smoke enters the detector,

01:01the smoke particles will combine with the ions, reducing the number of ions and thus weakening the current,

01:07and the detector will trigger an alarm signal.

01:09But don't worry, the radioactive elements are completely safe in the metal barrel,

01:13but the smoke exposed to the outside will be lost.

01:16So, don't be curious to open it.

01:18Like and follow for more informative videos.

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