Ionization smoke alarms are general y more
responsive to flaming fires.
How they work:
Ionization-type smoke alarms have a smal amount
of radioactive material between two electrical y
Stop-Drop and Roll
charged plates, which ionizes the air and causes
By BASF Jr. Reporter Georgina Beirne, Rutherford, NJ
current to flow between the plates. When smoke
enters the chamber, it disrupts the flow of ions,
thus reducing the flow of current and activating
Photoelectric smoke alarms are general y more
responsive to fires that begin with a long period of
smoldering (cal ed "smoldering fires").
How they work:
IF A FIRE GOES ON, JUST STOP, DROP AND ROLL.
Photoelectric-type alarms aim a light source into a
sensing chamber at an angle away from the sensor.
The Science of smoke detectors
Smoke enters the chamber, reflecting light onto the
light sensor; triggering the alarm
You may not know it, but science helps us in our
daily lives every day. Sure, with medicine and
new research, but smoke detectors? Actual y, there
is science behind how a smoke detector works.
In the fol owing paragraphs, I wil explain how
science is combined in the smoke detector.
As you already know, smoke detectors are used
to alert you and your family when there is a high
smoke build-up in your house. But there are two
main types of smoke detectors. There are ionization
detectors and the photoelectric detectors.
Let's break this down, so it is easier to understand.
Take a look at how a smoke
detector works! Science is amazing!