How Smoke Detectors Work
Once again we turn to Bill, the “Engineer Guy,” to explain how the world works. This time? Smoke detectors.
It turns out, a miniscule piece of radioactive material, Americium, works in conjunction with a special integrated circuit, called a MOSFET (or Metal Oxide Semiconductor Field Effect Transistor). It can detect a change in current as small as 100 pico Amps. This change is what ends up setting off the alarm.
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