How do Fire Alarms Work?

There are two basic types of fire alarms or smoke detectors. One is equipped with a light beam, and if smoke is in the room, it will break the light connection, causing the alarm to go off. The other is based on connectors, and if smoke breaks the connection, it will set the alarm off.

You can find more information here: wisegeek.com/how-do-smoke-alarms-work.htm.

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