2006-08-05 03:45:03 · 3 answers · asked by ssr_selvamraju 2 in Education & Reference ➔ Home Schooling
The following examples would not be a "reliable" alarm system, but would work for the sake of an example. I am assuming this is for strictly educational purposes, and not to be used as an actual alarm.
Okay, disclaimer out of the way...
You basically want 2 elements, a "fire sensing element", and an "noise making element". It's probably easier to construct something to sense heat over smoke. An old thermostat set at the highest point could serve this purpose. The switch can be used to close a circuit that connects a battery to a motorized bell or buzzer. You could also consider something that a flame would quickly "burn away" such as a thread that's kept under tension (i.e. Survior television show). You'd have to get inventive so that when the thread is broke you are tripping some sort of microswitch to engage the buzzer. Maybe a spring that's held taught and when it's "released" it helps to close a switch. If you were simply trying to illustrate something that can respond with a loud noise when exposed to flame... how about an inflated balloon?
Just a few ideas. Good luck!
2006-08-05 11:09:48 · answer #1 · answered by todvango 6 · 0⤊ 0⤋
Model Of Fire Alarm
2016-11-01 01:46:13 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Take the bi-metal from an old thermostat. Use that as the temperature switch for a buzzer, connected to a battery.
Stretch and bend the bi-metal to work as needed, as a switch.
2006-08-05 03:50:19 · answer #3 · answered by Anonymous · 0⤊ 0⤋