What is the principal of fire alarm and how does it work?

Question

i have to make a model on fire alarm so please let me know that what is the principal of it and please explain fully. Urgent!

Answer 1

It uses a stream of the element americinium to complete a circuit. When the stream is interupted by smoke, the alarm sounds.

Answer 2

There are a lot of fire alarm systems depending what kind of an alarm system you want.Fire alarm system with (smoke detectors,heat detectors,flame detectors  almost the same with heat detectors,ionized smoke detectors and duct detectors) depending on the system of your needs.For you to understand it I will explain 2 of it.Smoke detectors have smoke sensors in side if the smoke is too much the alarm system starts to work,that means alarm works.How the alarm works the smoke detection system analysis the air which goes through it , if the sensor senses any increase of CO or CO2 then it starts the alarm. Flame or heat detector has a contact which is made of 2 different materials which has different specific heat, Ä°f any heat reaches to this contact according t the different specific heated material contact bends towards the more specific heated material( you can do it with copper and iron at home if you fix them with a nonmetallic material and heat them even with a lighter you will see it with your eyes) than the alarm starts because the contact touches a metallic material to give the energy to the horn or bell.( for more specific information try Notifier or Honeywell

Answer 3

Your question is too broad to answer.  You need to tell us more.  Are you interested in fire detectors, fire alarm systems or what?

Also if you would allow e-mail, folks could help you more.  By the way, TA hides your actual e-mail address from others.