Quick Answer: The Fire Alarm Model shows how a thermal fire alarm works using a bimetallic strip. When the strip is heated it bends, closes the circuit and sounds a buzzer powered by a nine-volt battery.
Last updated: October 2026
Key Features
Heat-sensitive bimetallic strip that bends when warmed
Buzzer alarm that sounds once the circuit is completed
Powered by a nine-volt battery
Components mounted on a plastic base
Heat source included to simulate a fire
Technical Specifications
Specification
Value
Sensing element
Bimetallic strip
Alarm
Buzzer
Power
Nine-volt battery
Base
Plastic
About This Product
The model links thermal expansion with a simple electric circuit. As the two metals in the strip expand by different amounts, the strip curls until it touches the contact, and the buzzer sounds. It helps students see how heat detectors in buildings respond to a rise in temperature. Schools, colleges and institutes in Dominican Republic, Brazil, South Korea, Equatorial Guinea and Indonesia can order the Fire Alarm Model from Educational Instrument.
Frequently Asked Questions
What makes the alarm go off?
Heating makes the bimetallic strip bend until it completes the electrical circuit, which switches on the buzzer.
