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klemol [59]
3 years ago
5

How does a bimetallic strip work in a sinple alarm system​

Physics
2 answers:
kirill115 [55]3 years ago
8 0

Answer:

The bimetallic strip in a fire alarm is made of two metals with different expansion rates bonded together to form one piece of metal. ... When the strip touches that contact, it completes a circuit that triggers the alarm to sound.

tatiyna3 years ago
7 0
The bimetallic strip in a fire alarm is made of two metals with different expansion rates bonded together to form one piece of metal. Typically, the low-expansion side is made of a nickel-iron alloy called Invar, while the high-expansion side is an alloy of copper or nickel. The strip is electrically energized with a low-voltage current. When the strip is heated by fire, the high-expansion side bends the strip toward an electrical contact. When the strip touches that contact, it completes a circuit that triggers the alarm to sound. The width of the gap between the contacts determines the temperature that will set off the alarm.
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