Question

what is a bimetallic strip?Explain how it is used in a fire alarm ?​

Answer 1

Bimetallic strip:

It is a kind of temperature sensor. It responses to heat by closing normally open circuit to activate the alarm.

Use in Fire Alarm:

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.

Answer 2

The main objective of  bimetallic strip is to translated the   temperature change into the mechanical displacement and Following are the points that describe how bimetallic strip is used in the fire alarm.

Explanation:

• The bimetallic strip  is formed of multiple metals fused together to create single chunk of steel with various expansion speeds. The low-expansion formed by the nickel-iron of alloy that is known as  Invar whereas the large-expansion part is a copper alloy.
• The wire is powered electrically by low-voltage circuit. The high-expansion part flexes the wire forward with an electrode material .
• Whenever the stripe is heated by fire. When the contact is made by the strip it finishes a loop the activates the sound of the alarm. That length of the touch distance defines a temperature that will switch the alarm off.

Learn More :

• brainly.in/question/2674308