4. Why bimetallic strip is used in the fire alarm
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A bimetallic strip is made of two separate strips of metal stuck together. These two strips expand to a different extent when heated. So, when the strip is heated, one strip will be longer than the other. Therefore, the bimetallic strip will bend.
In fire alarms this is the opposite: the circuit is completed so that the fire bell can ring and everyone can escape.
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