How is bimetallic strip used in fire alarm
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An automatic fire alarm in a building's security system is a heat detector that responds to the heat from a fire by setting off an alarm. Some heat detecting fire alarms rely on a bimetallic strip as the temperature sensor. This strip responds to heat by closing a normally open electrical circuit to activate the alarm.
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it consist of two metal strip with different coefficient of exapansion which on heating metal with greater coefficient whi is on outerside bend form convex side. and inner strip form concave side. due expansion on heating. that's why it is used in fire alarm. in fire alarm it expand to complete circuit and start alarming
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