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Unit - 6.1 Heat Transfer — PHYSICS STD 8 — Question

ICSE BoardEnglish MediumSTD 8PHYSICSUnit - 6.1 Heat Transfer1 Mark
Question
How is bimetallic strip used in fire alarm?
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Answer

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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