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Electric Fire alarm works on the principal of:
الیکٹرک فائر الارم کس پرنسپل پر کام کرتا ہے
  1. Conduction
  2. Heat transfer
  3. contraction
  4. expansion
Explanation

Expansion of metals or gas, caused by a rise in temperature, exerts pressure that can be used to close the contacts of an electrical circuit. 


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