82. NCERT Exemplar XXIII

 

Due to low resistancehigh resistanceno resistance, some materials in the wires meltsolidifies quickly and break when a large amount of current is passed through them. Electric fuse wire connected in series in electrical circuits uses a material with a high boiling pointhigh melting pointlow melting point.

 

There is a safety limit for the current to flow in the circuit. The wire gets overheated and melts if the chargeresistancecurrent exceeds this limit due to electromagnetic effectJoule’s heating effectmagnetic effect.

 

In this scenario, the fuse will blow offtrigger alarmwill not blow off when the circuit is broken. This safety device prevents the circuits from any damages occurring due to fire.