A fuse is designed to protect electrical circuits from excessive current. When the current exceeds a predetermined safe level (due to overload or short circuit), the fuse wire heats up due to its resistance (I²R heating) and melts if it reaches its melting point. This melting breaks the circuit, interrupting the flow of current and protecting the appliance and wiring from damage or fire.
Fuse wire used for safety of household have:
Asked in RPSC RAS Prelims 1998 · Topic: Electric Current (Electrical Power and Energy, Joule heating effect)
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