Q. 21 A4.8( 5 Votes )
When does a fuse cut off current? How does it do it?
A fuse cuts off current when the current exceeds a safe value (due to short circuiting or overloading). When the current becomes large, it heats the fuse wire too much. Since the melting point of fuse wire is low, it melts and breaks the circuit. Thus, current in the circuits is cut off.
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