Answer:
(b)
The most important safety, method used for protecting home appliances from
short circuiting or overloading is the electric fuse. This is a safety device
having thin wire of short length made of tin (25%) and lead (75%) alloy having
low melting point around.
The fuse wire is of chosen thickness, so as to fix its resistance and
hence amount of heating on passage of a particular amount of current. Whenever
current through the fuse exceeds the set limit, the fuse wire melts and breaks
the circuit. This saves the main circuit components from damage.
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