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Question
What is the role of fuse, used in series with any electrical appliance? Why should a fuse with defined rating not be replaced by one with a larger rating?
Solution
Fuse is the most important safety device, used for protecting the circuits due to short-circuiting or overloading of the circuits.
The use of an electric fuse prevents the electric circuit and the appliance from possible damage by stopping the flow of unduly high electric current. The Joule heating that takes place in the fuse melts it to break the electric circuit. So, a fuse is always connected in series with an appliance. If it is connected in parallel then it will not be able to break the circuit and current keeps on flowing.
When a fuse with a defined rating for a particular appliance is replaced by one with a larger rating, then it will not melt as the current exceeds in the wire and short-circuiting or overloading may occur.
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