Why is this device used in an electric circuit? On which effect of current do they work?
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Answer 1 ::
In the given figure, it is a safety device named fuse. It is used in circuit because it prevents damage or short circuiting of appliances connected in that connection. It has a wire which has very low melting and boiling point. Whenever current increases over the limit of fuse, the wire of fuse melts. And as a result breaking the circuit, which will further prevent overload of current on appliances. Hence it must be used in every circuit with.
Answer 2::
It works on the heating effect of electric current.
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