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प्रश्न
Describe with the aid of a diagram some form of a fuse which is used in the electric lighting circuit of a house. Give two reasons why a fuse must not be replaced by an ordinary copper wire.
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उत्तर
The figure above shows the most common fuse arrangement in which the fuse wire is stretched between the two metallic terminals T1 and T2 in a porcelain holder. This holder fits into a porcelain socket having two metallic terminals, to each of which the live wire of the circuit is connected. A fuse must not be replaced with a copper wire because copper has very low resistivity and a high melting point.
Ordinary wire has low resistance and high M.P. and when High current passes into the appliance and gets damaged even then fuse will not melt and will not disconnect the appliance.
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संबंधित प्रश्न
Explain the meaning of the student 'current rating of a fuse is 5A'.
For a fuse, higher the current rating ________ is the fuse wire.
A fuse is rated 8A. Can it be used with an electrical appliance rated 5 KW, 200 V ? Give a reason.
A fuse wire is made of an alloy of ______ and ______. If the current in a circuit exceeds the current rating of the fuse wire, it ______.
Explain the meaning of the statement ‘the current rating of a fuse is 5 A’.
How does the thickness of a fuse wire depend on its current rating?
What is an ‘electric fuse’? State its two characteristics of electric fuse.
(a) Name the electrical appliance shown in the diagram below.
(b) Name the material of the wire used in this device.
(c) Name two important characteristics of this wire.
Name the material of fuse. State one characteristic of the material used for fuse.
How does the length of a fuse wire depend on its current rating?
