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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
What is a fuse?
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 ______.
How is a fuse put in an electric circuit?
‘A fuse is rated 8 A’. can it be used with an electrical appliance of rating 5kW, 200V?
(i) Write one advantage of connecting electrical appliances in parallel combination.
(ii) What characteristics should a fuse wire have ?
(iii) Which wire in a power circuit is connected to the metallic body of the appliance ?
What is an ‘electric fuse’? State its two characteristics of electric fuse.
Identify the option that displays the correct wiring with correct colour code:
State the purpose of using a fuse in a circuit.
How does the length of a fuse wire depend on its current rating?
