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How does use of a fuse-wire protect elec...

How does use of a fuse-wire protect electrical appliances ?

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A fuse is a circuit connection that will be destroyed by excessive current flow, creating an open circuit, to protect electrical appliances from receiving to high current. It is designed to be the weakest link in the circuit, which will fail before the other components are damaged.
The simplest fuses contain thin wire strips that melts when heated by excessive current flow. A fuse wire consists of low melting point and high resistivity and it is always connected in live wire.
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NCERT EXEMPLAR-ELECTRICITY-Electricity
  1. An electric kettle consumes 1 kW of electric power when operated at 22...

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  2. Two resistors of resistances 2 Omega and 4 Omega when connected to a b...

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  3. Unit of electric power may also be expressed as :

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  4. A child has drawn the electric circuit to study Ohm's law as shown in ...

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  5. Three 2 Omega resistors, A, B and C are connected as shown in figure. ...

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  6. Should the resistance of an ammeter be low or high ? Give reason.

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  7. Draw a circuit diagram of an electric circuit containing a cell, a key...

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  8. How does use of a fuse-wire protect electrical appliances ?

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  9. What is electrical resistivity ? In a series electrical circuit compri...

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  10. What is the commercial unit of electrical energy ? Represent it in ter...

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  11. (a) A current of 1 A flows in a series curcuit containing an electric ...

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  12. Why is parallel arrangement used in domestic wiring ?

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  13. B1,B2 and B3 are three identical bulbs connected as shown in (fig. 3.4...

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  14. Three incandecent bulbs of 100 W each are connected in series in an el...

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  15. State Ohm's law ? How can it be verified experimentally ? Does it hold...

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  16. What is electrical resistivity ? How does it depend om temperature. Gi...

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  17. How will you infer with the help of an experiment that the same curren...

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  18. How will you conclude that the same potential difference (voltage) exi...

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  19. What is Joule's heating effect ? How can it be demonstrated experiment...

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  20. Find out the folowing in the electric circuit given in (Fig. 3.48). ...

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