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Fuses

Which of the ...

Question

Which of the following option has no effect on an electric fuse wire?

A

Its specific resistance

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B

Its radius

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C

Its colour

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D

Current flowing through it

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Solution

The correct option is A Its colour
A fuse is a safety device that provides overcurrent protection, to an electrical circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, interrupting the current that it connects.
Therefore the working of the fuse depends upon its resistance and current flowing through it.

Hence, the correct option is C.

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Similar questions

Q. (a) How should the electric lamps in a building be connected so that switching on or off in a room has no effect on other lamps in the building? State one or more advantage of such an arrangement.
(b) Which effect of current is utilised in the working of an electric fuse? How does an electric fuse work?
(c) What is the usual colour of the insulation of (i) earth wire, and (ii) live wire?
(d) When does an electric short circuit occur? What harm can do it?
(e) Explain the purpose of earthing an electrical appliance.

Q. On which effect of current does an electric fuse work?

Q. Consider the following statements regarding electric fuse wire
1.It has low melting point
2.It has very high specific resistance
3.it is connected in parallel with the electric circuit
Which of the statements given above is/are correct?

Q. Write True (T) or False (F) against the following statements in the given brackets:
1. Current flows through a circuit when it is open. ( )
2. Electric bell is based on the heating effect of current. ( )
3. An electric bell has an electromagnet. ( )
4. To make a battery of two cells, the negative terminal of one cell is connected to the negative terminal of the other cell. ( )
5. When the electric current through the fuse exceeds a certain limit, the fuse wire melts and breaks. ( )
6. The magnetic strength in a conductor decreases with the increase in current. ( )

Question 2

Choose the statement which is not correct in the case of an electric fuse.

(a) Fuses are inserted in electric circuits of all buildings

(b) There is a maximum limit on the current which can safely flow through the electric circuits

(c) There is a minimum limit on the current which can safely flow in the electric circuits

(d) If a proper fuse is inserted in a circuit it will blow off if current exceeds the safe limit

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