In which of the following situations will a fuse possibly melt?

The earth wire is broken

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There is a short circuit in the electrical circuit

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The fuse is fixed along the neutral wire instead of the live wire

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The fuse wire is connected to earth wire

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Solution

The correct options are
A There is a short circuit in the electrical circuit
B The earth wire is broken
C The fuse is fixed along the neutral wire instead of the live wire
A fuse wire may possibly melt when:

(i) the earth wire is broken:
the excess current that was supposed to be grounded through earth wire won't get a path to the earth. So this excess current will melt the fuse wire instead.

(ii) the fuse is fixed along the neutral wire instead of the live wire.
The fuse will melt anyway even if it is fixed in the neutral wire. However, it won't serve its purpose with safety in that case.

(iii) there is a short circuit in the electrical circuit:
Short circuit leads to a high current which melts the fuse.

Suggest Corrections

Similar questions

The main fuse is connected in :

(a) live wire

(b) neutral wire

(d) both the earth and neutral wires.

With which wire, live or neutral, the fuse wire is connected?

Complete the following sentences :

(a) A fuse is a short piece of wire of high ___ and of the material of low ___.

(b) 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 ___.

(d) Higher the current rating, ___ is the fuse wire.

Write true or false for each statement:

(a) A fuse wire has a high melting point.

(b) Flow of protons constitutes electric current.

(d) S.I. unit and commercial unit of electrical energy are same.

(e) Overloading of electric current in circuits can lead to short circuiting.

(f) Our body can pass electricity through it.

(g) The metallic cases of all appliances are insulators of electricity.

(h) The earth wire protects us from an electric shock.

(i) A switch should not be touched with wet hands.

(j) All electrical appliances in a household circuit work at the same voltage.

(k) In a cable,the green wire is the live wire.

(l) A fuse is connected to the live wire.

(m) A switch is connected to the neutral wire.

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