What is the reason for the fuse and switch to be located at the live wire?

To cut off the current from the appliance.

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To cut off the high voltage from the appliance.

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To break the circuit when there is a sudden current surge.

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To indicate to the user that the wire is Live wire when fuse and switch is seen on it.

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Solution

The correct option is B To cut off the high voltage from the appliance.
When by short-circuit or any other reason current exceed its nominal value that time fuse breaks the circuit and so cuts off the high voltage from the appliance which prevent it from damage.
Fuses and switches must be fitted onto the live wire so that when it blows, it will disconnect (isolate) the appliance from the high voltage live wire.

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Similar questions

Q. A person connects too many electrical appliances to a single socket in his house. When all these electrical appliances connected to the single socket are switched on at the same time, the electric fuse of circuit blows off.
(a) What is the process of connecting too many electrical appliances to a single socket known as?
(b) Which effect of electric current is responsible for the blowing off of 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.

Q. Why is the switch for any electrical appliance always fitted on to the live wire ?

When the live and neutral wires melt and come in contact with each other , it is said that both ,the live and neutral , wires carry current to the appliance ,Why? If the live is connected to the neutral ,the current should pass directly through the neutral wire and never reach the appliance ?

Q. If two points are at different potentials , then the current will flow till the time both the points reach the same potential( without a battery).
Now the question is that - If we connect the switch in the neutral wire, when the switch is off, the appliance is connected to the higher potential through the live wire ( which was not disconnected), the current flows through the live wire to the appliance . If we now touch the appliance, we will get shock because the appliance was at higher potential and our body was at a lower potential, thus current moved Through our body. But even if we wear rubber shoes ( or some insulation between our body and earth is there) , we should get shock because the only change that happens now is that the current doesn't reach ground. But it will flow TO our body (lower potential ) from the live wire (higher potential) even if there is not a return path for current ( not a complete circuit). Why is this not true ?

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