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Overloading and Short circuiting

A person felt...

Question

A person felt an electric shock when he touched an electrical appliance even though it was switched off. What could be the reason?

A

Excess current was flowing in the circuit

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B

Switched is connected to live wire.

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C

Switch was connected to neutral wire

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D

Fuse had blown off

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Solution

The correct option is A Excess current was flowing in the circuit
As the live wire is directly connected to the appliance, as soon as the person touches it, the circuit gets completed through ground and hence he gets a shock.

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Similar questions

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 ?

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?

Q. In an electric iron being used in a household, the plastic insulation of live wire and neutral wire in the connecting cable gets torn. Due to this, naked live wire touches the naked neutral wire directly and the electric fuse of the circuit blows off.
(a) What term is used to indicate the touching of naked live wire and neutral wire directly?
(b) When the naked wires touch each other directly, what happens to the resistance of the circuit so formed?
(c) What happens to the current flowing through the wires under these conditions?
(d) Which wire connected to the body of an electric iron protects the person using this electric iron from electric shock?

Write true or false for each statement:

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

(b) Flow of protons constitutes electric current.

(c) A fuse wire is made of silver.

(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. When an electrical appliance is switched off, sparking occurs. Why?

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