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Standard X
Physics
Domestic Electric Circuits
Why is the sw...
Question

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

A
No current flows in the neutral wire.
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B
There will be a short circuit if the switch is in the earth lead.
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C
The device can never be switched off if the switch is in the neutral lead.
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D
The device can only be isolated if the switch is in the live lead
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Solution

The correct option is B The device can never be switched off if the switch is in the neutral lead.
Why is the switch for any electrical appliance always fitted on the live wire.
The answer will be→ The device can never be switched off if switch is in the neutral load.
Solution:- The live wire is always at higher potential where as neutral wire is always at zero potential.
The switch must be placed in live wire to maintain the body of appliance at zero potential in the switch off position and if the switch is kept in neutral wire, then the body of the appliance to keep the body at infinite potential in the switch on position.

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Q. In any electric circuit, when the switch is on and the current is flowing through it why do the wire, switches, bulb or devices in the circuit become hot?
Q.

A switch must be connected in the :

(a) live wire

(b) neutral wire

(c) earth wire

(d) either earth or neutral wire.


Q.

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.

What is the purpose of a switch in a circuit? Why is the switch put in the live wire? What precaution do you take while handling a switch?


Q. In an household electric circuit, which of the following is/are correct?
(A) All electric appliances drawing power are joined in parallel.
(B) A switch may be either in series or in parallel with the appliance which it controls.
(C) If a switch is in parallel with an appliance, it will draw power when the switch is in the 'off' position (open).
(D) If a switch is in parallel with an appliance, the fuse will blow (burn out) when the switch is put 'on' closed.
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