Tag: electric switch

Questions Related to electric switch

A device that is used to break or make an electric circuit is called _________.

physics household circuits electric switch switch electrical circuit

  1. potentiometer

  2. switch

  3. breaker

  4. fuse

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Correct Option: B
Explanation:
A 'switch' is an electric device that is used to make or break a circuit. When the switch is in 'OFF' position, then the circuit is not complete. Then, the circuit is called an Open circuit. An electric current cannot flow through the circuit. and vice versa.

The main function of a switch is to

physics household circuits electric switch switch electrical circuit

  1. Allow changes of flow

  2. Complete or break a circuit

  3. Make the bulb glow easily

  4. Prevent electric shocks

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Correct Option: B
Explanation:

An electrical switch is any device used to interrupt the flow of electrons in a circuit. Switches are essentially binary devices: they are either completely on (“closed”) or completely off (“open”).

A switch is always connected to the :

physics household circuits electric switch switch electrical circuit

  1. Live wire

  2. Neutral wire

  3. Earth wire

  4. None of these

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Correct Option: A
Explanation:

A switch is always connected to live wire. The purpose of the switch is to break or connect an electric circuit, but they must be correctly connected at home.

Why are switches not connected to neutral wire?

physics household circuits electric switch switch electrical circuit

  1. Because there will be overheating

  2. No current will flow through the appliance

  3. Fuse will blow

  4. All

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Correct Option: A
Explanation:

If the switches are connected to neutral wire, no current will flow through the appliance and hence it will not operate.

Commonly used switches are 

physics household circuits electric switch switch electrical circuit

  1. Clutch type

  2. Lever type

  3. Plug type

  4. All of the above

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Correct Option: B
Explanation:

Commonly used switches are lever type. By moving the lines upward, a given circuit is switched off and vice-versa.

Switches are connected to

physics household circuits electric switch switch electrical circuit

  1. Live wire

  2. Neutral wire

  3. Fuse wire

  4. All of the above

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Correct Option: A
Explanation:

When an appliance is in contact with the live wire, its heating element will be at same potential as the live wire and current will flow.

MCB are

physics household circuits electric switch switch electrical circuit

  1. Miniature circuit Breakers

  2. Switches

  3. Pulg

  4. Fuse

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Correct Option: A
Explanation:

MCB stands for Miniature circuit breakers which opens the circuit when excessive current passes through the appliance and thus prevents the appliance from any damage.

The switch used with an appliance to start or stop the flow of current in it is the

physics household circuits electric switch switch electrical circuit

  1. Double pole switch

  2. Single pole swicth

  3. MCB

  4. All

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Correct Option: B
Explanation:

Single pole switch is used with an appliance to start or stop the flow of current in it.

B). Solve the previous question if the closed loop is completely
enclosed. In the circuit containing the switch.

physics household circuits electric switch switch electrical circuit

  1.  An anticlockwise current-pulse

  2.  A clockwise current-pulse

  3.  An anticlockwise current-pulse and then an anticlockwise current-pulse

  4. A clockwise current-pulse and then an anticlockwise current-pulse

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Correct Option: C

In a household electric circuit

physics household circuits electric switch switch electrical circuit

  1. all electric appliances drawing power are joined in parallel.

  2. a switch may be either in series or in parallel with the appliance which it controls.

  3. if a switch is in parallel with an appliance, it will draw power when the switch is in the 'off' position (open).

  4. 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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Correct Option: A,C,D
Explanation:

In the household if the appliances are connected in series, if one appliance is turned off then the whole circuit breaks and all other will get turned off. So they are always connected in parallel so that we can use appliances independent of other.
The switch of an appliance must be connected in series because the purpose of a switch is to turn off/on (break and connect the circuit). So when we connect the switch in series, the appliance turn's on when switch is closed and off when open.
If the switch is connected in parallel, even when it is off(open) the appliance draws power and when it is on the terminals of the appliance gets shorted and blows the fuse.