Lakhmir Singh solutions for फिज़िक्स [इंग्रजी] इयत्ता १० आईसीएसई chapter 9 - Household Circuits [Latest edition]

Which two of the three connecting wires in a household circuit are at the same potential? Explain.

In which of the three connecting wires in a household circuit should the switch be connected?

Explain the ring system of electric wiring.

Write the advantages of the ring system.

State whether the following statement is true or false.

In electrical appliances, the metallic part is earthed.

State whether the following statement is true or false.

Live and earthed wires are at the same potential.

State whether the following statement is true or false.

The relation for energy consumed by an electrical appliance in kWh is `("Power" xx "Time")/1000`.

The main fuse is connected in ______.

The electrical appliances in a house are connected in ______.

Live wire is also called ______ wire.

The earth wire is ______ earthed.

Electric power is generated at a voltage of ______ at a power station.

Why is the main fuse connected in the live wire before the ring system? Explain.

What is a fuse? 

Name the material of fuse. State one characteristic of the material used for fuse.

State whether the following statement is true or false.

The main fuse is connected in the earth wire.

State whether the following statement is true or false.

A switch is connected to the live wire.

State whether the following statement is true or false.

It is dangerous to connect the switch to the neutral wire.

The rating of a fuse connected in the lighting circuit is ______.

A switch must be connected in ______.

A fuse is a short piece of wire of high ______ and low ______.

Higher the current rating, _______ is the fuse wire.

Write true or false for a given statement.

A switch is an on-off device in an electric circuit.

True or False.

A fuse is a material of low melting point.

True or False.

The wiring in the ring system is cheaper than the other types of wiring.

True or False.

The colour coding of an earth wire is red or brown.

True or False.

Earthing is necessary for the electrical appliances.

A fuse wire is made of an alloy of ______ and ______.

A fuse is connected in ______ with the ______ wire.

The earth wire should be connected to the ______ of an appliance.

In the new convention, fuse wire is represented by ______ colour.

In the three-pin plug, the thicker pin represents ______.

The alternating current is supplied to our house at ______.

Circuit Breaker Device which can be used in place of fuse in domestic electric wiring is called ______.

The electrical appliances in a house are connected in ______.

In our house, the consumption of energy is recorded by ______.

The rating of a fuse connected in the lighting circuit is ______.

Match the items of column I with that of column II and choose the appropriate code.

Why are the domestic electrical connections made in parallel?

What is a fuse? 

What is the purpose of a fuse in an electrical circuit?

Which part of an electrical appliance is earthed?

What will happen if switch is connected in ‘neutral wire’?

State the reason why, in a three-pin plug, the earth pin is longer and thicker than the other two.

Name two safety devices which are connected to the live wire of a household electric circuit.

The figure shows a three-pin socket. Mark the earth, live and neutral holes in it.

Why is it necessary to have an earth wire installed in a power circuit, but not in a lighting circuit?

How does the colour code of wires in a cable help in house wiring?

Name the three connecting wires used in a household circuit.

Explain with the aid of a simple diagram, the transmission of electric power from the generating station to your house.

What is a double-pole switch?

Draw diagrams to explain the working of a double-pole switching.

State any two properties of fuse material that make it suitable for use in an electric circuit.

Name two safety devices that are connected to the live wire of a household electrical circuit and give one important function of each of these two devices.

(i) Two sets A and B, of three bulbs each, are glowing in two separate rooms. When one of the bulbs in set A is fused, the other two bulbs also cease to glow. But in set B, when one bulb fuses, the other two bulbs continue to glow. Explain why this phenomenon occurs.

(ii) Why do we prefer arrangements of Set B for house circuiting?

To which wire of a cable in a power circuit should the metal case of the geyser be connected?

To which wire should the fuse be connected?

How does the colour code of wires in a cable help in house wiring?

In the given figure, two bulbs with switches and fuses are connected to the mains through a three-pin socket by means of a three-wire cable.

1. Label each component: bulb, switch, fuse and socket.
2. Name and state the colour of each wire 1, 2 and 3.

1. Why did Raman put off the main switch quickly?
2. What name is given to the red, black and green wires of the connecting cord?
3. Which wire, red, black or green, touched the metal case of the electric kettle when Raman's mother got an electric shock?
4. Which safety device was not working in the electric kettle circuit which could have prevented the electric shock?
5. What values are displayed by Raman in this incident?

Inspect the wiring in a room in your house. Find out how the fan, lights and plug points are connected with the Mains supply. Draw a circuit diagram based on your observations. Is your circuit diagram similar to the circuit we had learned in the chapter?