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# Selina solutions for Concise Physics Class 10 ICSE chapter 9 - Electrical Power and Household Circuits [Latest edition]

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## Chapter 9: Electrical Power and Household Circuits

Exercise - 9 (A)Exercise - 9 (B)

#### Selina solutions for Concise Physics Class 10 ICSE Chapter 9 Electrical Power and Household Circuits Exercise Exercise - 9 (A) [Pages 218 - 219]

Exercise - 9 (A) | Q 1 | Page 218

At what voltage and frequency is the electric power generated at the power generating station?

Exercise - 9 (A) | Q 2.1 | Page 218

At what voltage is the electric power from the generating station transmitted? Give reason to your answer.

Exercise - 9 (A) | Q 2.2 | Page 218

What is the nature of current transmitted from the power station?

Exercise - 9 (A) | Q 3 | Page 218

The voltage of power generated at the generating stations is first stepped up before its transmission. Give reason.

Exercise - 9 (A) | Q 4 | Page 218

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

Exercise - 9 (A) | Q 5 | Page 218

At what voltage and frequency is the a.c. supplied to our houses?

Exercise - 9 (A) | Q 6 | Page 218

Name the device used to (a) increase the voltage at the generating station (b) decrease the voltage at the substation for its supply.

Exercise - 9 (A) | Q 7 | Page 218

(a) Name the three connecting wires used in a household circuit
(b) Which of the two wires mentioned in part (a) are at the same potential?
(c) In which of the wire stated in part (a) the switch is connected?

Exercise - 9 (A) | Q 8 | Page 218

What is the pole fuse? Write down its current rating.

Exercise - 9 (A) | Q 9.1 | Page 218

State the function of the following in a house circuiting
kWh meter .

Exercise - 9 (A) | Q 9.2 | Page 218

State the function of the following in a house circuiting of main fuse

Exercise - 9 (A) | Q 9.3 | Page 218

State the function of  the following in a house circuiting of main switch.

Exercise - 9 (A) | Q 10 | Page 218

In what unit does the electric meter in a house measure the electrical energy consumed? What is its value in S.I unit?

Exercise - 9 (A) | Q 11 | Page 218

Where is the main fuse in a house circuit connected?

Exercise - 9 (A) | Q 12 | Page 218

State one advantage of using the main switch in house wiring.

Exercise - 9 (A) | Q 13 | Page 218

Draw a circuit diagram to expain the ring system of house wiring. State two advantage of it.

Exercise - 9 (A) | Q 14 | Page 218

Draw a labelled diagram with necessary switch, regulator, etc. to connect a bulb and a fan with the mains. In what arrangement are they connected to the mains : series or parallel?

Exercise - 9 (A) | Q 15 | Page 218

How should the electric lamps be connected with the mains so that the switching on or off a lamp has no effect on other lamps?

Exercise - 9 (A) | Q 16 | Page 219

In following figure shows three bulbs A, B and C each of rating 100 W, 220 V connected to the mains of 220 V. Answer the following:

(a) How is the bulb A connected with the mains? At what voltage does it glow?

(b) How are the bulbs B and C connected with the mains? At what the bulb A connected with the mains?

(c) How is the glow of bulbs A and C affected if bulb B gets fused?

(d) How is the glow of bulbs B and C affected if bulb A gets fused?

Exercise - 9 (A) | Q 17 | Page 219

Two sets A and B of four bulbs each are glowing in two separate rooms. When one of the bulbs in set A is fused, the other three bulbs also cease to glow. But in set B, when one bulb fuses the other bulbs continue to glow. Explain the difference.

#### Selina solutions for Concise Physics Class 10 ICSE Chapter 9 Electrical Power and Household Circuits Exercise Exercise - 9 (A) [Page 219]

Exercise - 9 (A) | Q 1 | Page 219

The main fuse is connected in :

• Live wire

• Neutral wire

• Both the live and earth wires

• Both earth and the neutral wire.

Exercise - 9 (A) | Q 2 | Page 219

The electrical appliances in a house are connected in:

• Series

• Parallel

• Either in series or parallel

• Both in series and parallel

Exercise - 9 (A) | Q 3 | Page 219

The electric meter in a house records:

• Charge

• Current

• Energy

• Power

#### Selina solutions for Concise Physics Class 10 ICSE Chapter 9 Electrical Power and Household Circuits Exercise Exercise - 9 (B), Exercise - 9 (A) [Pages 227 - 229]

Exercise - 9 (B) | Q 1 | Page 227

What is a fuse? Name the material of fuse. State on characteristic of material used for fuse.

Exercise - 9 (A) | Q 2 | Page 227

Name the device used to protect the electric circuits from over loading and short circuit. On what effect of current does it work?

Exercise - 9 (A) | Q 3.1 | Page 227

Complete the following sentence:
(A fuse is a short piece of wire of material of high …………and low ………..

Exercise - 9 (A) | Q 3.2 | Page 227

Complete the following sentence:

A fuse wire is made of an alloy of ………. and …..If the current in a circuit rises too high, the fuse wire ……….

Exercise - 9 (A) | Q 3.3 | Page 227

Complete the following sentence:

A fuse is connected in …… with the ………..wire.

Exercise - 9 (B) | Q 3.4 | Page 227

Complete the following sentence :

Higher the current rating,_______ is the fuse wire.

Exercise - 9 (B) | Q 3.5 | Page 227

Complete the following sentence :

Live wire is also called __________ wire.

Exercise - 9 (B) | Q 4 | Page 227

Why is the fuse wire fitted in a porcelain casing?

Exercise - 9 (B) | Q 5 | Page 227

How is a fuse put in an electric circuit? State the purpose of using a fuse in a circuit.

Exercise - 9 (B) | Q 6 | Page 227

Describe with the aid of a diagram some form of a fuse which is used in the electric lighting circuit of a house. Give two reasons why a fuse must not be replaced by an ordinary copper wire.

Exercise - 9 (B) | Q 7 | Page 227

A fuse is always connected to the live wire of the circuit. Explain the reason.

Exercise - 9 (B) | Q 8 | Page 227

How does the (i) thickness and (ii) length of a fuse wire depend on its current rating

Exercise - 9 (B) | Q 9 | Page 227

Two fuse wire of same length are rated 5 A and 20 A. Which of the two is thicker and why?

Exercise - 9 (B) | Q 10 | Page 227

Explain the meaning of the statement ‘the current rating of a fuse is 5 A’.

Exercise - 9 (B) | Q 11 | Page 227

‘A fuse is rated 8 A’. can it be used with an electrical appliance of rating 5kW, 200V?

Exercise - 9 (B) | Q 12 | Page 227

An electric kettle is rated 3 kW, 250 V. give reason whether this kettle can be used in a circuit
which contains a 13 A fuse.

Exercise - 9 (B) | Q 13 | Page 227

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?

Exercise - 9 (B) | Q 14 | Page 228

A switch is not touched with wet hands while putting it on or off. Give a reason for your answer.

Exercise - 9 (B) | Q 15 | Page 228

It is dangerous to connect the switch in the neutral wire. Explain your answer.

Exercise - 9 (B) | Q 16 | Page 228

Draw a circuit diagram using the dual control switches to light a staircase electric light and explain its working.

Exercise - 9 (B) | Q 16 | Page 228

What purpose is served by the terminals of a three way pin plug? Draw a diagram and name the pins

Exercise - 9 (B) | Q 18 | Page 228

The diagram in Fig. 9.27 shows a three pin plug. Label the three pins.
(a) why if the top pin thicker and longer than the other two?
(b) why are the pins splitted at the ends?

Exercise - 9 (B) | Q 19 | Page 228

Draw a Labelled Diagram of a Three Pin Socket.

Exercise - 9 (B) | Q 20 | Page 228

The following diagram shows a three pin socket marked as 1, 2 and 3.

(a) Identify and write live (L) neutral (N) and earth (E) against the correct number
(b) To which part of the appliance is the terminal 1 connected?
(c) To which wire joined to 2 or 3, is the fuse connected and why?

Exercise - 9 (B) | Q 21 | Page 228

What do you mean by the term local earthing? Explain how it is done.

Exercise - 9 (B) | Q 22 | Page 228

To which wire is the metallic case of an electric appliance connected? give the reason?

Exercise - 9 (B) | Q 23 | Page 228

(a) the earthing of an electric appliance is useful only if the fuse is in the love wire. Explain the reason.
(b) Name the part of the appliance which is earthed.

Exercise - 9 (B) | Q 24 | Page 228

For earthing an electrical appliance, one has to remove the paint from the metal body of the appliance where the electrical contact is made. Explain the reason.

Exercise - 9 (B) | Q 25 | Page 228

What is the colour code for the insulation on the (a) live (b) neutral and (c) earth wire?

Exercise - 9 (B) | Q 26 | Page 228

Name the colour code of the wire which is connected to (i) metallic body of an appliance, (ii) switch for the appliance.

Exercise - 9 (B) | Q 27 | Page 228

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

Exercise - 9 (B) | Q 28 | Page 228

A power circuit uses a cable having three different wires.
(a) Name the three wires of the cable.
(b) to which of the two wires should the heating element of an electric geyser be connected?
(c) To which wire should the metal case of the geyser be connected?
(d) to which wire should the switch and fuse be connected?

Exercise - 9 (B) | Q 29 | Page 228

State two circumstances when one may get an electric shock from an electrical gadget. What preventive measure must be provided with the gadget to avoid it?

Exercise - 9 (B) | Q 30 | Page 228

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

Exercise - 9 (B) | Q 31 | Page 228

Give two characteristic of a high tension wire.

Exercise - 9 (B) | Q 32 | Page 228

Which of the cables, one rated 5 A and the other 15 A will be of thicker wire? Give a reason for your answer.

Exercise - 9 (B) | Q 33 | Page 228

The following diagram shows three lamps and three switches 1, 2 and 3
(a) Name the switch / switches to be closed so as to light all the three lamps.
(b) How are the lamps connected: in series or in parallel?

Exercise - 9 (B) | Q 34.1 | Page 229

In following Figure shows two bulbs with switches and fuse connected to mains through a socket.
label each component

Exercise - 9 (B) | Q 34.2 | Page 229

In following figure shows two bulbs with switches and fuse connected to mains through a socket.

Name and state the colour of insulation of each wire 1, 2 and 3.

Exercise - 9 (B) | Q 34.3 | Page 229

In following figure shows two bulbs with switches and fuse connected to mains through a socket.

How are the two bulbs joined: in series or in parallel?

#### Selina solutions for Concise Physics Class 10 ICSE Chapter 9 Electrical Power and Household Circuits Exercise Exercise - 9 (B) [Page 229]

Exercise - 9 (B) | Q 1 | Page 229

The rating of a fuse connected in the lighting circuit is :

• 15 A

• 5 A

• 10 A

• Zero

Exercise - 9 (B) | Q 2 | Page 229

A switch must be connected in :

• Live wire

• Neutral wire

• Earth wire

• Either earth or neutral wire

## Chapter 9: Electrical Power and Household Circuits

Exercise - 9 (A)Exercise - 9 (B)

## Selina solutions for Concise Physics Class 10 ICSE chapter 9 - Electrical Power and Household Circuits

Selina solutions for Concise Physics Class 10 ICSE chapter 9 (Electrical Power and Household Circuits) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CISCE Concise Physics Class 10 ICSE solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Concise Physics Class 10 ICSE chapter 9 Electrical Power and Household Circuits are Household Circuits - Colour Coding of Wires, Household Circuits - Three-pin Plugs, Household Circuits - Safety Precautions, Household Circuits - Earthing;, Household Circuits - Fuses, Household Circuits - Switches, Household Circuits – Main Circuit, Electrical Energy and Power, Concept of Electrical Power and Household Circuits Numericals.

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