NCERT Class 7 Science Electric Current and its Effects

Read and download NCERT Class 7 Science Electric Current and its Effects in NCERT book for Class 7 Science. You can download latest NCERT eBooks chapter wise in PDF format free from Studiestoday.com. This Science textbook for Class 7 is designed by NCERT and is very useful for students. Please also refer to the NCERT solutions for Class 7 Science to understand the answers of the exercise questions given at the end of this chapter

NCERT Book for Class 7 Science Chapter 14 Electric Current and its Effects

Class 7 Science students should refer to the following NCERT Book Chapter 14 Electric Current and its Effects in Class 7. This NCERT Book for Class 7 Science will be very useful for exams and help you to score good marks

Chapter 14 Electric Current and its Effects NCERT Book Class 7

 

14.Electric Current and its

 Effects

You might have tried the game ‘How steady is your hand?’ suggested in Chapter 12 of Class VI. If not, you may try it out now. Paheli and Boojho had also set up the game by connecting an electric circuit as suggested in Class VI. They had lots of fun trying it out with their families and friends. They enjoyed it so much that they decided to suggest it to a cousin of theirs who stayed in a different town. So, Paheli made a neat drawing showing how the various electric components were to be connected (Fig.14.1).

Can you draw this circuit conveniently? It made Boojho wonder if there was an easier way to represent these electric components.

14.1 SYMBOLS OF ELECTRIC COMPONENTS

Some common electric components can be represented by symbols. In Table 14.1, some electric components and their symbols are shown. You may come across different symbols for these components in different books. However, in this book, we shall be using the symbols shown here.

Look at the symbols carefully. In the symbol for the electric cell, notice that there is a longer line and a shorter but thicker parallel line. Do you recall that an electric cell has a positive terminal and a negative terminal? In the symbol of the electric cell, the longer line represents the positive terminal and the thicker, shorter line represents the negative terminal. For a switch the ‘ON’ position and the ‘OFF’ position are represented by the symbols as shown. The wires used to connect the various components in a circuit are represented by lines.

Exercises

1. Fill in the blanks:

(a) Longer line in the symbol for a cell represents its terminal.

(b) The combination of two or more cells is called a .

(c) When current is switched ‘on’ in a room heater, it .

(d) The safety device based on the heating effect of electric current is called a .

2. Mark ‘T’ if the statement is true and ‘F’ if it is false:

(a) To make a battery of two cells, the negative terminal of one cell is connected to the negative terminal of the other cell. (T/F)

(b) When the electric current through the fuse exceeds a certain limit, the fuse wire melts and breaks. (T/F)

(c) An electromagnet does not attract a piece of iron. (T/F)

(d) An electric bell has an electromagnet. (T/F)

3. Do you think an electromagnet can be used for separating plastic bags from a garbage heap? Explain.

4. An electrician is carrying out some repairs in your house. He wants to replace a fuse by a piece of wire. Would you agree? Give reasons for your response.

5. Zubeda made an electric circuit using a cell holder shown in Fig. 14.4, a switch and a bulb. When she put the switch in the ‘ON’ position, the bulb did not glow. Help Zubeda in identifying the possible defects in the circuit


Please refer to attached file for NCERT Class 7 Science Electric Current and its Effects

Chapter 01 Nutrition in Plants
NCERT Class 7 Science Nutrition in Plants
Chapter 02 Nutrition in Animals
NCERT Class 7 Science Nutrition in Animals
Chapter 03 Fibre to Fabric
NCERT Class 7 Science Fibre to Fabric
Chapter 05 Acids, Bases and Salts
NCERT Class 7 Science Acids Bases and Salts
Chapter 06 Physical and Chemical Changes
NCERT Class 7 Science Physical and Chemical Changes
Chapter 07 Weather, Climate and Adaptations of Animals to Climate
NCERT Class 7 Science Weather Climate and Adaptation
Chapter 08 Winds, Storms and Cyclones
NCERT Class 7 Science Winds Storms and Cyclones
Chapter 10 Respiration in Organisms
NCERT Class 7 Science Respiration in Organisms
Chapter 11 Transportation in Animals
NCERT Class 7 Science Transportation in Animals
Chapter 12 Reproduction in Plants
NCERT Class 7 Science Reproduction in Plants
Chapter 13 Motion and Time
NCERT Class 7 Science Motion and Time
Chapter 14 Electric Current and its Effects
NCERT Class 7 Science Electric Current and its Effects
Chapter 16 Water: A Precious Resource
NCERT Class 7 Science Water A Precious Resource
Chapter 17 Forests: Our Lifeline
NCERT Class 7 Science Forests Our Lifeline
Chapter 18 Wastewater Story
NCERT Class 7 Science Wastewater Story

Science NCERT Book Class 7 Chapter 14 Electric Current and its Effects

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NCERT Book Class 7 Science Chapter 14 Electric Current and its Effects

The latest NCERT book for Chapter 14 Electric Current and its Effects pdf have been published by NCERT based on the latest research done for each topic which has to be taught to students in all classes. The books for Class 7 Science Chapter 14 Electric Current and its Effects are designed to enhance the overall understanding of students. All Class 7 NCERT textbooks have been written in an easy to understand language which will help to enhance the overall level of Class 7 students. 

Chapter 14 Electric Current and its Effects NCERT Book Class 7 Science

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Class 7 Science Chapter 14 Electric Current and its Effects NCERT Book

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Class 7 Chapter 14 Electric Current and its Effects NCERT Book Science

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