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# Solutions 14. Electric Current and its Effects - NCERT Exercise | Class 7 Science - Toppers Study

Topper Study classes prepares ncert solutions on practical base problems and comes out with the best result that helps the students and teachers as well as tutors and so many ecademic coaching classes that they need in practical life. Our ncert solutions for Solutions 14. Electric Current and its Effects - NCERT Exercise | Class 7 Science - Toppers Study is the best material for English Medium students cbse board and other state boards students.

## Solutions 14. Electric Current and its Effects - NCERT Exercise | Class 7 Science - Toppers Study

CBSE board students who preparing for class 7 ncert solutions maths and Science solved exercise chapter 14. Electric Current and its Effects available and this helps in upcoming exams 2023-2024.

### You can Find Science solution Class 7 Chapter 14. Electric Current and its Effects

• All Chapter review quick revision notes for chapter 14. Electric Current and its Effects Class 7
• NCERT Solutions And Textual questions Answers Class 7 Science
• Extra NCERT Book questions Answers Class 7 Science
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Chapter 14 Science class 7

### NCERT Exercise class 7 Science Chapter 14. Electric Current and its Effects

• Solutions 14. Electric Current And Its Effects - NCERT Exercise | Class 7 Science - Toppers Study
• Class 7 Ncert Solutions
• Solution Chapter 14. Electric Current And Its Effects Class 7
• Solutions Class 7
• Chapter 14. Electric Current And Its Effects NCERT Exercise Class 7

## Exercise

1. Draw in your notebook the symbols to represent the following components of electrical circuits: connecting wires, switch in the ‘OFF’ position, bulb, cell, switch in the ‘ON’ position, and battery

2. Draw the circuit diagram to represent the circuit shown in.

3. shows four cells fixed on a board. Draw lines to indicate how you will connect their terminals with wires to make a battery of four cells.

4. The bulb in the circuit shown in does not glow. Can you identify the problem? Make necessary changes in the circuit to make the bulb glow.

5. Name any two effects of electric current.

(i) Heating effect, (ii) Magnetic effect.

6. When the current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain.

When electric current passes through a wire, it behaves like a magnet. this is the ellectric current. So, the compass needle which is a magnet, gets deflected.

7. Will the compass needle show deflection when the switch in the circuit shown by  is closed?

8. 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___________ .

(a) positive, (b) battery, (c) gets effected, (d) fuse.

9. 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)

(a) false, (b) true, (c) false, (d) true.

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

No. Electromagnet do not attract plastic.

11. 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.

No. The wire may not melt even if high current flows through it. So, it will not prevent the damage done by high current.

12. Zubeda made an electric circuit using a cell holder shown in , 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.

(i) Bulb taken would be fuse.

(ii) Cell taken could be exhausted.

(iii) In cell holder, she would have connected the same terminal of the cells.

13. In the circuit shown in

(i) Would any of the bulb glow when the switch is in the ‘OFF’ position?

(ii) What will be the order in which the bulbs A, B and C will glow when the switch is moved to the ‘ON’ position?