NCERT Solutions for Class 7 Science Chapter 10 - Electric Current and Its Effects

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 ON position, and battery.

Ans: The symbols for the following component of electric circuits are:

Connecting wire: 

Switch in the Off position:

Bulb:

Cell:

Switch in ON position:

Battery:

2) Draw the circuit diagram to represent the circuit shown in Fig. 10.21

Ans: The circuit diagram for the above representation can be drawn by connecting a bulb, cell, and switch in on mode. Hence, the circuit diagram will be;

3. Fig. 10.22. 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.

Ans: The cells are connected to each other to make a battery. In, a battery the negative end of a cell is connected to the positive end of the other cell. Hence, the cells are connected by opposite ends to make a battery.

4. The bulb in the circuit shown in Fig. 10.23 does not glow. Can you indicate the problem? Make necessary changes in the circuit to make the bulb glow.  

Ans: The bulb is not glowing because the cell is not Connecting systematically, the cells of a battery should be connected by opposite ends. So, the correct connection of the circuit will be:

Hence, the bulb will grow after connecting the negative terminal of a cell to the positive terminal of another cell.

5. Name any two effects of electric current.

Ans: When an electric current is passed through any device or wire, then it shows heating and magnetic effect through the wire.

Hence, the two effects of electric current are the heating effect and 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.

Ans: When the current is passed through a wire then the wire behaves like a tiny magnet. This is called the magnetic effect of current. So, when we keep a compass needle near that current flowing wire, it gets deflected from its north-south position due to the magnetic field produced by the wire.

7. Will the compass needle show the deflection when the switch in the circuit shown by Fig. 10.24 is closed?

Ans: When the switch of the circuit is in a closed position then the circuit is not complete and no flow of current will take place in this case. No flow of current means no magnetic field produced. The compass needle shows deflection only in the presence of a magnetic field. Hence, the compass needle did not show deflection when the switch was off.

8. Fill in the blanks

a) Longer line in the symbol represents the __________terminal.

Ans: Longer line in the symbol represents the positive terminal.

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

Ans: The combination of two or more cells is called battery.

c) When a current is switched ON in a room heater, it _________.

Ans: When a current is switched ON in a room heater, it produces heat.

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

Ans: The safety device based on the heating effect of electric current is called a 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. 

Ans: F

b) When the current through the fuse exceeds a certain limit, the fuse wire melts and breaks.

Ans: T

c) An electromagnet does not attract a piece of iron.

Ans: F

d) An electric bell has an electromagnet.

Ans: T

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

Ans: An electromagnet can be made by flowing electricity through the conductor or wire. It only attracts electromagnetic materials like iron. It does not attract plastic or plastic bags. So, it cannot be used to separate plastic bags from the garbage as it is not attracted by an electromagnet.

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

Ans: The fuse is made of a very low melting point wire So when the amount of electricity exceeds a limited amount of electricity. Then it melts and breaks, So our home is safe from short circuits.  But the melting point of the metallic wire is high and it won't melt and break when the amount of electricity exceeds. So, we did not allow him to replace the fuse with a wire.

12. Zubeda made an electric circuit using a cell holder shown in Fig. 10.4, 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.

Ans:  There can be several defects in a circuit due to which the bulb does not glow. Some of the common defects may be;

i) The connection of the wire to the cell and bulb may be loose.

ii) The cell used in the circuit may be used up.

iii) The switch is defective.

iv) The bulb is fused.

13. In the circuit shown in Fig. 10.25.

i) Would any of the bulbs glow when the switch is in the ‘OF’ position?

Ans: When the switch is off then the circuit will be incomplete and no current will flow through the circuit. So, the bulb will not glow.

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

Ans: When the switch is on then the current flows through the circuit very quickly and all three bulbs will glow at the same time.

Class 7 Science Electric Current and Its Effects - Quick Overview of Detailed Structure of Topics 

Class 7 Electric Current and Its Effects - Important Points

• Electric Current: The flow of electric charge (electrons) through a conductor.

• Electric Circuit: A complete path through which electric current can flow, consisting of a power source, conductors, and a load.

• Heating Effect: When electric current flows through a conductor, it generates heat. Applications include electric heaters, irons, and toasters.

• Magnetic Effect: Electric current can produce a magnetic field, which electromagnets can demonstrate. Applications include electric bells, motors, and transformers.

• Electric Bulb: Utilises the heating effect of current to produce light.

• Electromagnet: Utilises the magnetic effect of current to perform tasks like lifting heavy iron objects.

Benefits of Vedantu’s NCERT Class 7 Science Chapter 10 Question Answer 

• Vedantu's Electric Current And Its Effects Class 7 Question Answer provides a comprehensive guide to understanding the concepts of electric current and its effects, ensuring students grasp the fundamental principles thoroughly.

• Class 7 Science Chapter 10 explains the workings of electric circuits, the role of various components like cells, switches, and bulbs, and how they function together to form a complete circuit.

• Each solution is presented step-by-step, enhancing students' problem-solving skills and helping them understand the chapter's content better.

• Vedantu's electric current and its effects class 7 question answer focus on building a strong foundation in electrical concepts, making it easier for students to understand more complex topics in higher classes.

• Electric Current And Its Effects Question Answer explores the heating effect of electric current and its applications in daily life, such as in electric heaters and bulbs.

• Using Vedantu's Electric Current and Its Effects Class 7 Solutions helps improve academic performance and boosts confidence in handling questions related to electric circuits and their practical applications.

Related Study Materials for Class 7 Science Chapter 10 Electric Current and Its Effects

Students can obtain Study Materials for Class 7 Electric Current and Its Effects. These additional resources can be downloaded for further reference.

Conclusion

Vedantu’s NCERT Solutions for Class 7 Science Chapter 10 - Electric Current and Its Effects is an important study material for class 7 students. They help students understand important concepts like electric circuits, the heating effects of electric current, and magnetic effects. Focusing on these areas is key to mastering the chapter. The solutions simplify complex ideas, making them easy to grasp. Last year’s question paper included 5 questions from this chapter, highlighting its importance in exams. Using Vedantu’s solutions ensures students are well-prepared, confident, and capable of scoring high marks on their assessments.

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