Electric Current and Its Effects - Questions and Answers
Class 7 Science Part 2 Chapter 5
Assam State Education Board Syllabus 2025-2026 Covered
This chapter explains the concepts of electric current, its effects, and applications in daily life. Below are the important questions and answers from NCERT & SCERT Assam Class 7 Science Chapter 5 - Electric Current and Its Effects, based on the Assam State Education Board syllabus for 2025-2026.
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Join Our WhatsAppIntroduction to Electric Current and Its Effects
- Electric current is the flow of electric charge through a conductor.
- It produces heating and magnetic effects.
- It is widely used in appliances, circuits, and electromagnets.
Class 7 Science Question Answer – Part 2
Below are the chapters of Class 7 Science Part 2. Click on the chapter name to access the respective question-and-answer content:
- Fibre to Fabric
- Respiration in Organisms
- Transportation in Animals and Plants
- Reproduction in Plants
- Electric Current and its Effects
- Light
- Water: A Precious Resource
- Forests: Our Lifeline
- Wastewater Story
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 Fig.14.21.
3. Fig.14.22 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.
4. The bulb in the circuit shown in Fig.14.23 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.
Ans:- Two Effects of Electric Current are -
i) Heating effect of electric current
ii) Magnetic effect of electric current
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 switched on through a wire, the magnetic field is created around it hence we see deflection in the compass needle kept nearby.
7. Will the compass needle show deflection when the switch in the circuit shown by Fig.14.24 is closed?
No, the compass needle does not show deflection when the circuit is closed, and the magnetic field is not created until the current is flowing through the circuit.
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 the current is switched ‘on’ in a room heater, it _______.
(d) The safety device based on the heating effect of electric current is called a ______.
Ans:-
(a) Longer line in the symbol for a cell represents its positive terminal.
(b) The combination of two or more cells is called a battery.
(c) When the 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 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. (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)
Ans:-
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.
Ans:- No, because plastic does not have the magnetic property to get attracted to a magnet; hence magnet cannot be used to separate plastic bags.
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:- It is not a wise idea to replace the fuse with a piece of wire, as it has a very low melting point. In the case of the metal piece, the melting point will be high, and the circuit will be intact in case there is overload or overheating.
12. 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 to identify the possible defects in the circuit.
i) The connecting wire may be loose
ii) The electric cell may be used up
iii) Switch may not be functioning well
iv) Cell power has been exhausted
13. In the circuit shown in Fig. 14.25
(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?
Ans:-
i) No, the bulb will not glow as the circuit is not complete when the switch is off.
ii) If the switch is ‘ON’, all the bulbs glow simultaneously.
Class 7 Science Chapter 5 - Important Questions & Answers
Q1: What is electric current?
Answer: Electric current is the flow of electric charges (electrons) through a conductor, such as a wire.
Q2: What are the effects of electric current?
Answer: The two main effects of electric current are:
- Heating effect (used in electric heaters, irons, bulbs).
- Magnetic effect (used in electromagnets, electric bells, motors).
Q3: What is the heating effect of electric current?
Answer: When electric current passes through a wire, it gets heated. This is known as the heating effect of electric current. Examples include electric bulbs and heaters.
Q4: How does an electric fuse work?
Answer: An electric fuse is a safety device that prevents excessive current flow. It contains a thin wire that melts when the current is too high, breaking the circuit and preventing damage.
Q5: What is the magnetic effect of electric current?
Answer: When electric current flows through a conductor, it produces a magnetic field around it. This effect is used in electromagnets and electric bells.
Q6: What is an electromagnet? How is it made?
Answer: An electromagnet is a temporary magnet created by passing electric current through a coil of wire wrapped around an iron core. It is used in cranes, electric bells, and motors.
Q7: What is an electric circuit?
Answer: An electric circuit is a closed path through which electric current flows. It consists of components like a battery, wires, a switch, and an appliance.
Q8: What is the difference between a closed and an open circuit?
Closed Circuit
Open Circuit
The switch is ON, and current flows.
The switch is OFF, and no current flows.
The appliance works.
The appliance does not work.
Q9: How does an electric bell work?
| Closed Circuit | Open Circuit |
|---|---|
| The switch is ON, and current flows. | The switch is OFF, and no current flows. |
| The appliance works. | The appliance does not work. |
Answer: An electric bell works using the magnetic effect of electric current. When current flows, an electromagnet attracts a metal strip, causing a hammer to strike the bell. When the circuit breaks, the hammer returns, and the cycle repeats.
Q10: What materials are good conductors and insulators?
Answer:
- Good conductors: Allow electricity to flow easily (e.g., copper, aluminum, silver).
- Insulators: Do not allow electricity to flow (e.g., plastic, rubber, wood).
Q11: Why is an electric fuse important in household wiring?
Answer: The fuse prevents short circuits and electrical fires by breaking the circuit if excessive current flows.
Q12: What is a filament in an electric bulb?
Answer: The filament is a thin wire inside the bulb (usually tungsten) that glows and produces light when heated by electric current.
FAQs on Electric Current and Its Effects
Q1: Why does a bulb glow when the switch is turned on?
Answer: When the switch is ON, electric current flows through the filament, heating it up and making it glow.
Q2: What is a short circuit?
Answer: A short circuit occurs when the wires touch each other, causing excessive current flow and potential fire hazards.
Q3: Why is rubber used as an insulator?
Answer: Rubber does not allow electric current to pass through, making it safe for handling electrical equipment.
Q4: What are some uses of electromagnets?
Answer: Electromagnets are used in electric bells, cranes, motors, and MRI machines.
Q5: How can we reduce energy wastage in electrical appliances?
Answer: By using energy-efficient devices, turning off unused appliances, and maintaining proper wiring.
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