NCERT Class 8 Science Curiosity: Chapter 4 — Electricity: Magnetic and Heating Effects
This chapter, "Electricity: Magnetic and Heating Effects," from NCERT's Class 8 Science Curiosity textbook, explores the fascinating phenomena associated with electric currents. It begins by posing intriguing questions about detecting current without a lamp, creating temporary magnets, generating heat in appliances, and identifying dead cells. The chapter introduces the concept of a working model of a lifting electromagnet, demonstrating how an electric current can produce magnetic effects. Through Activity 4.1, students are guided to investigate whether an electric current has a magnetic effect using a simple circuit, a magnetic compass, and other basic components. This hands-on approach aims to build a foundational understanding of electromagnetism and its practical applications, crucial for CBSE science learning.
Quick info
| Board | CBSE / NCERT |
|---|---|
| Class | Class 8 |
| Subject | Science |
| Book | Curiosity |
| Chapter | Chapter 4 — Electricity: Magnetic and Heating Effects |
| Language | English |
| PDF type | NCERT Textbook |
| Session | CBSE 2026 |
| Reading time | 2 minutes |
| Word count | 337 |
Learning outcomes
- Understand that electric current produces a magnetic effect.
- Investigate the magnetic effect of electric current using a compass.
- Explore the concept of temporary magnets created by electric currents.
- Identify the components needed to build a simple electric circuit.
- Relate electric current to the generation of heat in electrical appliances.
Vocabulary
| Word | Meaning |
|---|---|
| Electric circuit | A closed path through which electric current flows. |
| Electric cell | A device that provides the electric current. |
| Magnetic compass | An instrument used to detect magnetic fields and indicate direction. |
| Electromagnet | A magnet made by passing an electric current through a coil of wire wrapped around a magnetic core. |
| Magnetic material | A material that is attracted to a magnet. |
| Switch | A device used to make or break an electric circuit. |
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Practice questions
- What can be used to detect if current is flowing in an electric circuit if an electric lamp is not available? Answer: A magnetic compass can be used to detect if current is flowing.
- What is a temporary magnet made using an electric circuit called? Answer: It is called an electromagnet.
- What materials are attracted by magnets? Answer: Magnetic materials, such as iron, are attracted by magnets.
- What is the function of a switch in an electric circuit? Answer: A switch is used to make or break an electric circuit, controlling the flow of current.
Frequently asked questions
How can we detect if current is flowing in an electric circuit without a lamp?
A magnetic compass can be used. If current flows through a wire near the compass, the compass needle will deflect, indicating the presence of current.
Can temporary magnets be made using electricity?
Yes, temporary magnets called electromagnets can be made by passing an electric current through a coil of wire wrapped around a magnetic material like iron.
What is an electromagnet?
An electromagnet is a type of magnet where the magnetic field is produced by an electric current. It loses its magnetism when the current is turned off.
What materials are attracted by magnets?
Magnetic materials, such as iron, are attracted by magnets.
What is the purpose of a switch in an electric circuit?
A switch is used to control the flow of electric current by either completing (closing) or breaking (opening) the circuit.
What components are needed for Activity 4.1?
Activity 4.1 requires a magnetic compass, an electric cell, a cell holder, drawing pins, a safety pin, nails, connecting wires, and cardboard.
Related resources
Important topics
Topics covered
NCERT Class 8 Science — Curiosity — Chapter 4 — Electricity: Magnetic and Heating Effects. Verified by NCERT Help Editorial Team. Reviewed on 29 Jul 2026. Last updated 10 Aug 2026.