Class 8 Science Chapter 4, Electricity: Magnetic and Heating Effects, follows Mohini and Aakarsh at a school science exhibition to investigate two major effects of electric current—magnetism and heat—and how cells and batteries generate electricity.
What Class 8 Science Chapter 4 Covers
4.1 Does an Electric Current Have a Magnetic Effect? uses compass-needle deflection near a current-carrying wire (Activities 4.1 to 4.4) to introduce the magnetic effect of electric current and how to wind and test an electromagnet.
4.2 Does a Current Carrying Wire Get Hot? investigates the heating effect of electric current (Activity 4.5), why heating elements glow in appliances, and electrical safety.
4.3 How Does a Battery Generate Electricity? starts from early voltaic cells and constructs a simple cell (Activity 4.6), explaining primary and rechargeable secondary batteries.
Exercises in Chapter 4
- Keep the curiosity alive end-of-chapter questions and reasoning exercises.
- Discover, design, and debate and Projects for hands-on investigation.
Read Class 8 Science Chapter 4 Online
More Chapters
- Previous: Chapter 3: Health: The Ultimate Treasure
- Next: Chapter 5: Exploring Forces
- Hindi medium: Class 8 Science Chapter 4 PDF in Hindi (Jigyasa)
- All Science chapters and the other Class 8 books: Class 8 NCERT books 2026-27
- All Class 1 to 12 NCERT Textbooks: NCERT Books PDF (Class 1–12)
FAQ
What is an electromagnet in Class 8 Science Chapter 4?
A temporary magnet made by passing an electric current through a coil of insulated wire wound around an iron core; its magnetism disappears when the current stops.
What are the two main effects of electric current studied in Chapter 4?
The magnetic effect of electric current (used in electromagnets) and the heating effect of electric current (used in heaters and irons).