Electricity: Magnetic and Heating Effects | Class 8 Science Notes
By ConceptScroll Team · Published on 17 July 2026 · 3 min read
Electricity: Magnetic and Heating Effects – this guide gives you a concise, exam-ready overview of Electricity: Magnetic and Heating Effects from Class 8 Science, written by ConceptScroll editors and reviewed against the latest NCERT textbook.
Probe and ponder
The introductory section of Chapter 4, "Electricity: Magnetic and Heating Effects," invites students to think critically about the properties and effects of electric current beyond just lighting a bulb. It poses intriguing questions that stimulate curiosity and set the stage for exploring the magnetic and heating effects of electric current. For instance, it asks if there are alternative ways to detect current flow without an electric lamp, whether temporary magnets can be created, how heat is generated in electrical appliances, how to determine if a cell or battery is dead, and whether all cells and batteries can be recharged. These questions encourage students to connect prior knowledge with new concepts and prepare them for hands-on experiments and deeper understanding in the chapter. The section also encourages students to share their own questions, fostering an inquiry-based learning environment.
📊 Diagram: The section includes images of electric circuits and magnetic compasses, illustrating the concept of current flow and magnetic effects.
🧪 Activity: No specific activity in this section; it sets the context for upcoming activities.
🔗 Connection: Leads to the investigation of the magnetic effect of electric current and the creation of electromagnets.
Frequently asked questions
1. Fill in the blanks: (i) The solution used in a Voltaic cell is called ______. (ii) A current carrying coil behaves like a ______.
(i) The solution used in a Voltaic cell is called electrolyte. (ii) A current carrying coil behaves like a magnet.
2. Choose the correct option: (i) Dry cells are less portable compared to Voltaic cells. (True/False) (ii) A coil becomes an electromagnet only when electric current flows through it. (True/False) (iii) An electromagnet, using a single cell, attracts more iron paper clips than the same electromagnet with a battery of 2 cells. (True/False)
(i) False. Dry cells are more portable compared to Voltaic cells because they are compact and sealed. (ii) True. A coil behaves like an electromagnet only when electric current flows through it. (iii) False. An electromagnet with a battery of 2 cells attracts more iron paper clips than with a single cell because more current produces a stronger magnetic field.
3. An electric current flows through a nichrome wire for a short time. (i) The wire becomes warm. (ii) A magnetic compass placed below the wire is deflected. Choose the correct option: (a) Only (i) is correct (b) Only (ii) is correct (c) Both (i) and (ii) are correct (d) Both (i) and (ii) are not correct
Correct option is (c) Both (i) and (ii) are correct. Explanation: (i) When electric current flows through the nichrome wire, it heats up due to the heating effect of current. (ii) The current also produces a magnetic field around the wire, which deflects the magnetic compass needle placed nearby.
4. Match the items in Column A with those in Column B. | Column A | | Column B | | | --- | --- | --- | --- | | (i) | Voltaic cell | (a) | Best suited for electric heater | | (ii) | Electric iron | (b) | Works on magnetic effect of electric current | | (iii) | Nichrome wire | (c) | Works on heating effect of electric current | | (iv) | Electromagnet | (d) | Generates electricity by chemical reactions |
Matching pairs: (i) Voltaic cell - (d) Generates electricity by chemical reactions (ii) Electric iron - (a) Best suited for electric heater (iii) Nichrome wire - (c) Works on heating effect of electric current (iv) Electromagnet - (b) Works on magnetic effect of electric current
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