CBSE · Class 8 · Science · Chapter 4

Electricity: Magnetic and Heating Effects

Investigate the magnetic and heating effects of electric current and their practical applications.

7 lessons 40 min
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Lessons in this chapter

  1. 1Electric Current and Magnetic FieldsDiscover how a simple compass reveals the magnetic field produced by electric current.
  2. 2Making an ElectromagnetBuild the idea of an electromagnet step by step, from a current-carrying coil to a stronger iron-core magnet.
  3. 3Controlling and Using ElectromagnetsLearn how the strength and poles of an electromagnet can be controlled and put to practical use.
  4. 4Heating Effect of Electric CurrentFollow the path from resistance in a wire to useful heating in appliances and unwanted overheating in circuits.
  5. 5How Electric Cells Produce ElectricityLook inside a simple electric cell to see how electrodes, an electrolyte and chemical reactions produce current.
  6. 6Dry Cells and Rechargeable BatteriesCompare everyday cells and rechargeable batteries, then examine why ageing, materials and recycling matter.
  7. 7Chapter Summary and PracticeBring the whole chapter together by connecting cells, current, magnetism, heating, applications and mixed reasoning problems.
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