Class 8 Science — Chapter 4: Electricity: Magnetic and Heating Effects

What you'll learn

• ▸Magnetic Effect of Electric Current
• ▸Electromagnets and their Construction
• ▸Properties of Electromagnets
• ▸Controlling Electromagnet Strength and Polarity
• ▸Magnetic Field
• ▸Applications of Electromagnets
• ▸Earth's Magnetism

Chapter Summary

--- PAGE 1 --- Science Exhibition Lifting Electromagnet Electricity: Magnetic and Heating Effects 4 0877CH04 Probe and ponder * If we don't have an electric lamp while making an electric circuit with an electric cell, is there any other way through which we can find out if current is flowing in the circuit? * Is it possible to make temporary magnets? How can these be made? * We can generate heat by burning fossil fuels and wood; but how is heat generated in various electrical appliances? * How do we know if a cell or a battery is dead? Can all cells and batteries be recharged? * Share your questions _________________________ ? --- PAGE 2 --- Chapter 4 – Electricity: Magnetic and Heating Effects 47 It was the day of the science exhibition, and the school was buzzing with energy. Mohini and Aakarsh, along with their friends, went from one exhibit to another, eagerly exploring different models, asking questions and taking notes. One simple model really fascinated them. It…

Practice Questions from this Chapter

Tap "Get Solution" on any question to ask our AI tutor.

1. Build an electromagnet easily? Get Solution →
2. Explain magnetic fields simply? Get Solution →
3. How do electric motors work? Get Solution →
4. Who is the scientist credited with discovering the link between electricity and magnetism in 1820? Get Solution →
5. What is a coil of wire that behaves as a magnet when electric current flows through it called? Get Solution →
6. According to Activity 4.1, what happens to a magnetic compass needle placed near a wire when current starts to flow through the wire? Get Solution →
7. What happens to the magnetic property of an electromagnet when the electric current is stopped? Get Solution →
8. To make an electromagnet stronger, what material is commonly inserted into the core of the coil? Get Solution →

Did you know?

• 💡 Electric eels generate electric shocks powerful enough to stun prey.
• 💡 The Earth's invisible magnetic field helps protect our planet from space radiation.
• 💡 Maglev trains float above tracks using powerful electromagnets, reaching incredible speeds.
• 💡 Some migrating birds navigate across continents by sensing the Earth's magnetic field.
• 💡 Hans Christian Oersted accidentally discovered the link between electricity and magnetism in 1820.

Frequently Asked Questions

Related Chapters