Please give me answer these Questions 7, Write any four appliances based on the heating effect of current.
8. How does an electric bulb glow?
9. Name the substance used to make a filament of bulb and why?
10, What is an electric fuse? How is it useful in an electric circuit?
Write the metals used to make a fuse. Is the melting point of fuse wire low? Why?
12, What happens when a compass needle is brought near a current carrying wire'?
13. How can you construct an electromagnet?
14. Write any two applications of electromagnets.
15. Describe the working of an electric bell.