Q1. Fill in the blanks.
i. Longer line in the symbol for a cell represents its _________terminal.
ii. The combination of two or more cells is called a _____________.
iii. When current is switched ‘on’ in a room heater, it ______________.
iv. The safety device based on the heating effect of electric current is called a _________.
i. To make a battery of two cells, the negative terminal of one cell is connected to the negative terminal of the other cell. __________
ii. When the electric current through the fuse exceeds a certain limit, the fuse wire melts and breaks. __________
iii. An electromagnet does not attract a piece of iron. __________
iv. An electric bell has an electromagnet. _________
Q3. What is electric current?
Q4. Why does light bulb get hot?
Q5. Who discovered magnetic effect of current?
Q6. How does a bulb glow?
Q7. Write some uses of battery.
Q8. Which wire used in electric heater and why?
Q9. What is filament?
Q10. Is it possible for a wire to melt and break? Why?
Q11. What is the heating effect of the electric current?
Q12. Who invented electric bulb?
Q13. What are the uses of heating effect of electric current?
Q14. Explain the symbol of electric cell.
Q15. Name any two effects of electric current.
Q16. Why are fuse wires not used in circuit containing electric cell?
Q17. What is an electric circuit?