CBSE Class 10 Physics - Electricity (3)

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CBSE Class 10 Physics - Electricity (3)

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1. How do we express electric current?

2. What is an electric circuit?

3. What does a switch do?

4. Conventionally, in an electric circuit the direction of electric current is taken

as opposite to the direction of the flow of electrons, which are negative charges. Why?

5. What is the SI unit of electric charge? How many electrons make one coulomb of

charge?

6. Define the SI unit of current.

7. Which instrument is used to measure the current flowing in a circuit?

How is it connected in the circuit and why?

8. In which smaller units can we measure the small amount of current flowing in the

circuit?

9. How are the related to the SI unit of current?

10. What makes the electric charge to flow?

11. State the energy conversion taking place in

(a) Electric cell (b) Electric torch

12. Define the electric potential difference between two points in an electric

circuit carrying some current.

13. Define the SI unit of Electric potential.

14. Which instrument is used to measure the electric potential difference between

two points in a circuit? How is it connected in the circuit and why?

15. State the law relating the potential difference across a conductor and the

current through it?

16. The V–I graph is a straight line that passes through the origin of the graph.

What do you conclude from this observation?

17. Define resistance of a material. Define its SI unit.

18. Which component is used to regulate current without changing the voltage source

in an electric circuit?

19. Fill in the blanks

A component of a given size that offers a low resistance is a ________________.

A conductor having some appreciable resistance is called a ______________.

A component of identical size that offers a higher resistance is a

_____________________..

20. An _____________ of the same size offers even higher resistance.

21. Discuss the activity to show that resistance of a conductor depends on its length

and area of cross section.

22. What is the electrical resistivity of the material of the conductor? What is its SI unit?

23. Which common factor affects both resistance as well as resistivity and how?

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