Exercise- 10th Sci. 1, 4. Effects of electric current

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1. The frequency of AC is ..... Hz.

2. Write Fleming’s left hand rule.

3. The right hand thumb rule is called .......  ...  .... rule.

4.  220/ 1.5 =?

5. How do we decide that a given material is a good conductor of electricity or is an insulator?

6. If 1 kW power is used for 1 hour, it will mean .... of electrical energy is used.

7. The unit of electrical power is ..... .

8.  (220)² / 12 =?

9.  In  Hans Christian Oersted honour, the unit of intensity of the magnetic field is termed as ...... .

10. A device changing electrical energy into mechanical energy is known as electric ...... .

11. A tungsten wire is used in an electric bulb.

12. ...... showed that an electric current can be produced in a conductor with the help of a moving magnet.

13. A current changing in magnitude and direction after equal intervals of time which is called ........ .....  .

14. The magnetic field in a solenoid ...... .

15.  220/ 5 =?

16. ...... current flows in one direction,

17. Write long form of MCB.

18. Write Fleming’s right hand rule.

19.  A non oscillatory current flowing in one direction, in a circuit, from the cell to the cell. Such a current is called a ......  .....  .

20. Galvanometer, Voltmeter and Ammeter is a sensitive device which works on the same principle as that of an electric ....... .

21. The intensity of the magnetic field within the ..... is uniform everywhere.

22. Write Day-to day uses of electric motor.

23. 220 × 0.45 =?

24. Write use of the heating effect of electric current.

25. Draw figure of a solenoid coil.

26. √(400×9) =?

27. 1kWh =......  J.

28. Define solenoid.

29. The oscillation of the alternating current occurs in a sinusoidal manner with time and hence is shown by the symbol ....... .

30. Melting point of tungsten is nearly ..... °C.

31. Write  Right hand thumb Rule.

32. The ....... current can increase, can be stable, or can reduce also, but it is not oscillatory.

33. When 1 kWh electrical energy is used, it is termed as .... unit of energy.

35. The ‘live’ and the ‘neutral’ wires have potential difference of ..... V.

36. P = ..... / R.

37. .....  discovered the laws of electromagnetic induction.

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