X PHYSICS
UNIT – IX
CURRENT ELECTRICITY
1. The Unit of electric current is ____________.
2. Potential difference is measured in ____________.
3. ____________ is used to measure the potential difference.
4. The instrument used for measuring current is ____________.
5. Tap-Key is used to ____________ and ____________ an electric circuit.
6. The study of electric charges at rest is called ____________.
7. The flow of charges in a conductor constitutes an ____________ in it.
8. The direction of flow of ________ is taken as the direction of conventional current.
9. Free electrons are available in ____________.
10. Unit of power is ____________.
11. The P.D. of an electrical device or energy source is called its ____________.
12. Battery or cell is the seat of ____________.
13. E.m.f. is nothing but work done per unit ____________ charge.
14. A simple electric circuit consists of a source of ____________ a device which utilizes it and conducting wires to connect them.
15. Three dry cells each of e.m.f 2 volts are connected in parallel. Resultant voltage is ____________.
16. The unit of conductivity is _____________.
17. The electrical property of a conductor which opposes the flow of electrons through it is called _______.
18. ____________ are good conductors of electricity.
19. Reciprocal of the resistance is called ____________.
20. The unit of resistance is ____________.
21. The symbol for unit of resistance is ____________.
22. ____________ is used to regulate the value of a current in a circuit.
23. The conductors which obey Ohm’s law are called ____________ conductors.
24. The specimen of a conductor is called ______________.
25. Metallic nature is due to availability of ____________ electrons
26. The resistance of an ohmic conductor like a metallic alloy is ____________.
27. Resistance opposes the flow of ____________.
28. Current prefers a path of least ____________ in the current.
29. In a conductor, the flow of current is flow of free ____________.
30. If V = 1 volt and I = 1 ampere then R = ____________.
31. When resistances are connected in __________ the total voltage is divided among them. 32. The unit of resistance is volt per ____________.
33. The conversion of an A.C into D.C can be achieved by _____________.
34. High resistances are measured in ____________.
35. 1 kilo ohm is ____________.
36. 1 Mega ohm is ____________.
37. In a conductor if resistance increases, current ____________.
38. In a conductor as potential difference increases current ____________.
39. The vessel which contains an electrolyte and allows electrolysis to take place is called _____.
40. The conductors which does not obey Ohm’s law are called ____________ .
41. Examples for ohmic conductors are ____________.
42. According to ______ law, the amount of work done is directly proportional to heat produced.
43. The mass of ions liberated from an electrolyte is directly proportional to ______ and ______.
44. The unit of specific resistance is ____________.
45. A wire of uniform cross section is drawn until the length is doubled. The resistance becomes ____________.
46. Resistance of a conductor is directly proportional to its ____________.
47. Resistance of a conductor is inversely proportional to its ____________.
48. The reciprocal of resistivity is called ____________.
49. The resistance of metals increases with rise in ____________.
50. Impurities have a marked effect on the resistance of ____________.
51. Electrochemical equivalent of copper is _____________.
52. In a circuit, resistors connected end to end are said to be in ____________.
53. Three dry cells each of e.m.f 2 volts are connected in parallel. The equivalent e.m.f is _______.
54. If the two resistors of 100 ohms and 1 ohm are connected in parallel, the equivalent resistance is ____________.
55. When electric current passes through resistance, ____________ is produced.
56. The relation of i2, R and t in Joules law is ____________.
57. Electrical energy W = ____________.
58. Electric power (P) = Voltage × ____________.
59. 1 Megawatt = ____________.
60. The electrical work (W) done by a cell is given by ____________.
X PHYSICS
UNIT – IX
CURRENT ELECTRICITY ( Key )
(1) amperes (2) volts (3) voltmeter (4) ammeter (5) make, break (6) static electricity (7) electric current (8) positive charge (9) metals (10) watt or joule./ Sec (11) voltage (12) e.m.f (13) positive (14) electrical energy (15) 2V (16) Mhos per metre (17) Electric resistance (18) Metals (19) conductance (20) Ohm (21) Omega (O) (22) Rheostat (23) Ohmic (24) resistor (25) free (26) manganin (27) electrons (28) resistance (29) electrons (30) 1 volt/ampere. (31) series (32) ampere (33) a rectifier circuit (34) Kilo ohms (35) 103 O (36) 106 O (37) decreases (38) increases (39) Voltmeter or Electrolytic cell (40) non-ohmic conductors (41) metallic conductors (42) Joules (43) strength of the current, time (44) ohm-meter (45) four times (46) length (R?l) (47) area of cross section (R? 1/A) (48) conductivity (49) temperature (50) semiconductors (51) gm/coulomb (52) Series (53) 2 Volts (54) 0.99 ohms (55) heat (56) Q = i2. R.t (57) VQ (58) current (59) 106 watts (60) W = Vq.
