1. SNC 1DI Electricity Review

2. Fill in the Blank

3. Charging by __________ causes electrons in a neutral object to move.

4. Charging by friction causes electrons in a neutral object to move.

5. A(n) __________ is a material that prevents the flow of current.

6. A(n) insulator is a material that prevents the flow of current.

7. In a series circuit, a light bulb is referred to as the ________.

8. In a series circuit, a light bulb is referred to as the load.

9. The opposite of static electricity is ____________.

10. The opposite of static electricity is current electricity.

11. The name of the instrument used to measure static electricity is a(n) ___________________.

12. The name of the instrument used to measure static electricity is a(n) electroscope.

13. Lightning is created by ______________________.

14. Lightning is created by induced charge separation.

15. Charged objects attract neutral objects, opposite charges attract, and same charges repel are the three postulates of the ____________________.

16. Charged objects attract neutral objects, opposite charges attract, and same charges repel are the three postulates of the law of electrical charges.

17. To measure the amount of electrons moving past a point in a circuit you would need to use a(n) ____________.

18. To measure the amount of electrons moving past a point in a circuit you would need to use a(n) ammeter.

19. Potential difference is measured using a(n) _____________ in units of ________________.

20. Potential difference is measured using a(n) voltmeter in units of Volts.

21. Connecting wire, a load, an energy source and a(n) _____________ are the four components of a circuit.

22. Connecting wire, a load, an energy source and a(n) switch are the four components of a circuit.

23. True or False

24. Tap water is a good insulator of electricity because it contains dissolved salts and charged particles.

25. False

26. In charging by induction, electrons are transferred between the objects.

27. False

28. Static electricity refers to the movement of electrons in a closed path.

29. False

30. When the thickness of a wire increases, the resistance of the wire decreases.

31. True

32. An ammeter must be connected in parallel with a circuit to take accurate readings.

33. False

34. The wires in the heating element of a hair dryer have relatively high resistance.

35. True

36. Similarities/Differences - describe similarities/differences between each pair

37. static electricity, current electricity

38. -Both involve electrons -Static electricity is an imbalance of charge at rest -Current electricity is the movement of electrons in a circuit

39. insulator, conductor

40. -Both are used to affect the flow of electrons -Insulators restrict the flow of electrons -Conductors allow the flow of electrons

41. series circuit, parallel circuit

42. -both are pathways that involve the flow of electrons -series circuit has only one path for electrons -parallel circuit has 2 or more paths for the flow of electrons

43. ammeter, voltmeter

44. -Both are used to measure electron in a circuit -Ammeter measures current in Amperes -Voltmeter measures potential difference in Volts

45. charging by contact, induction

46. -both are methods to charge objects -in contact the object is touched by a charged object -in induction the object is not touched by a charged object

47. lightning, grounding

48. -both are attempts to neutralize -in lightning, electrons strike the ground in order to neutralize the ground -when any object is grounded, extra electrons are either pulled from the ground or pushed to the ground to neutralize the object

49. Multiple choice

50. Which of the following materials would make the best insulator? a) pure water b) wooden peg c) iron nail d) copper wire

51. Which of the following materials would make the best insulator? a) pure water b) wooden peg c) iron nail d) copper wire

52. Which of the following is an example of charging by induction? a) static cling on clothes b) attracting paper with a charged rod c) rubbing a balloon on a sweater d) charging an electroscope by touching it

53. Which of the following is an example of charging by induction? a) static cling on clothes b) attracting paper with a charged rod c) rubbing a balloon on a sweater d) charging an electroscope by touching it

54. Neutral objects can become charged by a)gaining or losing neutrons b)gaining or losing protons c) gaining or losing electrons d) gaining or losing protons, neutrons, or electrons

55. Neutral objects can become charged by a)gaining or losing neutrons b)gaining or losing protons c) gaining or losing electrons d) gaining or losing protons, neutrons, or electrons

56. Which factor best explains why lightning strikes the ground? a)metals conduct the current electricity to the ground b)friction between the cloud and the ground c) electrostatic discharge between cloud and Earth d) charging by friction and direct contact

57. Which factor best explains why lightning strikes the ground? a)metals conduct the current electricity to the ground b)friction between the cloud and the ground c) electrostatic discharge between cloud and Earth d) charging by friction and direct contact

58. Which of the following refers to the path along which electrons can flow? a) circuit b) current c) potential difference d) resistance

59. Which of the following refers to the path along which electrons can flow? a) circuit b) current c) potential difference d) resistance

60. Which device is used to measure the potential difference across a load? a) ammeter b) ohmmeter c) voltmeter d) circuit breaker

61. Which device is used to measure the potential difference across a load? a) ammeter b) ohmmeter c) voltmeter d) circuit breaker

62. Which of the following units is used to measure current? a) amperes b) volts c) watts d) joules

63. Which of the following units is used to measure current? a) amperes b) volts c) watts d) joules

64. Diagrams

65. With use of a diagram, draw and explain how you can create an induced charge in a neutral electroscope by using a piece of fur and ebonite rod. BEFORE DURING AFTER

66. With use of a diagram, draw and explain how you can create an induced charge in a neutral electroscope by using a piece of fur and ebonite rod.

67. With use of a diagram, draw and explain how you can create a permanent charge in a neutral electroscope by using a piece of fur and ebonite rod. BEFORE DURING AFTER

68. With use of a diagram, draw and explain how you can create a permanent charge in a neutral electroscope by using a piece of fur and ebonite rod.

69. With use of a diagram, draw and explain how an induced separation charge forms and how a lightning bolt occurs.

71. With use of a diagram, draw a series circuit that has 4, 1.5 V cells, 3 light bulbs, 1 ammeter between light 2 and 3, 1 voltmeter across light three and one switch.

73. With use of a diagram, draw a circuit that has 1, 1.5 V cell, 3 light bulbs and 1 motor in parallel, each with a switch that controls each item and a voltmeter that measures the potential difference of the motor.

75. Calculations Show FULL solutions!

76. A current of 0.50 A flows through a light bulb, when a potential difference of 120 V is placed across the light bulb. What is the resistance of the light bulb?

77. Given I = 0.5 AR= V V = 120 V I Want= 120V R = ? 0.5 A = 240 Ω

78. A colour television has a resistance of 80 Ω. How much current passes through the television when it is plugged in to a 120 V wall socket?

79. Given R = 80 ΩI = V V = 120 V R Want = 120 V I = ? 80Ω = 1.5 A

80. A toaster connected to a 110 V power source has 6.0 A of current flowing through it. How much power is dissipated as heat?

81. Given V = 110 VP = V x I I = 6.0 A = 110 V x 6.0 A Want = 660 W P = ?

82. How much energy does the motor of a 615 W refrigerator use in one day, if it runs for 14 hours a day?

83. Given t = 14 hours x 60 min/hour x 60 s/min = 50 400 s P = 615 W Want E = ? E = P x t = 615 W x 50400 s = 30 996 000 J

84. That’s it!! Good Luck!!