Name: ________________________ Class: ___________________ Date: __________ ID: A

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Science 9 Review

Modified True/FalseIndicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true.

____ 1. Conductors allow electric charges to move easily through them.

____ 2. Like charges attract each other and opposite charges repel each other.

____ 3. You can ground a charged object by connecting it to Earth with a conductor.

____ 4. The amount of charge passing a point in a conductor per unit of time is measured in coulombs.

Use the circuit diagram to answer the next question.

____ 5. In the circuit diagram, C represents the source for the electrical circuit.

____ 6. In the symbol for a cell, the shorter line symbolizes the negative terminal.

____ 7. Static electricity is more useful as an energy source than current electricity.

____ 8. As more resistors are added to a parallel circuit, the total resistance of the circuit increases.

____ 9. A 1400 W electric baseboard heater consumes more energy per minute than does a 1000 W kettle.

____ 10. The unit kW•h is a measure of energy consumption.

____ 11. In a parallel circuit, the potential difference across each load is equal.

____ 12. In a series circuit, the sum of the current through each resistor is equal to the total current through the circuit.

Name: ________________________ ID: A

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Multiple ChoiceIdentify the choice that best completes the statement or answers the question.

____ 13. What charge will a material take on if it gains electrons?a. negativeb. neutralc. no charged. positive

____ 14. A metal sphere is charged by touching it with a charged rod. Which charging process was used?a. conductionb. frictionc. inductiond. insulation

____ 15. What are materials that prevent charges from moving freely called?a. balancedb. conductorsc. insulatorsd. unbalanced

____ 16. Which surface will a balloon that is rubbed against your head most likely stick to?a. a metal wallb. a wooden wallc. neither a metal wall nor a wooden walld. a metal wall and a wooden wall

The diagram illustrates the charge on three different objects, A, B, and C. Use the diagram to answer the next question.

____ 17. Which describes object A?a. conductorb. negatively chargedc. neutrald. positively charged

____ 18. Which describes object B?a. insulatorb. negatively chargedc. neutrald. positively charged

Name: ________________________ ID: A

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____ 19. Which statement below is true?

a. Object A will attract object B.b. Object A will attract object C.c. Object B will repel object A.d. Object B will repel object C.

____ 20. Why are electrical wires usually constructed of metals?a. Metals are commonly found in long, thin forms.b. Metals are often shiny and malleable.c. Metals do not provide an easy path through which electrons can travel.d. Metals have many loosely held electrons.

____ 21. What are the two kinds of electric charges?a. electron and neutronb. negative and protonc. neutral and chargedd. positive and negative

Use the diagram to answer the next question.

____ 22. What is the best way to measure the current through the circuit?a. an ammeter connected to the positive and negative terminals of the batteryb. an ammeter inserted between the battery and the switchc. a voltmeter connected to the positive and negative terminals of the batteryd. a voltmeter inserted between the battery and the switch

Name: ________________________ ID: A

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____ 23. In order for current to flow around the circuit, which condition must be satisfied?a. An ammeter must be placed in the circuit.b. Both wires must be connected to the positive terminal of the battery.c. The switch must be in the closed position.d. The switch must be removed from the circuit.

____ 24. What is the unit of measurement for electric current?a. ampereb. chargec. electrond. volt

____ 25. What is the common name for potential difference?a. amperesb. currentc. joulesd. voltage

____ 26. Which statement best describes Ohm’s law?a. Current equals charge divided by time.b. Potential difference equals energy divided by charge.c. Resistance equals current divided by potential difference.d. Resistance equals potential difference divided by current.

____ 27. When the switch is opened, what happens to the electrons in the circuit?

a. More are added.b. Some are removed.c. They begin to move.d. They stop moving.

____ 28. Which feature of an electric circuit describes what slows down the flow of electrons?a. currentb. potential differencec. resistanced. voltage

Name: ________________________ ID: A

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____ 29. What is the current through the circuit shown?

a. 0.67 Ab. 1.5 Ac. 3.0 Ad. 72 A

____ 30. What is the effect of doubling the resistance of the lamp in the circuit shown without changing the voltage of the battery?

a. The current is doubled.b. The current is halved.c. The current is quadrupled.d. The current is unchanged.

____ 31. In a standard flashlight battery, from which terminal do the electrons leave?a. negative terminalb. neutral terminalc. positive terminald. voltage terminal

Name: ________________________ ID: A

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____ 32. Three identical resistors are connected in series to a 6 V power supply. An ammeter is used to determine the total current (I) through the 6 V power supply circuit. Which equation will give the resistance of the second resistor?a. Resistance = 6 V Ib. Resistance = 6 V Ic. Resistance = 6 V 3Id. Resistance = 6 V 3I

Use the diagram to answer the next question.

____ 33. A second identical bulb is added to the circuit by connecting it from point B to point C. Which statement is true?a. The new bulb is brighter than the original lamp.b. The original bulb is brighter than the new lamp.c. The two bulbs are of equal brightness, and are as bright as the single bulb was.d. The two bulbs are of equal brightness, but are dimmer than the single bulb was.

____ 34. If a family receives an electric bill of $122.00 for a month, and the power company charges 10 cents per kW•h of energy, how much energy did the family use?a. 122 kW•hb. 1220 kW•hc. 12 200 kW•hd. 122 000 kW•h

____ 35. A home theatre requires 10 A to operate. What is the power of the theatre when it is connected to a 120 V household circuit?a. 12 Wb. 83 Wc. 1200 Wd. 8300 W

Name: ________________________ ID: A

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____ 36. How much does it cost to run a 2 kW freezer for 24 h if the cost of energy is 10 cents per kilowatt-hour?a. $0.48b. $1.20c. $2.40d. $4.80

____ 37. A 240 W laptop computer requires 10 A to operate. What is the voltage produced by the computer’s battery pack?a. 12 Vb. 24 Vc. 2400 Vd. 1200 V

____ 38. If a clothes dryer consumes 435 W of power in 3 min, how much energy has been used by this appliance?a. 1305 Jb. 78 300 Jc. 216 000 Jd. 783 000 J

____ 39. Why are scientists and engineers developing electrical energy alternatives such as wind, solar, and fuel cells?a. Electrical energy alternatives are less efficient.b. Electrical energy generation should minimize any damage to the environment.c. The cost of fossil fuels is decreasing.d. The supplies of non-renewable energy sources are unlimited.

____ 40. In Canada, why is solar energy used to produce only small amounts of electricity?a. A lot of sunlight is available.b. Solar cells are expensive.c. Solar cells are very efficient.d. Solar cells damage the environment.

Matching

Match each description with the correct term.a. the unit of electric charge d. glass, plastics, and dry wood are

examplesb. an equal number of positive charges and

negative chargese. copper and aluminum are examples

c. a type of plastic f. a machine that can be used to create a static charge

____ 41. conductors

____ 42. neutral

____ 43. coulomb

____ 44. insulators

____ 45. acetate

Name: ________________________ ID: A

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Match each term with the correct description.a. electron d. nucleusb. proton e. atomc. neutron

____ 46. has a positive charge

____ 47. has a negative charge

____ 48. contains neutrons and protons

____ 49. has no electric charge

____ 50. a small particle of matter

Match each diagram with the correct circuit component.

a. d.

b. e.

c. f.

____ 51. bulb

____ 52. conducting wire

____ 53. open switch

____ 54. battery

____ 55. closed switch

____ 56. cell

Short Answer

57. Explain the purpose of a lightning rod.

Name: ________________________ ID: A

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Use the illustration to answer the next question.

58. Which law of static charge is not represented in the illustration?

59. List three devices that use the properties of static electricity. Briefly describe what each device is used for.

60. In order for a light bulb to work properly, how must its resistance compare to the resistance of the wire? Explain.

61. Will the bulb in the circuit glow? If not, explain why.

62. A set of LED lights plugs into a 110 V supply. If the current through the lights is 0.05 A, what is the resistance of the set of lights?

63. An electric motor has a resistance of 200 . It is connected to a power source that has a potential difference of 120 V. Calculate the current that flows through the motor. Show your work.

64. What is the relationship between the resistance and the power rating of an electrical device connected to a

constant potential difference? (Hint: Use the equations P = IV and to answer the question.)

ID: A

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Science 9 ReviewAnswer Section

MODIFIED TRUE/FALSE

1. ANS: T PTS: 1 TOP: Static ElectricityKEY: conductors MSC: Level 1

2. ANS: FLike charges repel each other and opposite charges attract each other.

PTS: 1 TOP: Static Electricity KEY: laws of static chargeMSC: Level 1

3. ANS: T PTS: 1 TOP: Static ElectricityKEY: grounding MSC: Level 1

4. ANS: FThe amount of charge passing a point in a conductor per unit of time is measured in amperes.

PTS: 1 TOP: Current Electricity KEY: amperesMSC: Level 1

5. ANS: T PTS: 1 TOP: Current ElectricityKEY: source | circuit components MSC: Level 1

6. ANS: T PTS: 1 TOP: Current ElectricityKEY: circuit diagrams MSC: Level 1

7. ANS: FStatic electricity is less useful as an energy source than current electricity.

PTS: 1 TOP: Current Electricity KEY: static electricityMSC: Level 1

8. ANS: FAs more resistors are added to a parallel circuit, the total resistance of the circuit decreases.

PTS: 1 TOP: Resistance KEY: parallel circuits MSC: Level 1

9. ANS: T PTS: 1 TOP: Power and EnergyKEY: power ratings MSC: Level 1

10. ANS: T PTS: 1 TOP: Power and EnergyKEY: kilowatt-hour MSC: Level 1

11. ANS: T PTS: 1 TOP: ResistanceKEY: parallel circuits | voltage MSC: Level 1

12. ANS: FIn a series circuit, the current through any one resistor is equal to the total current through the circuit.

PTS: 1 TOP: Resistance KEY: current | series circuit MSC: Level 1

ID: A

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MULTIPLE CHOICE

13. ANS: A PTS: 1 TOP: Static Electricity KEY: electrons | negative charge MSC: Level 1

14. ANS: A PTS: 1 TOP: Static Electricity KEY: charging by conduction | charging process MSC: Level 1

15. ANS: C PTS: 1 TOP: Static Electricity KEY: insulators MSC: Level 1

16. ANS: B PTS: 1 TOP: Static Electricity KEY: attraction of neutral objects MSC: Level 2

17. ANS: C PTS: 1 TOP: Static Electricity KEY: charge transfer | electron transfer MSC: Level 2

18. ANS: D PTS: 1 TOP: Static Electricity KEY: charge transfer | electron transfer MSC: Level 2

19. ANS: A PTS: 1 TOP: Static Electricity KEY: laws of static charge MSC: Level 2

20. ANS: D PTS: 1 TOP: Static Electricity KEY: conductors MSC: Level 3

21. ANS: D PTS: 1 TOP: Static Electricity KEY: negative charge | positive charge MSC: Level 1

22. ANS: B PTS: 1 TOP: Current Electricity KEY: ammeter MSC: Level 2

23. ANS: C PTS: 1 TOP: Current Electricity KEY: circuit components MSC: Level 1

24. ANS: A PTS: 1 TOP: Current Electricity KEY: amperes MSC: Level 1

25. ANS: D PTS: 1 TOP: Current Electricity KEY: potential difference | voltage MSC: Level 1

26. ANS: D PTS: 1 TOP: Resistance KEY: Ohm’s LawMSC: Level 1

27. ANS: D PTS: 1 TOP: Current Electricity KEY: current MSC: Level 2

28. ANS: C PTS: 1 TOP: Resistance KEY: resistanceMSC: Level 1

29. ANS: B PTS: 1 TOP: Resistance KEY: Ohm’s LawMSC: Level 2

30. ANS: B PTS: 1 TOP: Resistance KEY: Ohm’s LawMSC: Level 3

31. ANS: A PTS: 1 TOP: Current Electricity KEY: battery | negative terminal MSC: Level 1

32. ANS: C PTS: 1 TOP: Resistance KEY: resistors in seriesMSC: Level 3

33. ANS: C PTS: 1 TOP: Resistance KEY: parallel circuitsMSC: Level 3

34. ANS: B PTS: 1 TOP: Power and Energy KEY: cost of energy MSC: Level 2

ID: A

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35. ANS: C PTS: 1 TOP: Power and Energy KEY: power MSC: Level 2

36. ANS: D PTS: 1 TOP: Power and Energy KEY: paying for electricity MSC: Level 2

37. ANS: B PTS: 1 TOP: Power and Energy KEY: electrical power | voltage MSC: Level 2

38. ANS: B PTS: 1 TOP: Power and Energy KEY: calculating energy consumption MSC: Level 2

39. ANS: B PTS: 1 TOP: Alternate Sources of EnergyKEY: energy alternatives MSC: Level 1

40. ANS: B PTS: 1 TOP: Alternate Sources of EnergyKEY: solar energy MSC: Level 1

MATCHING

41. ANS: E PTS: 1 TOP: Static Electricity KEY: conductors MSC: Level 1

42. ANS: B PTS: 1 TOP: Static Electricity KEY: neutral MSC: Level 1

43. ANS: A PTS: 1 TOP: Static Electricity KEY: coulomb MSC: Level 1

44. ANS: D PTS: 1 TOP: Static Electricity KEY: insulators MSC: Level 1

45. ANS: C PTS: 1 TOP: Static Electricity KEY: acetate MSC: Level 1

46. ANS: B PTS: 1 TOP: Static Electricity KEY: protons MSC: Level 1

47. ANS: A PTS: 1 TOP: Static Electricity KEY: electrons MSC: Level 1

48. ANS: D PTS: 1 TOP: Static Electricity KEY: nucleus MSC: Level 1

49. ANS: C PTS: 1 TOP: Static Electricity KEY: neutrons MSC: Level 1

50. ANS: E PTS: 1 TOP: Static Electricity KEY: atoms MSC: Level 1

51. ANS: D PTS: 1 TOP: Current Electricity KEY: circuit components | bulbs MSC: Level 1

52. ANS: F PTS: 1 TOP: Current Electricity KEY: circuit components | conducting wire MSC: Level 1

53. ANS: A PTS: 1 TOP: Current Electricity KEY: circuit components | open switch MSC: Level 1

54. ANS: B PTS: 1 TOP: Current Electricity KEY: circuit components | battery MSC: Level 1

55. ANS: C PTS: 1 TOP: Current Electricity KEY: circuit components | closed switch MSC: Level 1

ID: A

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56. ANS: E PTS: 1 TOP: Current Electricity KEY: circuit components | cell MSC: Level 1

SHORT ANSWER

57. ANS: If lightning occurs, the large amount of charge will pass through the lightning rod to the ground therefore protecting the building.

PTS: 1 TOP: Static Electricity KEY: groundingMSC: Level 1

58. ANS: Neutral objects are attracted to charged objects.

PTS: 2 TOP: Static Electricity KEY: laws of static chargeMSC: Level 3

59. ANS: Any three (3) devices including the following:- Air ionizer: is used to freshen air inside homes- Paint sprayer: is used to ensure a smooth, even coat of paint on automobiles and other metal machinery parts.- Photocopier: uses the electrostatic properties of a metal called selenium to make copies of documents- Lightning rod: uses a metal conducting wire and a pointed metal tip to conduct lightning discharges to the ground

PTS: 6 TOP: Static Electricity KEY: applications of static electricity | ionizers | lightning rod | paint | photocopierMSC: Level 1

60. ANS: The resistance in the light bulb’s filament must be far greater than in the conducting wire. This causes the electrons’ electrical energy to be converted into heat and light energy. The wire has very little resistance, and therefore the electrons travelling through the wire lose almost no electrical energy.

PTS: 2 TOP: Resistance KEY: energy conversions | resistanceMSC: Level 2

61. ANS: No. The bulb will not glow. Both wires are connected to the positive terminal of the cell. One wire must be removed from this terminal and connected to the negative terminal.

PTS: 2 TOP: Current Electricity KEY: circuit componentsMSC: Level 1

ID: A

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62. ANS:

The resistance is .

PTS: 3 TOP: Resistance KEY: Ohm’s Law MSC: Level 2 63. ANS:

The current that flows through the motor is 0.6 A.

PTS: 3 TOP: Resistance KEY: Ohm’s Law MSC: Level 2 64. ANS:

Power is the product of current and voltage. Given a constant voltage, power increases only with an increase in current. Current is voltage divided by resistance. Given a constant voltage, current increases only with a reduction in resistance. Therefore, the power of a device increases with a decrease in its resistance. That is, a high-power device is one with a low resistance.

PTS: 3 TOP: Power and Energy KEY: power loss | resistanceMSC: Level 3

ID: A Science 9 Review [Answer Strip]

_____ 1.T

_____ 2.F

_____ 3.T

_____ 4.F

_____ 5.T

_____ 6.T

_____ 7.F

_____ 8.F

_____ 9.T

_____ 10.T

_____ 11.T

_____ 12.F

_____ 13.A

_____ 14.A

_____ 15.C

_____ 16.B

_____ 17.C

_____ 18.D

_____ 19.A

_____ 20.D

_____ 21.D

_____ 22.B

_____ 23.C

_____ 24.A

_____ 25.D

_____ 26.D

_____ 27.D

_____ 28.C

_____ 29.B

_____ 30.B

_____ 31.A

ID: A Science 9 Review [Answer Strip]

_____ 32.C

_____ 33.C

_____ 34.B

_____ 35.C

_____ 36.D

_____ 37.B

_____ 38.B

_____ 39.B

_____ 40.B

_____ 41.E

_____ 42.B

_____ 43.A

_____ 44.D

_____ 45.C

_____ 46.B

_____ 47.A

_____ 48.D

_____ 49.C

_____ 50.E

_____ 51.D

_____ 52.F

_____ 53.A

_____ 54.B

_____ 55.C

_____ 56.E