Electricity & MagnetismElectricity & Magnetism

Chapter 19 and 20 Chapter 19 and 20

Review for TestReview for Test

April 19, 2005April 19, 2005

Question 1Question 1

What are the units for resistance?What are the units for resistance?

A. voltsA. voltsB. ohmsB. ohmsC. ampsC. ampsD. wattsD. wattsE. metersE. meters

Question 2Question 2

A circuit has 120 volts and a current A circuit has 120 volts and a current of 10 amps.of 10 amps.

What is the resistance?What is the resistance?

A. 1200 ohmsA. 1200 ohmsB. 0.083 ohmsB. 0.083 ohmsC. 1200 voltsC. 1200 voltsD. 12 ohmsD. 12 ohmsE. 12 ampsE. 12 amps

Question 3Question 3

In a schematic diagram, what does In a schematic diagram, what does this symbol represent?this symbol represent?

A. Power SourceA. Power SourceB. WireB. WireC. Light BulbC. Light BulbD. AmmeterD. AmmeterE. VoltmeterE. Voltmeter

Question 4Question 4

In a schematic diagram, this In a schematic diagram, this represents a power source. represents a power source.

Which side is the Which side is the positive terminal?positive terminal?

A. LeftA. LeftB. BottomB. BottomC. RightC. RightD. TopD. TopE. NoneE. None

Question 5Question 5

Describe a circuit that has a high Describe a circuit that has a high current and a low voltage in terms current and a low voltage in terms of electrons and energy.of electrons and energy.

A. Few electrons, high energyA. Few electrons, high energyB. Few electrons, low energyB. Few electrons, low energyC. Many electrons, high energyC. Many electrons, high energyD. 18 electrons, high energyD. 18 electrons, high energyE. Many electrons, low energyE. Many electrons, low energy

Question 6Question 6

What is the voltage in a circuit that What is the voltage in a circuit that has 10 amps of current and 5 ohms has 10 amps of current and 5 ohms of resistance?of resistance?

A. 10 voltsA. 10 voltsB. 50 ampsB. 50 ampsC. 2 voltsC. 2 voltsD. 50 voltsD. 50 voltsE. 15 voltsE. 15 volts

Question 7Question 7

The force of attraction between two The force of attraction between two charges gets smaller as the two charges gets smaller as the two charges move farther apart.charges move farther apart.

What law is this?What law is this?

A. Coulomb’s LawA. Coulomb’s LawB. Newton’s First LawB. Newton’s First LawC. Kinetic Theory of MatterC. Kinetic Theory of MatterD. Ohm’s LawD. Ohm’s LawE. Cole’s LawE. Cole’s Law

Question 8Question 8

What type of circuit has only one What type of circuit has only one path for electrons to flow?path for electrons to flow?

A. Alternating CurrentA. Alternating CurrentB. Open CircuitB. Open CircuitC. Series CircuitC. Series CircuitD. Parallel CircuitD. Parallel CircuitE. Combination CircuitE. Combination Circuit

Question 9Question 9

Which of the following materials is a Which of the following materials is a good conductor?good conductor?

A. WoodA. WoodB. PaperB. PaperC. GlassC. GlassD. CopperD. CopperE. PlasticE. Plastic

Question 10Question 10

A resistor slows down the flow of A resistor slows down the flow of electrons.electrons.

What does this create?What does this create?

A. BunniesA. BunniesB. HomeworkB. HomeworkC. MusicC. MusicD. AirD. AirE. HeatE. Heat

Question 11Question 11

Which two light Which two light bulbs are bulbs are connected in connected in series?series?

A. P and EA. P and EB. H and GB. H and GC. G and PC. G and PD. C and LD. C and LE. P and HE. P and H

Question 12Question 12

How many lights go How many lights go out when the out when the switch at J is switch at J is open?open?

A. 0 (none)A. 0 (none)B. 1B. 1C. 2C. 2D. 3D. 3E. 5 (all)E. 5 (all)

Question 13Question 13

Which way is Which way is electricity electricity moving?moving?

A. From B to DA. From B to DB. From I to FB. From I to FC. From N to KC. From N to KD. From D to BD. From D to BE. From K to IE. From K to I

Question 14Question 14

If Light G goes out, If Light G goes out, what happens?what happens?

A. E & H stay on, C & P go outA. E & H stay on, C & P go outB. All other lights stay onB. All other lights stay onC. H, C, and P stay on, E goes outC. H, C, and P stay on, E goes outD. All other lights go outD. All other lights go outE. E & H go out, C & P stay onE. E & H go out, C & P stay on

Question 15Question 15

Where can you put a Where can you put a switch that would switch that would control the whole control the whole circuit?circuit?

A. Between G and HA. Between G and HB. Between P and KB. Between P and KC. Between B and CC. Between B and CD. Between D and ED. Between D and EE. Switch J already does thisE. Switch J already does this

Question 16Question 16

What is “L”?What is “L”?

A. AmmeterA. AmmeterB. ResistorB. ResistorC. Light BulbC. Light BulbD. Power SourceD. Power SourceE. VoltmeterE. Voltmeter

Question 17Question 17

Which light should Which light should be the brightest?be the brightest?

A. GA. GB. BB. BC. HC. HD. PD. PE. EE. E

Question 18Question 18

If Light P was replaced If Light P was replaced with a voltmeter, with a voltmeter, would it work would it work properly? Why?properly? Why?

A. Yes, because it’s in parallelA. Yes, because it’s in parallelB. Yes, because it’s in seriesB. Yes, because it’s in seriesC. No, because it’s in parallelC. No, because it’s in parallelD. No, because it’s in seriesD. No, because it’s in seriesE. It depends on the batteryE. It depends on the battery

Question 19Question 19

If Light C was replaced If Light C was replaced with an ammeter, with an ammeter, would it work would it work properly? Why?properly? Why?

A. Yes, because it’s in parallelA. Yes, because it’s in parallelB. Yes, because it’s in seriesB. Yes, because it’s in seriesC. No, because it’s in parallelC. No, because it’s in parallelD. No, because it’s in seriesD. No, because it’s in seriesE. It depends on the batteryE. It depends on the battery

Question 20Question 20

If each bulb has 10 If each bulb has 10 ohms of resistance, ohms of resistance, what is the total what is the total resistance from resistance from D D F F I I K ? K ?

A. 10 ohmsA. 10 ohmsB. 20 ohmsB. 20 ohmsC. 30 ohmsC. 30 ohmsD. 40 ohmsD. 40 ohmsE. 50 ohmsE. 50 ohms

Question 21Question 21

How much current is passing through How much current is passing through a radio carrying 120 volts with a a radio carrying 120 volts with a resistance of 240 ohms?resistance of 240 ohms?

A. 0.5 ampsA. 0.5 ampsB. 1 ampB. 1 ampC. 2 ampsC. 2 ampsD. 10 ampsD. 10 ampsE. 28 800 ampsE. 28 800 amps

Question 22Question 22

A circuit is carrying 9 amps of current A circuit is carrying 9 amps of current and has 10 deciohms of resistance. and has 10 deciohms of resistance.

What is the voltage in the circuit?What is the voltage in the circuit?

A. 90 ampsA. 90 ampsB. 9 ampsB. 9 ampsC. 0.9 voltsC. 0.9 voltsD. 9 voltsD. 9 voltsE. 90 voltsE. 90 volts

Question 23Question 23

Which of the following is a property of Which of the following is a property of matter?matter?

A. MagnetismA. MagnetismB. Electrical PowerB. Electrical PowerC. AmpC. AmpD. CompassD. CompassE. Parallel CircuitE. Parallel Circuit

Question 24Question 24

Which device converts electrical Which device converts electrical energy into mechanical energy?energy into mechanical energy?

A. Static ElectricityA. Static ElectricityB. Electric MotorB. Electric MotorC. SuperconductorC. SuperconductorD. GeneratorD. GeneratorE. MaglevE. Maglev

Question 25Question 25

Which device changes the amount of Which device changes the amount of voltage in a circuit?voltage in a circuit?

A. CompassA. CompassB. Electric MotorB. Electric MotorC. SuperconductorC. SuperconductorD. GeneratorD. GeneratorE. TransformerE. Transformer

Question 26Question 26

Which device aligns with the Earth’s Which device aligns with the Earth’s magnetic field?magnetic field?

A. CompassA. CompassB. Electric MotorB. Electric MotorC. SuperconductorC. SuperconductorD. GeneratorD. GeneratorE. TransformerE. Transformer

Question 27Question 27

An atom becomes positively charged An atom becomes positively charged when it ____________when it ____________

A. Gains ProtonsA. Gains ProtonsB. Loses ProtonsB. Loses ProtonsC. Gains ElectronsC. Gains ElectronsD. Loses ElectronsD. Loses ElectronsE. Loses NeutronsE. Loses Neutrons

Question 28Question 28

Which of the following wires would Which of the following wires would have the least resistance?have the least resistance?

A. Short and ThinA. Short and ThinB. Long and ThinB. Long and ThinC. Short and ThickC. Short and ThickD. Long and ThickD. Long and ThickE. Red and BlueE. Red and Blue

Question 29Question 29

How do you create static electricity?How do you create static electricity?

A. Rub two conductors togetherA. Rub two conductors togetherB. Rub two insulators togetherB. Rub two insulators togetherC. Attach a battery to a circuitC. Attach a battery to a circuitD. Plug it inD. Plug it inE. Rub an insulator on a conductorE. Rub an insulator on a conductor

Question 30Question 30

What is Ohm’s Law?What is Ohm’s Law?

A. A. When the bell rings and you go “ohm”.When the bell rings and you go “ohm”.

B. F = m x a B. F = m x a C. v = λ x fC. v = λ x fD. D = m / VD. D = m / VE. V = I x R E. V = I x R