Deck 5: Fundamentals of Electricity

Question 1

As the electrons of an atom orbit it nucleus,what prevents them from colliding?

A) They are moving at the speed of light
B) They have like charges,so they repel each other
C) They never leave their orbits
D) They are too small to hit anything

Answer 1

B

Question 2

Technician A says that all electrons are alike regardless of the atomic element? Technician B says that all protons are alike regardless of the atomic element? Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Answer 2

C

Question 3

Which of the following substances would have the least ability to conduct electricity?

A) Gold
B) Copper
C) Aluminum
D) Rubber

Answer 3

D

Question 4

What determines the chemical properties of the elements?

A) How the shells are populated with electrons
B) The total number of electrons
C) The number of electrons in the valence shell
D) None of the above

Question 5

What are the factors that determine the electrical resistance of a length of copper wire?

A) Overall length of the wire
B) Temperature of the wire
C) Sectional area of the wire
D) All of the above

Question 6

Which theory of electrical current flow states that current flows from a negative location to a positive location in an electrical circuit?

A) Kilowatt's law
B) Electron theory
C) Conventional theory
D) Ohm's law

Question 7

Vehicle wiring schematics use which theory of current flow almost exclusively?

A) Conventional theory
B) Electron theory
C) Gilbert theory
D) Faraday theory

Question 8

Which of these wire gauge sizes has the largest diameter?

A) 18 gauge
B) 16 gauge
C) 12 gauge
D) 8 gauge

Question 9

Which of these terms mean the same thing as Voltage?

A) Charge differential
B) Electromotive force
C) Potential difference
D) All of the above

Question 10

The conventional theory of electrical current flow states that current flows:

A) From positive to negative
B) From negative to positive
C) From low potential to high potential

Question 11

An element's atomic number is used to identify the differences between specific elements.What determines the atomic number of an element?

A) Number of protons in the nucleus
B) Number of electrons
C) Sum of the neutrons and protons
D) None of the above

Question 12

Which of the following is true of an electron?

A) It has a positive charge
B) It has a negative charge
C) It is part of the nucleus of an atom
D) It has more mass than a proton

Question 13

What type of signal is produced by an inductive pulse generator?

A) Saw-tooth
B) Square-wave
C) AC Sinewave
D) Rippled DC

Question 14

What is an ion?

A) An electrically unbalanced element
B) An element that has a surplus or deficit of electrons
C) Both A and B
D) Neither A nor B

Question 15

How should an Ohmmeter be connected into an electrical circuit?

A) In series with the circuit energized
B) In parallel with the circuit energized
C) In series with the circuit open
D) In parallel with the circuit open

Question 16

All of these descriptions describing the behavior of magnetic lines of flux are true EXCEPT for:

A) Flux lines flow in one direction
B) Flux density is greatest at the poles of a magnet
C) Flux lines facing the same direction repel
D) Flux density determines the magnetic force

Question 17

Which of the following statements best describes the properties of an inert element?

A) Unlikely to participate in a chemical reaction
B) Have a fully populated valence shell
C) Both A and B
D) Neither A nor B

Question 18

When two or more atoms are chemically bonded,what is formed?

A) A molecule
B) A neutron
C) A proton
D) An ion

Question 19

What is the term used to describe an element with fewer than 4 electrons in its outer shell?

A) Insulator
B) Conductor
C) Semiconductor
D) Could be any of the above

Question 20

How many electrons are in the outer shell of a semiconductor?

A) 2
B) 4
C) 8
D) 16

Question 21

An electrical component that can store a charge differential is known as a:

A) Capacitor
B) Inductor
C) Transformer
D) Relay

Question 22

Which of the following components uses a step-up transformer?

A) Ignition coil
B) Relay
C) Ignition switch
D) All of the above

Question 23

Which type of circuit has multiple paths for current flow?

A) Series
B) Series-parallel
C) Parallel
D) Both B and C

Question 24

What is the reason for using braided copper wire in vehicle electrical circuits rather than solid copper wire?

A) Conducts more current
B) Greater flexibility
C) More resistant to corrosion
D) Conducts at lower temperatures

Question 25

A series circuit has a 12-volt power source and two resistors of 1 ohm and 2 ohms respectively.How many amps will flow when the circuit is closed?

A) 4 amps
B) 3 amps
C) 6 amps
D) 15 amps

Question 26

Technician A says that a cathode has an excess of electrons.Technician B says when a cathode is connected to an anode by a conductor,electrons will flow from the cathode to the anode.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 27

In which of the following circuits would current flow be the same at any point in the circuit when it is energized?

A) Series
B) Series-parallel
C) Parallel
D) None of the above

Question 28

Technician A says that after a balloon is rubbed on a wool sweater,it should stick to a wall.Technician B says that if two balloons are rubbed on a wool sweater,they should stick to each other? Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 29

Which of the following electromagnets would produce the greatest magnetomotive force?

A) A coil of wire with 1,000 turns and 10 amperes of current
B) 10,000 ampere-turns wrapped around an iron core
C) 100 turns of wire flowing 50 amps of current
D) 1 amp of current through 5,000 turns of wire

Question 30

If an additional current path to ground is added to a series circuit,what type of circuit has been created?

A) Series
B) Series-parallel
C) Parallel
D) None of the above

Question 31

Which of the following devices does NOT rely upon the principles of electromagnetism to function?

A) Solenoid
B) Headlight
C) Relay
D) Ignition coil

Question 32

If a terminal has a deficit of electrons,it would be known as a:

A) cathode
B) anode
C) electrode
D) neutral post

Question 33

Which of the following functions can be performed by capacitors in vehicle electrical circuits?

A) Power supply filter
B) Spike suppression
C) Reshaping wave forms
D) All of the above

Question 34

How many volts are required to push 3 amps through a resistance of 4 ohms?

A) 1 volt
B) 12 volts
C) 7 volts
D) 1 1/4 volts

Question 35

If an additional current path is added to a parallel circuit what must happen to total circuit resistance?

A) Decreases
B) Increases
C) Remains the same
D) No current flow

Question 36

Which of the following is NOT a true expression of Ohm's law?

A) E = I × R
B) Volts = Amps × Ohms
C) I = E/R
D) Amps = Ohms/Volts

Question 37

Which of the following circuit faults will NOT result in overheating the circuit?

A) Short circuit
B) Open circuit
C) Short to ground
D) High resistance

Question 38

What is the voltage drop across a 2-ohm resistor used in a 12-volt series circuit that is flowing 1.5 amps?

A) 3 volts
B) 9 volts
C) 12 volts
D) 1.5 volts

Question 39

If you rub a balloon on a wool sweater,which of the following will result?

A) Balloon acquires a positive charge
B) Balloon acquires a negative charge
C) Balloon bursts
D) Balloon becomes electrically neutral

Question 40

Which of the following circuits has only one path for current to flow?

A) Parallel
B) Series
C) Series-parallel
D) None of the above

Question 41

Which of the following devices works on an opposite principle to an electric motor?

A) diode
B) generator
C) transformer
D) capacitor

Question 42

Calculate the electrical pressure required to flow 6 amps through a 2 ohm resistance

A) 3 volts
B) .33 volts
C) 6 volts
D) 12 volts

Question 43

INSERT FIGURE 5-29 FROM TEXTBOOK IMMEDIATELY ABOVE THIS QUESTION.Referencing the above figure,use Ohm's Law to calculate current flow.Which of the following is correct?

A) 12 amps
B) 4 amps
C) 3 amps
D) 3 ohms

Question 44

INSERT FIGURE 5-30 FROM TEXTBOOK IMMEDIATELY ABOVE THIS QUESTION.Referencing the above figure,use Ohm's Law to calculate total circuit resistance.Which of the following is correct?

A) 1.5 ohms
B) 3 ohms
C) 4 ohms
D) 8 ohms

Question 45

INSERT FIGURE 5-30 FROM TEXTBOOK IMMEDIATELY ABOVE THIS QUESTION.Referencing the above figure,use Ohm's Law to calculate current flow.Which of the following is correct?

A) 2 amps
B) 4 amps
C) 8 amps
D) 12 amps

Question 46

What is used to separate the two conductors in a capacitor?

A) magnetic field
B) rubber insulator
C) dielectric
D) nothing,they must contact each other

Question 47

INSERT FIGURE 5-31 FROM TEXTBOOK IMMEDIATELY ABOVE THIS QUESTION.Referencing the above figure,calculate the voltage drop across the 2 ohm resistor.Which of the following is correct?

A) 1.5 volts
B) 3 volts
C) 9 volts
D) 12 volts

Question 48

The sum of all the voltage drops in an electrical circuit should be:

A) equal to source voltage
B) equivalent to zero voltage
C) equal to the resistance in the circuit
D) equivalent to the amperage

Question 49

What is visible light,such as that radiated by a light bulb,known as?

A) protons
B) photons
C) electrons
D) neutrons

Question 50

Technician A says that the charge differential stored in a capacitor is held until its plates are connected to a lower voltage source.Technician B says that over time,stored electrons on a capacitor plate will leak through the dielectric until both plates have an equal charge.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 51

A commonly used sensor that induces an AC voltage by having a rotating reluctor cut through a permanent magnetic field is used for:

A) wheel speed sensors
B) transmission tailshaft speed sensors
C) engine speed sensors
D) all of the above

Question 52

INSERT FIGURE 5-31 FROM TEXTBOOK IMMEDIATELY ABOVE THIS QUESTION.Referencing the above figure,calculate the voltage drop across the complete series circuit.Which of the following is correct?

A) 1.5 volts
B) 3 volts
C) 9 volts
D) 12 volts

Question 53

Calculate the power consumed by a 2 amp lightbulb in a 12-volt circuit.

A) 12 W
B) 18 W
C) 24 W
D) 48 W

Question 54

When a dead short occurs,what happens to circuit resistance?

A) Increases to a dangerous level
B) Significantly reduced
C) Not affected
D) Increases a small amount

Question 55

What is capacitance measured in?

A) volts
B) amps
C) coulombs
D) farads

Question 56

INSERT FIGURE 5-31 FROM TEXTBOOK IMMEDIATELY ABOVE THIS QUESTION.Referencing the above figure,calculate the voltage drop across the 6 ohm resistor.Which of the following is correct?

A) 1.5 volts
B) 3 volts
C) 9 volts
D) 12 volts