Deck 15: Basics of Electrical Systems

Question 1

The unit for measuring electrical resistance is _____.

A)amperes
B)ohms
C)volts
D)watts

Answer 1

B

Question 2

What is the name of the formula E = I x R?

A)Ampere's law
B)Voltaire's law
C)Watt's law
D)Ohm's law

Answer 2

D

Question 3

A series circuit provides two or more different paths for the current to flow through.

Answer 3

False

Question 4

The term ampere was assigned to units of current in honor of André Ampere, who studied the relationship between electricity and magnetism.

Question 5

One watt is equal to one volt multiplied by one ampere.

Question 6

A parallel circuit can only have one load on each leg.

Question 7

Increasing the voltage of an automotive electrical system allows the wires to be smaller yet supply the same electrical power as a low-voltage system with larger wires.

Question 8

Which type of resistor is commonly used in automotive circuits?

A)fixed value
B)stepped
C)variable
D)All the answers are correct.

Question 9

To complete the electrical path to the vehicle's battery, the vehicle's metal frame components are often part of the electrical circuit.

Question 10

Voltage stays constant in a closed electrical circuit, but the amperage drops as it powers a load.

Question 11

The unit for measuring electrical current is _____.

A)amperes
B)ohms
C)volts
D)watts

Question 12

Alternating current constantly changes in voltage and direction.

Question 13

Amperage stays constant in a circuit, but the voltage drops as it powers a load.

Question 14

Electromotive force is measured in volts.

Question 15

The chemical reaction in a battery causes a lack of electrons at the positive (+)terminal.

Question 16

If there is voltage in a circuit, there must be electrons flowing through the circuit.

Question 17

When an electron leaves the orbit of an atom, the atom then has a positive charge.

Question 18

Electricity is the flow of protons from one atom to another.

Question 19

A circuit protection device such as a fuse, fuse link, or circuit breaker will open the circuit if resistance values become too great.

Question 20

What is the current in a 12-volt circuit with a 6-ohm resistor connected series?

A)2 amps
B)4 amps
C)6 amps
D)12 amps

Question 21

Technician A says moving magnetic fields are a source of electrical energy in an automobile. Technician B says chemical reaction is the only source of electrical energy in an automobile. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 22

All the following parts are used as circuit protection EXCEPT:

A)fuse
B)relay
C)circuit breaker
D)fuse link

Question 23

Technician A says late model cars use maxifuses instead of fusible links. Technician B says fusible links are normally found in the engine compartment near the battery. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 24

Technician A says the conventional theory of current flow states that current flows from negative to positive. Technician B says the electron current flow theory states that electrons move from negative to positive. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 25

Technician A says when there is a complete path through the electrical circuit, the circuit is said to be open. Technician B says when the circuit path is broken or interrupted the circuit is said to be closed. Who is right?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 26

Technician A says current 14-volt systems are rated at 800 W to 1500 W. Technician B says a higher voltage system requires more amperage to produce the same wattage. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 27

Which of the following is a source of energy in an automobile's electrical system?

A)battery
B)AC generator
C)both A and B
D)neither A nor B

Question 28

Technician A says 42-volt automotive electrical systems can use smaller wires to supply the same amount of power to electrical accessories. Technician B says a 42-volt electrical system can kill you if your skin contacts exposed wiring. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 29

A _____ is an electromagnet with a movable core that converts electrical current into mechanical movement.

A)stator
B)magneto
C)reluctor
D)solenoid

Question 30

In the formula E = I x R, the I represents_____.

A)current
B)resistance
C)voltage
D)wattage

Question 31

Technician A says the amount of electricity produced by an AC generator depends on the strength of the magnetic field. Technician B says it depends on the speed at which the magnetic field moves past the wires. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 32

Technician A says current will decrease with a decrease in resistance. Technician B says current will increase with an increase in resistance. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 33

Which statement concerning series circuits is NOT true?

A)The sum of the voltage drops equals the source voltage
B)The amount of current (amperes)flowing through the circuit is the same throughout the circuit
C)The voltage drop across each load is different if the resistance of the loads is different
D)The total resistance is equal to the lowest resistance in the circuit

Question 34

In the formula E = I x R, the R represents_____.

A)current
B)resistance
C)voltage
D)wattage

Question 35

In the formula E = I x R, the E represents _____.

A)current
B)resistance
C)voltage
D)wattage

Question 36

Which of the statements concerning parallel circuits is NOT true?

A)The total circuit resistance is always lower than the resistance of the leg with the lowest resistance
B)The current through each leg will be different if the resistance of the loads in each leg is different
C)The sum of the current of all the legs is the total circuit current
D)The combined voltage drop of all the legs equals the total voltage drop

Question 37

Switches are being discussed. Technician A says that "pole" refers to the number of output circuits. Technician B says that "throw" refers to the number of input circuits. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 38

The amount of electricity produced in the vehicle's generator depends on _____.

A)the strength of the magnetic field
B)the number of wires that are passed through the magnetic field
C)the speed at which the magnetic field passes through the wires
D)All the answers are correct.

Question 39

The unit for measuring electrical pressure (force)is _____.

A)amperes
B)ohms
C)volts
D)watts

Question 40

Wire sizes are being discussed. Technician A says an AWG 20 gauge wire is larger than an AWG 22 gauge wire. Technician B says a metric 1.0 gauge wire is smaller than a metric .8 gauge wire.

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 41

In a series circuit, current is always ____________________ throughout the circuit.

Question 42

All the following are variable resistors EXCEPT:

A)potentiometer
B)resistor wire
C)rheostat
D)thermistor

Question 43

Electromotive force is usually called ____________________.

Question 44

Electrical power is measured in ____________________.

Question 45

A simple on/off switch with one input terminal and one output is a _____type switch.

A)SPDT (single pole, double throw)
B)SPST (single pole, single throw)
C)DPDT (double pole, double throw)
D)MPMT (multipole, multi throw)

Question 46

Electrons have a ____________________ charge.

Question 47

____________________ are materials that have a low resistance to the flow of current.

Question 48

Technician A disconnects the battery ground cable prior to replacing a fusible link. Technician B uses a fusible link that is larger [lower gauge number] than the circuit it protects. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 49

____________________ are materials that resist the flow of current.

Question 50

The process of generating electricity by moving a wire through a magnetic field is called ____________________.

Question 51

A momentary contact switch is used to operate the _____.

A)headlights (on/off)
B)heater fan
C)horn
D)turn signals

Question 52

The function of a resistor in an electrical circuit is to limit _____.

A)voltage
B)current (amperes)
C)resistance (ohms)
D)power (watts)

Question 53

The current in an electrical circuit ____________________ when the resistance increases.

Question 54

The electrical principle that states "the sum of the voltage drops in a closed circuit equals the voltage applied to that circuit" is known as _____ law.

A)Ohm's
B)Watt's
C)Kirchoff's
D)Ampere's

Question 55

The resistance of the load(s)in an AC [alternating current] circuit is called ____________________.

Question 56

The electrical system of a modern automobile runs at _____ volts when the engine is running.

A)12.0
B)12.6
C)14.0
D)15.6

Question 57

Circuit breakers are being discussed. Technician A says after the circuit breaker is tripped, it must be reset by pressing a button on the breaker. Technician B says some circuit breakers automatically reset after the power has been turned off for a few seconds. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 58

Secondary wire is used to power _____.

A)spark plugs
B)starter
C)AC generator (alternator)
D)All the answers are correct.

Question 59

An atom that has lost an electron has a ____________________ charge.

Question 60

The voltage in a hybrid vehicle can range up to _____ volts.

A)42
B)175
C)600
D)1,000

Question 61

What factors affect the resistance of a copper wire?

Question 62

As temperature increases, the resistance of a NTC [negative temperature coefficient] thermistor ____________________.

Question 63

A circuit that is complete and does not have anything to prevent the flow of electrical current through it has ____________________.

Question 64

Why is a relay used in a circuit?

Question 65

What is electromagnetic induction?

Question 66

Describe the formula for power (Watt's law).

Question 67

A circuit that is incomplete is called a(n)____________________ circuit.

Question 68

What is a relay?

Question 69

What is a solenoid?

Question 70

Describe the difference between alternating and direct current.

Question 71

Why can wire sizes be smaller when higher system voltages are used?

Question 72

What is the difference between voltage and current?

Question 73

Identify the four basic parts of a typical automobile electrical circuit.

Question 74

Describe the difference between the terms "electrical" and "electronics."

Question 75

Name the four basic components of all electrical circuits.