Question 1

The unit for measuring electrical pressure (force) is _____.
A) amperes
B) ohms
C) volts
D) watts

Accepted Answer

The unit for measuring electrical pressure (force) is volts. Amperes measure the flow (current) of electricity, ohms measure electrical resistance, and watts measure electrical power.

Question 2

Technician A says current will increase with a decrease in resistance. Technician B says current will decrease with an increase in resistance. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Accepted Answer

According to Ohm's Law (I = V/R), current (I) increases when resistance (R) decreases and decreases when resistance increases, assuming voltage (V) is constant. Both technicians are correct.

Question 3

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

Accepted Answer

Current 14-volt systems are typically rated between 800 W to 1500 W, which is supported by Technician A. Technician B is incorrect because increasing voltage actually reduces the amperage required to produce the same wattage, according to the formula P=VI (Power = Voltage x Current). Therefore, only Technician A is correct.

Question 4

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

Accepted Answer

Both technicians have their definitions of open and closed circuits backwards. An open circuit is when the path is broken or interrupted, while a closed circuit is when there is a complete path for current flow. Neither technician is correct.

Question 5

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

Accepted Answer

In a parallel circuit, the voltage drop across each leg is the same and equals the total voltage, not the combined voltage drop of all legs.

Question 6

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

Accepted Answer

The answer of Technician A says the conventional theory of...

Question 7

All the following are used as circuit protection EXCEPT:
A) fuse
B) relay
C) circuit breaker
D) fuse link

Accepted Answer

The answer of All the following are used as circuit...

Question 8

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

Accepted Answer

Late model cars do use maxifuses instead of fusible links, which is confirmed by Technician A. Fusible links are also usually found in the engine compartment near the battery, which is confirmed by Technician B. Therefore, both technicians are correct.

Question 9

Which of the following is a source of energy in an automobile's electrical system?
A) battery
B) AC generator
C) both "battery" and "AC generator"
D) neither "battery" nor "AC generator"

Accepted Answer

The battery provides energy when the engine is off, and the AC generator (alternator) provides energy when the engine is running.

Question 10

A _____ is an electromagnet with a movable core that converts electrical current into mechanical movement.
A) stator
B) magneto
C) reluctor
D) solenoid

Accepted Answer

The description matches the definition of a solenoid, which is an electromagnet with a movable core that converts electrical current into mechanical movement. A stator is a stationary component in an electric motor, a magneto is a type of electrical generator, and a reluctor is a device used in some types of electronic sensors.

Question 11

The amount of electricity produced in the vehicle's generator is dependent 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 answers are correct

Accepted Answer

The electricity produced in a generator depends on the strength of the magnetic field, the number of wires, and the speed at which the magnetic field passes through the wires, as all these factors influence electromagnetic induction.

Question 12

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

Accepted Answer

The total resistance is equal to the sum of all the resistances in the series circuit.

Question 13

In the formula E = I x R, I represents_____.
A) current
B) resistance
C) voltage
D) wattage

Accepted Answer

Current is represented by the letter I in the formula E = I x R.

Question 14

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

Accepted Answer

Technician A is correct because moving magnetic fields are used in alternators to generate electrical energy. Technician B is also correct because chemical reactions in the battery provide electrical energy.

Question 15

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 is very dangerous and can kill you if your skin comes into contact with exposed wiring. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Accepted Answer

Higher voltage systems can use smaller wires because they carry the same power with less current. However, 42 volts is generally not considered lethal under normal circumstances.

Question 16

In the formula E = I x R, R represents_____.
A) current
B) resistance
C) voltage
D) wattage

Accepted Answer

In the formula E = I x R, known as Ohm's Law, R represents resistance.

Question 17

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

Accepted Answer

Both Technician A and Technician B are correct. The amount of electricity produced by an AC generator is directly proportional to the strength of the magnetic field and the speed at which the magnetic field moves past the wires. This is known as Faraday's Law of Electromagnetic Induction.

Question 18

In the formula E = I x R, E represents _____.
A) current
B) resistance
C) voltage
D) wattage

Accepted Answer

In the formula E = I x R, E represents voltage, where I is the current and R is the resistance. This is known as Ohm's Law.

Question 19

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

Accepted Answer

In the context of switches, "pole" refers to the number of separate circuits that the switch can control, not the number of output circuits specifically. "Throw" indicates the number of positions that each switch pole can connect to, not the number of input circuits. Therefore, both Technician A and Technician B are incorrect in their definitions.

Question 20

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

Accepted Answer

Technician A is correct because in the American Wire Gauge (AWG) system, a lower gauge number means a larger wire diameter. Therefore, an AWG 20 gauge wire is indeed larger than an AWG 22 gauge wire. Technician B is incorrect because in metric wire sizes, a larger number indicates a larger diameter, so a metric 1.0 gauge wire is larger, not smaller, than a metric .8 gauge wire.

Quiz 15: Basics of Electrical Systems

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

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

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?

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?

Which of the statements concerning parallel circuits is NOT true?

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?

All the following are used as circuit protection EXCEPT:

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?

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

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

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

Which statement concerning series circuits is NOT true?

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

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

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 is very dangerous and can kill you if your skin comes into contact with exposed wiring. Who is correct?

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

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?

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

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?

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.