2 0 2 4 /2025 | © copyright | This work may not be copied for profit gain Excel!
Automotive Electronics Practice Test
Questions and Correct Answers the Latest
Update and Recommended Version
A series circuit has three resistors of 4 ohms each. The voltage drop across each resistor is 4
volts. Technician A says that the source voltage is 12 volts. Technician B says that the total
resistance is 18 ohms. Which technician is correct?
Tech A
Tech B
Both
Neither
→ Tech A
A vehicle has four parking lights all connected in parallel and one of the bulbs burns out.
Technician A says that this could cause the parking light fuse to blow (open). Technician B says
that it would decrease the current in the circuit. Which technician is correct?
Tech A
Tech B
Both
Neither
→ Tech B
As additional branches are added to a a parallel circuit, total circuit resistance ________.
Remains the same
1|Page| GradeA+ | 2 0 0 2 5
,2 0 2 4 /2025 | © copyright | This work may not be copied for profit gain Excel!
Decreases
Increases
None of the above
→ Decreases
Calculate the total resistance and current in a 12-volt parallel circuit with three resistors of 4
ohms, 8 ohms, and 16 ohms, using any one of the five methods (calculator suggested). What
are the total resistance and current?
140 ohms (18 amps)
4 ohms (3.0 amps)
2.3 ohms (5.3 amps)
22 ohms (0.4 amps)
→ 2.3 ohms
If one branch of a parallel circuit loses continuity, the other branches will still each receive
source voltage and ground.
True
False
→ True
If the resistance and the voltage are known, what is the formula for finding the current
(amperes)?
I=ExR
1|Page| GradeA+ | 2 0 0 2 5
,2 0 2 4 /2025 | © copyright | This work may not be copied for profit gain Excel!
E=IxR
R=ExI
I=E/R
→ I=E/R
In a series circuit, total circuit resistance is equal to the ________ of the resistance of all loads
in the circuit.
Sum
Dividend
Difference
None of the Above
→ Sum
Kirchhoff's law states that the voltage around a closed circuit is equal to the sum of the
________ across all the loads.
Voltage drops
Resistances
Both A & B
Neither A nor B
→ Voltage drops
More electrical current will tend to flow through the branch of a parallel circuit with ________
resistance.
1|Page| GradeA+ | 2 0 0 2 5
, 2 0 2 4 /2025 | © copyright | This work may not be copied for profit gain Excel!
Infinite
Lowest
Highest
None of the Above
→ Lowest
Technician A says that electronic calculators have a memory function that can be used to
calculate resistance, current, and voltage values for a parallel circuit. Technician B says that
components of a series-parallel circuit are separated to simplify calculations. Which technician
is correct?
Tech A
Tech B
Both
Neither
→ Both
The amperage in a series circuit ________.
Is always less returning than leaving the battery.
Is the same anywhere in the circuit.
Is high at the beginning of the circuit and decreases as the current flows through the resistance.
Varies in the circuit due to the different resistances.
→ Is the same anywhere in the circuit.
1|Page| GradeA+ | 2 0 0 2 5
Automotive Electronics Practice Test
Questions and Correct Answers the Latest
Update and Recommended Version
A series circuit has three resistors of 4 ohms each. The voltage drop across each resistor is 4
volts. Technician A says that the source voltage is 12 volts. Technician B says that the total
resistance is 18 ohms. Which technician is correct?
Tech A
Tech B
Both
Neither
→ Tech A
A vehicle has four parking lights all connected in parallel and one of the bulbs burns out.
Technician A says that this could cause the parking light fuse to blow (open). Technician B says
that it would decrease the current in the circuit. Which technician is correct?
Tech A
Tech B
Both
Neither
→ Tech B
As additional branches are added to a a parallel circuit, total circuit resistance ________.
Remains the same
1|Page| GradeA+ | 2 0 0 2 5
,2 0 2 4 /2025 | © copyright | This work may not be copied for profit gain Excel!
Decreases
Increases
None of the above
→ Decreases
Calculate the total resistance and current in a 12-volt parallel circuit with three resistors of 4
ohms, 8 ohms, and 16 ohms, using any one of the five methods (calculator suggested). What
are the total resistance and current?
140 ohms (18 amps)
4 ohms (3.0 amps)
2.3 ohms (5.3 amps)
22 ohms (0.4 amps)
→ 2.3 ohms
If one branch of a parallel circuit loses continuity, the other branches will still each receive
source voltage and ground.
True
False
→ True
If the resistance and the voltage are known, what is the formula for finding the current
(amperes)?
I=ExR
1|Page| GradeA+ | 2 0 0 2 5
,2 0 2 4 /2025 | © copyright | This work may not be copied for profit gain Excel!
E=IxR
R=ExI
I=E/R
→ I=E/R
In a series circuit, total circuit resistance is equal to the ________ of the resistance of all loads
in the circuit.
Sum
Dividend
Difference
None of the Above
→ Sum
Kirchhoff's law states that the voltage around a closed circuit is equal to the sum of the
________ across all the loads.
Voltage drops
Resistances
Both A & B
Neither A nor B
→ Voltage drops
More electrical current will tend to flow through the branch of a parallel circuit with ________
resistance.
1|Page| GradeA+ | 2 0 0 2 5
, 2 0 2 4 /2025 | © copyright | This work may not be copied for profit gain Excel!
Infinite
Lowest
Highest
None of the Above
→ Lowest
Technician A says that electronic calculators have a memory function that can be used to
calculate resistance, current, and voltage values for a parallel circuit. Technician B says that
components of a series-parallel circuit are separated to simplify calculations. Which technician
is correct?
Tech A
Tech B
Both
Neither
→ Both
The amperage in a series circuit ________.
Is always less returning than leaving the battery.
Is the same anywhere in the circuit.
Is high at the beginning of the circuit and decreases as the current flows through the resistance.
Varies in the circuit due to the different resistances.
→ Is the same anywhere in the circuit.
1|Page| GradeA+ | 2 0 0 2 5
