Automotive Electronics Practice Test
Questions and Answers 100% Pass
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
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,Neither - ✔✔Tech B
As additional branches are added to a a parallel circuit, total circuit resistance ________.
Remains the same
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
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,If the resistance and the voltage are known, what is the formula for finding the current
(amperes)?
I=ExR
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
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, Neither A nor B - ✔✔Voltage drops
More electrical current will tend to flow through the branch of a parallel circuit with
________ resistance.
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.
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Questions and Answers 100% Pass
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
100% Pass Guarantee Olivia West, All Rights Reserved © 2025 1
,Neither - ✔✔Tech B
As additional branches are added to a a parallel circuit, total circuit resistance ________.
Remains the same
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
100% Pass Guarantee Olivia West, All Rights Reserved © 2025 2
,If the resistance and the voltage are known, what is the formula for finding the current
(amperes)?
I=ExR
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
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, Neither A nor B - ✔✔Voltage drops
More electrical current will tend to flow through the branch of a parallel circuit with
________ resistance.
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.
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