California Electrical License Exam 2026 – 150 Practice Questions
with Answers & Detailed Rationales, Electrical Theory, National
Electrical Code (NEC), Wiring Methods, Circuit Calculations,
Grounding, Bonding & Electrical Safety for Journeyman and Master
Electricians
Section 1: Electrical Theory and Fundamentals
Question 1
A circuit has a voltage of 240 V and a resistance of 12 Ω. What is the current flowing through
the circuit?
A. 10 A
B. 20 A
C. 24 A
D. 40 A
Correct Answer: B
Explanation: Applying Ohm’s Law (I = V ÷ R), 240 volts divided by 12 ohms equals 20
amperes of current flow.
Question 2
Which unit of measurement is used to quantify electrical resistance?
A. Volt
B. Ampere
C. Ohm
D. Watt
,Correct Answer: C
Explanation: Resistance is measured in ohms (Ω), representing how much a material
opposes the flow of electric current.
Question 3
A resistor has a resistance of 15 Ω and carries a current of 4 A. What is the voltage drop
across the resistor?
A. 30 V
B. 45 V
C. 60 V
D. 75 V
Correct Answer: C
Explanation: Using V = I × R, 4 amperes multiplied by 15 ohms equals 60 volts dropped
across the resistor.
Question 4
What happens to the total resistance when additional resistors are connected in series?
A. The total resistance decreases.
B. The total resistance increases.
C. The total resistance remains constant.
D. The total resistance becomes zero.
Correct Answer: B
,Explanation: In a series circuit, total resistance equals the sum of individual resistances, so
each added resistor increases opposition to current flow.
Question 5
In a parallel circuit, what is the voltage across each branch equal to?
A. Zero
B. The source voltage
C. Different for every resistor
D. Half the source voltage
Correct Answer: B
Explanation: Components connected in parallel all share the same voltage potential, which
equals the source voltage.
Question 6
Which instrument is connected in series with a circuit to measure current?
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Wattmeter
Correct Answer: B
Explanation: An ammeter must be placed in series so that all current flows through it,
allowing accurate measurement of amperes.
, Question 7
A purely resistive AC circuit has a power factor of:
A. 0
B. 0.5
C. 0.707
D. 1.0
Correct Answer: D
Explanation: In a purely resistive circuit, voltage and current are perfectly in phase, yielding a
power factor of unity (1.0).
Question 8
The RMS value of a sinusoidal waveform is approximately what percentage of the peak
value?
A. 50%
B. 63.7%
C. 70.7%
D. 100%
Correct Answer: C
Explanation: RMS equals peak divided by the square root of 2, which is approximately 0.707
or 70.7% of peak.
Question 9
What is the unit of measurement for inductance?
with Answers & Detailed Rationales, Electrical Theory, National
Electrical Code (NEC), Wiring Methods, Circuit Calculations,
Grounding, Bonding & Electrical Safety for Journeyman and Master
Electricians
Section 1: Electrical Theory and Fundamentals
Question 1
A circuit has a voltage of 240 V and a resistance of 12 Ω. What is the current flowing through
the circuit?
A. 10 A
B. 20 A
C. 24 A
D. 40 A
Correct Answer: B
Explanation: Applying Ohm’s Law (I = V ÷ R), 240 volts divided by 12 ohms equals 20
amperes of current flow.
Question 2
Which unit of measurement is used to quantify electrical resistance?
A. Volt
B. Ampere
C. Ohm
D. Watt
,Correct Answer: C
Explanation: Resistance is measured in ohms (Ω), representing how much a material
opposes the flow of electric current.
Question 3
A resistor has a resistance of 15 Ω and carries a current of 4 A. What is the voltage drop
across the resistor?
A. 30 V
B. 45 V
C. 60 V
D. 75 V
Correct Answer: C
Explanation: Using V = I × R, 4 amperes multiplied by 15 ohms equals 60 volts dropped
across the resistor.
Question 4
What happens to the total resistance when additional resistors are connected in series?
A. The total resistance decreases.
B. The total resistance increases.
C. The total resistance remains constant.
D. The total resistance becomes zero.
Correct Answer: B
,Explanation: In a series circuit, total resistance equals the sum of individual resistances, so
each added resistor increases opposition to current flow.
Question 5
In a parallel circuit, what is the voltage across each branch equal to?
A. Zero
B. The source voltage
C. Different for every resistor
D. Half the source voltage
Correct Answer: B
Explanation: Components connected in parallel all share the same voltage potential, which
equals the source voltage.
Question 6
Which instrument is connected in series with a circuit to measure current?
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Wattmeter
Correct Answer: B
Explanation: An ammeter must be placed in series so that all current flows through it,
allowing accurate measurement of amperes.
, Question 7
A purely resistive AC circuit has a power factor of:
A. 0
B. 0.5
C. 0.707
D. 1.0
Correct Answer: D
Explanation: In a purely resistive circuit, voltage and current are perfectly in phase, yielding a
power factor of unity (1.0).
Question 8
The RMS value of a sinusoidal waveform is approximately what percentage of the peak
value?
A. 50%
B. 63.7%
C. 70.7%
D. 100%
Correct Answer: C
Explanation: RMS equals peak divided by the square root of 2, which is approximately 0.707
or 70.7% of peak.
Question 9
What is the unit of measurement for inductance?
