LADWP Electrical Repairer Exam – 3853
Exam Practice Questions and Correct
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DOMAIN I — ELECTRICAL FUNDAMENTALS
Question 1
According to Ohm's law, what happens to current when resistance increases while
voltage remains constant?
A. Current increases
B. Voltage increases
C. Current decreases
D. Power factor becomes zero
Correct Answer: C
Ohm's law is I=V/RI=V/R. When voltage remains constant, increasing resistance
causes current to decrease.
Question 2
A 120-volt circuit has a resistance of 30 ohms. What current flows through the
circuit?
A. 2 amperes
B. 4 amperes
C. 30 amperes
D. 3,600 amperes
Correct Answer: B
,Using Ohm's law, I=V/RI=V/R. Therefore, 120/30=4120/30=4 amperes.
Question 3
What is the primary function of a conductor in an electrical circuit?
A. Prevent current flow
B. Convert AC to DC
C. Provide a path for electrical current
D. Increase circuit resistance
Correct Answer: C
A conductor contains charge carriers that can move readily, providing a relatively
low-resistance path for current.
Question 4
Which material is commonly used as an electrical conductor because of its high
conductivity?
A. Rubber
B. Glass
C. Porcelain
D. Copper
Correct Answer: D
Copper has high electrical conductivity, good mechanical properties, and is widely
used for electrical conductors.
Question 5
What is electrical resistance?
A. The force that produces magnetic flux
B. Opposition to the flow of electric current
C. The amount of electrical charge stored in a battery
D. The frequency of an AC waveform
Correct Answer: B
,Resistance opposes current flow. In a simple DC circuit, the relationship among
voltage, current, and resistance is described by Ohm's law.
Question 6
What unit is used to measure electrical resistance?
A. Volt
B. Ampere
C. Watt
D. Ohm
Correct Answer: D
The ohm (Ω) is the SI unit of electrical resistance.
Question 7
What unit is used to measure electrical power?
A. Ampere
B. Ohm
C. Watt
D. Henry
Correct Answer: C
The watt is the unit of electrical power. In a simple DC circuit, power can be
calculated as P=VIP=VI.
Question 8
A load operates at 240 volts and draws 10 amperes. What is its electrical power in
a simple DC calculation?
A. 24 watts
B. 240 watts
C. 2,400 watts
D. 24,000 watts
Correct Answer: C
, Power is voltage multiplied by current: P=240×10=2,400P=240\times10=2,400
watts.
DOMAIN II — AC/DC CIRCUITS & ELECTRICAL MEASUREMENTS
Question 9
What does an ammeter measure?
A. Resistance
B. Voltage
C. Current
D. Frequency
Correct Answer: C
An ammeter measures electrical current, normally in amperes.
Question 10
How is an ammeter normally connected when measuring current in a circuit?
A. In parallel with the entire circuit
B. Across the power source only
C. In series with the circuit being measured
D. Across the equipment grounding conductor
Correct Answer: C
Current must flow through the ammeter so that the instrument can measure it.
Therefore, an ammeter is connected in series with the circuit.
Question 11
What does a voltmeter measure?
A. Current
B. Potential difference
C. Resistance only
D. Motor speed
Correct Answer: B
Exam Practice Questions and Correct
Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
DOMAIN I — ELECTRICAL FUNDAMENTALS
Question 1
According to Ohm's law, what happens to current when resistance increases while
voltage remains constant?
A. Current increases
B. Voltage increases
C. Current decreases
D. Power factor becomes zero
Correct Answer: C
Ohm's law is I=V/RI=V/R. When voltage remains constant, increasing resistance
causes current to decrease.
Question 2
A 120-volt circuit has a resistance of 30 ohms. What current flows through the
circuit?
A. 2 amperes
B. 4 amperes
C. 30 amperes
D. 3,600 amperes
Correct Answer: B
,Using Ohm's law, I=V/RI=V/R. Therefore, 120/30=4120/30=4 amperes.
Question 3
What is the primary function of a conductor in an electrical circuit?
A. Prevent current flow
B. Convert AC to DC
C. Provide a path for electrical current
D. Increase circuit resistance
Correct Answer: C
A conductor contains charge carriers that can move readily, providing a relatively
low-resistance path for current.
Question 4
Which material is commonly used as an electrical conductor because of its high
conductivity?
A. Rubber
B. Glass
C. Porcelain
D. Copper
Correct Answer: D
Copper has high electrical conductivity, good mechanical properties, and is widely
used for electrical conductors.
Question 5
What is electrical resistance?
A. The force that produces magnetic flux
B. Opposition to the flow of electric current
C. The amount of electrical charge stored in a battery
D. The frequency of an AC waveform
Correct Answer: B
,Resistance opposes current flow. In a simple DC circuit, the relationship among
voltage, current, and resistance is described by Ohm's law.
Question 6
What unit is used to measure electrical resistance?
A. Volt
B. Ampere
C. Watt
D. Ohm
Correct Answer: D
The ohm (Ω) is the SI unit of electrical resistance.
Question 7
What unit is used to measure electrical power?
A. Ampere
B. Ohm
C. Watt
D. Henry
Correct Answer: C
The watt is the unit of electrical power. In a simple DC circuit, power can be
calculated as P=VIP=VI.
Question 8
A load operates at 240 volts and draws 10 amperes. What is its electrical power in
a simple DC calculation?
A. 24 watts
B. 240 watts
C. 2,400 watts
D. 24,000 watts
Correct Answer: C
, Power is voltage multiplied by current: P=240×10=2,400P=240\times10=2,400
watts.
DOMAIN II — AC/DC CIRCUITS & ELECTRICAL MEASUREMENTS
Question 9
What does an ammeter measure?
A. Resistance
B. Voltage
C. Current
D. Frequency
Correct Answer: C
An ammeter measures electrical current, normally in amperes.
Question 10
How is an ammeter normally connected when measuring current in a circuit?
A. In parallel with the entire circuit
B. Across the power source only
C. In series with the circuit being measured
D. Across the equipment grounding conductor
Correct Answer: C
Current must flow through the ammeter so that the instrument can measure it.
Therefore, an ammeter is connected in series with the circuit.
Question 11
What does a voltmeter measure?
A. Current
B. Potential difference
C. Resistance only
D. Motor speed
Correct Answer: B
