LADWP ELECTRICAL CRAFT HELPER EXAM
WITH ACTUAL QUESTIONS AND VERIFIED
ANSWERS, PLUS EXPLAINED
RATIONALES/EXPERT VERIFIED FOR
GUARANTEED 100% PASS 2026/LATEST
UPDATE/INSTANT DOWNLOAD PDF
1.
An electrical craft helper is preparing to assist with work on a 480-volt
motor circuit. Before beginning the task, the circuit is identified and the
disconnect is opened. According to proper electrical safety practice,
what is the MOST important next step before treating the circuit as de-
energized?
A. Begin removing the motor junction-box cover
B. Verify absence of voltage using an appropriately rated test instrument
C. Place the motor starter in the OFF position
D. Ask another worker whether the circuit is normally energized
Answer: B. Verify absence of voltage using an appropriately rated
test instrument
Rationale: Opening a disconnect does not by itself prove that a circuit
is de-energized. The circuit must be properly isolated and the absence
of voltage verified with a suitable, properly rated test instrument. This
is a fundamental electrical-safety practice because incorrect
identification, backfeeds, or failed disconnects can leave conductors
energized.
2.
Which unit is used to measure electrical resistance?
1
,A. Ampere
B. Volt
C. Ohm
D. Watt
Answer: C. Ohm
Rationale: Resistance is measured in ohms (Ω). Voltage is measured
in volts, current in amperes, and power in watts. Understanding these
fundamental electrical quantities is essential when assisting
electricians with troubleshooting and installation work.
3.
An electrician asks a helper to identify the conductor intended to provide
a low-resistance path for fault current back to the source. Which
conductor is being described?
A. Equipment grounding conductor
B. Ungrounded conductor
C. Switched conductor
D. Neutral load conductor
Answer: A. Equipment grounding conductor
Rationale: The equipment grounding conductor provides a path for
fault current so that protective devices can operate and disconnect the
circuit. It normally does not carry current during normal operation.
4.
A circuit has a resistance of 20 ohms and is supplied by 120 volts. Using
Ohm's law, approximately how much current flows through the circuit?
2
,A. 0.17 amperes
B. 6 amperes
C. 20 amperes
D. 2,400 amperes
Answer: B. 6 amperes
Rationale: Ohm's law states I = V/R. Therefore, I = 120/20 = 6
amperes. A helper should be comfortable performing basic electrical
calculations because current, voltage, and resistance are frequently
encountered in electrical work.
5.
Why should an electrical helper inspect extension cords and portable
electrical tools before use?
A. To determine whether the tool is the newest model
B. To increase the operating voltage
C. To identify damaged insulation, grounding problems, or other hazards
D. To determine the manufacturer's recommended color scheme
Answer: C. To identify damaged insulation, grounding problems, or
other hazards
Rationale: Damaged cords, exposed conductors, missing grounding
components, crushed insulation, and defective plugs can create shock,
arc, fire, and equipment hazards. Inspection before use helps prevent
these conditions from becoming incidents.
6.
A series circuit contains three resistors. If one resistor becomes
completely open, what normally happens to the current through the other
series components?
3
, A. Current increases substantially
B. Current becomes zero throughout the series circuit
C. Current remains unchanged
D. Current flows backward through the circuit
Answer: B. Current becomes zero throughout the series circuit
Rationale: A series circuit provides only one continuous path for
current. An open anywhere in that path interrupts the entire circuit, so
current cannot flow through any of the series components.
7.
What is the primary purpose of a circuit breaker?
A. To increase circuit voltage
B. To provide illumination
C. To protect conductors and equipment from excessive current
D. To convert alternating current into direct current
Answer: C. To protect conductors and equipment from excessive
current
Rationale: Circuit breakers are overcurrent protective devices. When
current exceeds the breaker's permitted level under applicable
conditions, the device opens the circuit to help protect wiring and
equipment from overheating and other hazards.
8.
A helper is working near electrical equipment and discovers that a metal
enclosure has become energized because of an insulation failure. Which
condition is MOST directly associated with this hazard?
4
WITH ACTUAL QUESTIONS AND VERIFIED
ANSWERS, PLUS EXPLAINED
RATIONALES/EXPERT VERIFIED FOR
GUARANTEED 100% PASS 2026/LATEST
UPDATE/INSTANT DOWNLOAD PDF
1.
An electrical craft helper is preparing to assist with work on a 480-volt
motor circuit. Before beginning the task, the circuit is identified and the
disconnect is opened. According to proper electrical safety practice,
what is the MOST important next step before treating the circuit as de-
energized?
A. Begin removing the motor junction-box cover
B. Verify absence of voltage using an appropriately rated test instrument
C. Place the motor starter in the OFF position
D. Ask another worker whether the circuit is normally energized
Answer: B. Verify absence of voltage using an appropriately rated
test instrument
Rationale: Opening a disconnect does not by itself prove that a circuit
is de-energized. The circuit must be properly isolated and the absence
of voltage verified with a suitable, properly rated test instrument. This
is a fundamental electrical-safety practice because incorrect
identification, backfeeds, or failed disconnects can leave conductors
energized.
2.
Which unit is used to measure electrical resistance?
1
,A. Ampere
B. Volt
C. Ohm
D. Watt
Answer: C. Ohm
Rationale: Resistance is measured in ohms (Ω). Voltage is measured
in volts, current in amperes, and power in watts. Understanding these
fundamental electrical quantities is essential when assisting
electricians with troubleshooting and installation work.
3.
An electrician asks a helper to identify the conductor intended to provide
a low-resistance path for fault current back to the source. Which
conductor is being described?
A. Equipment grounding conductor
B. Ungrounded conductor
C. Switched conductor
D. Neutral load conductor
Answer: A. Equipment grounding conductor
Rationale: The equipment grounding conductor provides a path for
fault current so that protective devices can operate and disconnect the
circuit. It normally does not carry current during normal operation.
4.
A circuit has a resistance of 20 ohms and is supplied by 120 volts. Using
Ohm's law, approximately how much current flows through the circuit?
2
,A. 0.17 amperes
B. 6 amperes
C. 20 amperes
D. 2,400 amperes
Answer: B. 6 amperes
Rationale: Ohm's law states I = V/R. Therefore, I = 120/20 = 6
amperes. A helper should be comfortable performing basic electrical
calculations because current, voltage, and resistance are frequently
encountered in electrical work.
5.
Why should an electrical helper inspect extension cords and portable
electrical tools before use?
A. To determine whether the tool is the newest model
B. To increase the operating voltage
C. To identify damaged insulation, grounding problems, or other hazards
D. To determine the manufacturer's recommended color scheme
Answer: C. To identify damaged insulation, grounding problems, or
other hazards
Rationale: Damaged cords, exposed conductors, missing grounding
components, crushed insulation, and defective plugs can create shock,
arc, fire, and equipment hazards. Inspection before use helps prevent
these conditions from becoming incidents.
6.
A series circuit contains three resistors. If one resistor becomes
completely open, what normally happens to the current through the other
series components?
3
, A. Current increases substantially
B. Current becomes zero throughout the series circuit
C. Current remains unchanged
D. Current flows backward through the circuit
Answer: B. Current becomes zero throughout the series circuit
Rationale: A series circuit provides only one continuous path for
current. An open anywhere in that path interrupts the entire circuit, so
current cannot flow through any of the series components.
7.
What is the primary purpose of a circuit breaker?
A. To increase circuit voltage
B. To provide illumination
C. To protect conductors and equipment from excessive current
D. To convert alternating current into direct current
Answer: C. To protect conductors and equipment from excessive
current
Rationale: Circuit breakers are overcurrent protective devices. When
current exceeds the breaker's permitted level under applicable
conditions, the device opens the circuit to help protect wiring and
equipment from overheating and other hazards.
8.
A helper is working near electrical equipment and discovers that a metal
enclosure has become energized because of an insulation failure. Which
condition is MOST directly associated with this hazard?
4
