LADWP ELECTRICAL CRAFT HELPER EXAM 2026/2027 –
300 QUESTIONS, VERIFIED ANSWERS & DETAILED
RATIONALES GUARANTEED PASS
Question 1
A 120-volt branch circuit supplies a lighting load drawing 8 amperes. If
the circuit conductors have negligible voltage drop and the load operates
continuously, what is the approximate electrical power consumed by the
load?
A. 15 W
B. 120 W
C. 960 W
D. 1,440 W
Correct Answer: C. 960 W
Rationale: Electrical power is calculated using P = V × I. Therefore,
120 V × 8 A = 960 W. The other values do not result from multiplying
the given voltage and current.
Question 2
An electrical craft helper is preparing to work on equipment that may
contain energized conductors. The disconnecting means is identified, but
the helper cannot visually confirm that the circuit is de-energized. What
is the safest procedure before beginning work?
A. Assume the circuit is de-energized because the disconnect is labeled
B. Touch the conductor briefly with an insulated tool to check for
voltage
C. Verify the absence of voltage using an appropriate test instrument
,after following required isolation procedures
D. Remove the equipment grounding conductor before testing
Correct Answer: C. Verify the absence of voltage using an
appropriate test instrument after following required isolation
procedures
Rationale: Electrical circuits must not be assumed safe merely because
a disconnect is labeled or operated. Appropriate isolation and
verification with a properly rated test instrument are fundamental
electrical-safety practices. Contacting a conductor with a tool or
removing the grounding conductor can create additional hazards.
Question 3
A copper conductor has an insulation marking that indicates it is rated
for use at temperatures up to 90°C under specified conditions. Which
statement best describes the significance of this rating?
A. The conductor must always operate continuously at 90°C
B. The insulation system has a specified maximum temperature rating
under applicable conditions
C. The conductor can safely carry any amount of current below 90°C
D. The conductor is automatically rated for outdoor burial
Correct Answer: B. The insulation system has a specified maximum
temperature rating under applicable conditions
Rationale: The temperature designation primarily identifies the
conductor insulation's allowable temperature rating under the conditions
established by the applicable electrical requirements. It does not mean
the conductor can carry unlimited current or that it is automatically
suitable for every installation environment.
,Question 4
A helper is using a digital multimeter to determine whether a circuit
contains approximately 120 volts AC. Which meter function should
normally be selected?
A. DC amperage
B. AC voltage
C. Resistance
D. Continuity only
Correct Answer: B. AC voltage
Rationale: A typical 120-volt building circuit is an AC voltage source,
so the meter must be configured for an appropriate AC-voltage
measurement. Resistance and continuity functions are intended for de-
energized circuits and should not be used to measure energized line
voltage.
Question 5
Two resistors rated at 10 Ω and 20 Ω are connected in series. What is
their equivalent resistance?
A. 5 Ω
B. 10 Ω
C. 20 Ω
D. 30 Ω
Correct Answer: D. 30 Ω
Rationale: For resistors connected in series, the resistances add:
10 Ω + 20 Ω = 30 Ω
, The equivalent resistance of a series circuit is therefore greater than
either individual resistance.
Question 6
A circuit breaker repeatedly trips shortly after a motor is started. Before
replacing the breaker with one having a higher ampere rating, what
should the electrical worker do?
A. Install the larger breaker immediately
B. Determine the cause of the overcurrent condition
C. Bypass the breaker temporarily
D. Remove the equipment grounding conductor
Correct Answer: B. Determine the cause of the overcurrent
condition
Rationale: Repeated tripping is an indication that a problem may exist,
such as excessive load, a fault, motor-related starting conditions, wiring
problems, or equipment malfunction. Installing a larger breaker without
determining whether the circuit and conductors are designed for the
higher rating can create a serious fire and shock hazard.
Question 7
A 24-volt control circuit draws 2 amperes. What is the circuit's
approximate resistance according to Ohm's law?
A. 12 Ω
B. 22 Ω
C. 26 Ω
D. 48 Ω
300 QUESTIONS, VERIFIED ANSWERS & DETAILED
RATIONALES GUARANTEED PASS
Question 1
A 120-volt branch circuit supplies a lighting load drawing 8 amperes. If
the circuit conductors have negligible voltage drop and the load operates
continuously, what is the approximate electrical power consumed by the
load?
A. 15 W
B. 120 W
C. 960 W
D. 1,440 W
Correct Answer: C. 960 W
Rationale: Electrical power is calculated using P = V × I. Therefore,
120 V × 8 A = 960 W. The other values do not result from multiplying
the given voltage and current.
Question 2
An electrical craft helper is preparing to work on equipment that may
contain energized conductors. The disconnecting means is identified, but
the helper cannot visually confirm that the circuit is de-energized. What
is the safest procedure before beginning work?
A. Assume the circuit is de-energized because the disconnect is labeled
B. Touch the conductor briefly with an insulated tool to check for
voltage
C. Verify the absence of voltage using an appropriate test instrument
,after following required isolation procedures
D. Remove the equipment grounding conductor before testing
Correct Answer: C. Verify the absence of voltage using an
appropriate test instrument after following required isolation
procedures
Rationale: Electrical circuits must not be assumed safe merely because
a disconnect is labeled or operated. Appropriate isolation and
verification with a properly rated test instrument are fundamental
electrical-safety practices. Contacting a conductor with a tool or
removing the grounding conductor can create additional hazards.
Question 3
A copper conductor has an insulation marking that indicates it is rated
for use at temperatures up to 90°C under specified conditions. Which
statement best describes the significance of this rating?
A. The conductor must always operate continuously at 90°C
B. The insulation system has a specified maximum temperature rating
under applicable conditions
C. The conductor can safely carry any amount of current below 90°C
D. The conductor is automatically rated for outdoor burial
Correct Answer: B. The insulation system has a specified maximum
temperature rating under applicable conditions
Rationale: The temperature designation primarily identifies the
conductor insulation's allowable temperature rating under the conditions
established by the applicable electrical requirements. It does not mean
the conductor can carry unlimited current or that it is automatically
suitable for every installation environment.
,Question 4
A helper is using a digital multimeter to determine whether a circuit
contains approximately 120 volts AC. Which meter function should
normally be selected?
A. DC amperage
B. AC voltage
C. Resistance
D. Continuity only
Correct Answer: B. AC voltage
Rationale: A typical 120-volt building circuit is an AC voltage source,
so the meter must be configured for an appropriate AC-voltage
measurement. Resistance and continuity functions are intended for de-
energized circuits and should not be used to measure energized line
voltage.
Question 5
Two resistors rated at 10 Ω and 20 Ω are connected in series. What is
their equivalent resistance?
A. 5 Ω
B. 10 Ω
C. 20 Ω
D. 30 Ω
Correct Answer: D. 30 Ω
Rationale: For resistors connected in series, the resistances add:
10 Ω + 20 Ω = 30 Ω
, The equivalent resistance of a series circuit is therefore greater than
either individual resistance.
Question 6
A circuit breaker repeatedly trips shortly after a motor is started. Before
replacing the breaker with one having a higher ampere rating, what
should the electrical worker do?
A. Install the larger breaker immediately
B. Determine the cause of the overcurrent condition
C. Bypass the breaker temporarily
D. Remove the equipment grounding conductor
Correct Answer: B. Determine the cause of the overcurrent
condition
Rationale: Repeated tripping is an indication that a problem may exist,
such as excessive load, a fault, motor-related starting conditions, wiring
problems, or equipment malfunction. Installing a larger breaker without
determining whether the circuit and conductors are designed for the
higher rating can create a serious fire and shock hazard.
Question 7
A 24-volt control circuit draws 2 amperes. What is the circuit's
approximate resistance according to Ohm's law?
A. 12 Ω
B. 22 Ω
C. 26 Ω
D. 48 Ω
