LADWP ELECTRICAL CRAFT HELPER
COMPREHENSIVE PRACTICE EXAM WITH
ACTUAL QUESTIONS AND VERIFIED
ANSWERS, PLUS EXPLAINED
RATIONALES/EXPERT VERIFIED FOR
GUARANTEED 100% PASS 2026/LATEST
UPDATE/INSTANT DOWNLOAD PDF
1. Electrical Safety
A helper is instructed to replace a component inside an electrical
enclosure. The disconnect is switched to OFF, but the helper notices that
no lock or tag has been applied and no verification of the absence of
voltage has been performed. What is the safest course of action?
A. Begin work because the disconnect is visibly in the OFF position
B. Ask another helper whether the circuit is normally energized
C. Treat the circuit as energized until proper isolation, lockout/tagout,
and verification procedures have been completed
D. Wear rubber gloves and proceed without further verification
Answer: C. Treat the circuit as energized until proper isolation,
lockout/tagout, and verification procedures have been completed
Rationale: A disconnect in the OFF position is not, by itself, proof that
an electrical circuit is safe to work on. Proper energy-control
procedures require the energy source to be isolated and controlled,
followed by appropriate verification. PPE is an additional safeguard,
not a substitute for de-energization and verification.
2. Ohm’s Law
1
,A 120-volt circuit supplies a resistive load of 20 ohms. Assuming the
circuit behaves ideally, approximately how much current flows through
the load?
A. 0.167 A
B. 6 A
C. 20 A
D. 2.4 A
Answer: B. 6 A
Rationale: Ohm’s Law states that I = V ÷ R. Therefore, I = 120 V ÷ 20
Ω = 6 A. Recognizing the relationship among voltage, current, and
resistance is fundamental to electrical troubleshooting and
calculations.
3. Electrical Power
A 240-volt heater draws 10 amperes. What is its approximate electrical
power consumption?
A. 24 W
B. 250 W
C. 2,400 W
D. 24,000 W
Answer: C. 2,400 W
Rationale: For a simple resistive load, P = V × I. Thus, P = 240 × 10 =
2,400 watts, or 2.4 kilowatts.
4. Series Circuits
Three resistors of 4 Ω, 6 Ω, and 10 Ω are connected in series. What is
the total resistance?
2
,A. 20 Ω
B. 10 Ω
C. 4 Ω
D. 2.4 Ω
Answer: A. 20 Ω
Rationale: In a series circuit, resistances add directly. Therefore, 4 + 6
+ 10 = 20 Ω. A helper should be able to recognize whether components
are connected in series or parallel before performing calculations.
5. Parallel Circuits
Two identical 20-ohm resistors are connected in parallel. What is the
equivalent resistance?
A. 40 Ω
B. 20 Ω
C. 10 Ω
D. 5 Ω
Answer: C. 10 Ω
Rationale: For two equal resistors in parallel, the equivalent resistance
is one-half the resistance of either resistor: 20 ÷ 2 = 10 Ω. Parallel
resistance is always lower than the smallest individual branch
resistance.
6. Multimeter Use
A worker needs to determine whether approximately 120 volts are
present between two points in an electrical circuit. Which meter function
is normally appropriate?
3
, A. DC amperage
B. AC voltage
C. Resistance with the circuit energized
D. Continuity with the circuit energized
Answer: B. AC voltage
Rationale: A typical building or utility AC circuit requires an
appropriate AC-voltage measurement function. Resistance and
continuity functions generally require the circuit to be de-energized
because the meter supplies its own test current and energized
measurements can damage the instrument or create a hazard.
7. Measuring Resistance
Before using the resistance function of a multimeter on a component, the
preferred condition of the circuit is:
A. Fully energized
B. Connected to a temporary generator
C. De-energized and appropriately isolated
D. Operating at reduced voltage
Answer: C. De-energized and appropriately isolated
Rationale: Resistance measurements are normally performed on de-
energized circuits. Applying external voltage while using an ohmmeter
can produce inaccurate readings, damage the instrument, and expose
the worker to electrical hazards.
8. Current Transformer Safety
A current transformer secondary is being serviced. Why is opening the
secondary circuit of an energized current transformer potentially
dangerous?
4
COMPREHENSIVE PRACTICE EXAM WITH
ACTUAL QUESTIONS AND VERIFIED
ANSWERS, PLUS EXPLAINED
RATIONALES/EXPERT VERIFIED FOR
GUARANTEED 100% PASS 2026/LATEST
UPDATE/INSTANT DOWNLOAD PDF
1. Electrical Safety
A helper is instructed to replace a component inside an electrical
enclosure. The disconnect is switched to OFF, but the helper notices that
no lock or tag has been applied and no verification of the absence of
voltage has been performed. What is the safest course of action?
A. Begin work because the disconnect is visibly in the OFF position
B. Ask another helper whether the circuit is normally energized
C. Treat the circuit as energized until proper isolation, lockout/tagout,
and verification procedures have been completed
D. Wear rubber gloves and proceed without further verification
Answer: C. Treat the circuit as energized until proper isolation,
lockout/tagout, and verification procedures have been completed
Rationale: A disconnect in the OFF position is not, by itself, proof that
an electrical circuit is safe to work on. Proper energy-control
procedures require the energy source to be isolated and controlled,
followed by appropriate verification. PPE is an additional safeguard,
not a substitute for de-energization and verification.
2. Ohm’s Law
1
,A 120-volt circuit supplies a resistive load of 20 ohms. Assuming the
circuit behaves ideally, approximately how much current flows through
the load?
A. 0.167 A
B. 6 A
C. 20 A
D. 2.4 A
Answer: B. 6 A
Rationale: Ohm’s Law states that I = V ÷ R. Therefore, I = 120 V ÷ 20
Ω = 6 A. Recognizing the relationship among voltage, current, and
resistance is fundamental to electrical troubleshooting and
calculations.
3. Electrical Power
A 240-volt heater draws 10 amperes. What is its approximate electrical
power consumption?
A. 24 W
B. 250 W
C. 2,400 W
D. 24,000 W
Answer: C. 2,400 W
Rationale: For a simple resistive load, P = V × I. Thus, P = 240 × 10 =
2,400 watts, or 2.4 kilowatts.
4. Series Circuits
Three resistors of 4 Ω, 6 Ω, and 10 Ω are connected in series. What is
the total resistance?
2
,A. 20 Ω
B. 10 Ω
C. 4 Ω
D. 2.4 Ω
Answer: A. 20 Ω
Rationale: In a series circuit, resistances add directly. Therefore, 4 + 6
+ 10 = 20 Ω. A helper should be able to recognize whether components
are connected in series or parallel before performing calculations.
5. Parallel Circuits
Two identical 20-ohm resistors are connected in parallel. What is the
equivalent resistance?
A. 40 Ω
B. 20 Ω
C. 10 Ω
D. 5 Ω
Answer: C. 10 Ω
Rationale: For two equal resistors in parallel, the equivalent resistance
is one-half the resistance of either resistor: 20 ÷ 2 = 10 Ω. Parallel
resistance is always lower than the smallest individual branch
resistance.
6. Multimeter Use
A worker needs to determine whether approximately 120 volts are
present between two points in an electrical circuit. Which meter function
is normally appropriate?
3
, A. DC amperage
B. AC voltage
C. Resistance with the circuit energized
D. Continuity with the circuit energized
Answer: B. AC voltage
Rationale: A typical building or utility AC circuit requires an
appropriate AC-voltage measurement function. Resistance and
continuity functions generally require the circuit to be de-energized
because the meter supplies its own test current and energized
measurements can damage the instrument or create a hazard.
7. Measuring Resistance
Before using the resistance function of a multimeter on a component, the
preferred condition of the circuit is:
A. Fully energized
B. Connected to a temporary generator
C. De-energized and appropriately isolated
D. Operating at reduced voltage
Answer: C. De-energized and appropriately isolated
Rationale: Resistance measurements are normally performed on de-
energized circuits. Applying external voltage while using an ohmmeter
can produce inaccurate readings, damage the instrument, and expose
the worker to electrical hazards.
8. Current Transformer Safety
A current transformer secondary is being serviced. Why is opening the
secondary circuit of an energized current transformer potentially
dangerous?
4
