LADWP ELECTRICAL CRAFT PRACTICE
EXAMINATION 2026–2027 — STUDY GUIDE | LATEST
UPDATE 2026/2027 | PRACTICE QUESTIONS AND
ANSWERS | EXAM REVIEW | 100% CORRECT
ANSWERS | VERIFIED SOLUTIONS | ALREADY
GRADED A+
This original practice examination is designed for candidates preparing
for the Los Angeles Department of Water and Power (LADWP) Electrical
Craft Helper, Electrical Mechanic, and related electrical craft
examinations. The 100-question test evaluates mastery of basic
electrical theory, safety practices, tools and materials, electrical
measurements, AC/DC circuits, transformers, wiring methods, National
Electrical Code principles, and mathematical problem-solving. Questions
are written at the application and analysis level to mirror the cognitive
complexity of utility electrical craft apprenticeship and pre-employment
examinations. The 2026–2027 edition incorporates current industry
safety standards and electrical fundamentals. Use this comprehensive
review to assess readiness, identify knowledge gaps, and strengthen
your understanding of electrical craft concepts. This is an independent
educational resource, not affiliated with or endorsed by LADWP.
Table of Contents
I. Basic Electrical Theory and Ohm’s Law
II. Electrical Safety and Protective Equipment
III. Tools, Materials, and Wiring Methods
IV. AC/DC Circuits and Transformers
V. Electrical Measurements and Test Instruments
,VI. National Electrical Code and Installation Practices
VII. Mathematics and Problem-Solving for Electrical Craft
1. What is the unit of electrical current?
A) Volt
B) Ampere
C) Ohm
D) Watt
Correct Answer: B
Current is measured in amperes (amps), which represents the flow of
electric charge. Voltage is measured in volts, resistance in ohms, and
power in watts.
2. According to Ohm’s law, what is the current in a circuit with a
voltage of 120 volts and a resistance of 30 ohms?
A) 2 amps
B) 4 amps
C) 6 amps
D) 8 amps
Correct Answer: B
Using Ohm’s law: I = V/R = 120/30 = 4 amps. The other options are
miscalculations.
3. Which of the following materials is the best electrical conductor?
A) Rubber
B) Copper
C) Glass
D) Plastic
,Correct Answer: B
Copper is an excellent conductor with low resistance. Rubber, glass, and
plastic are insulators that resist the flow of electricity.
4. What is the primary purpose of a circuit breaker?
A) To increase current flow
B) To protect a circuit from overload or short circuit
C) To measure voltage
D) To step down voltage
Correct Answer: B
A circuit breaker interrupts current flow when an overload or short
circuit occurs, protecting wiring and equipment from damage. It does
not increase current, measure voltage, or change voltage levels.
5. A 100-watt light bulb operates at 120 volts. What is the current
draw?
A) 0.42 amps
B) 0.83 amps
C) 1.2 amps
D) 2.0 amps
Correct Answer: B
Using the power formula: I = P/V = 100/120 = 0.833 amps. The other
options are miscalculations.
6. Which color wire is typically used for grounding in residential
wiring?
A) Black
B) White
C) Green or bare copper
D) Red
, Correct Answer: C
Ground wires are green or bare copper. Black and red are hot wires,
while white is neutral.
7. What does the term “continuity” mean in an electrical circuit?
A) The circuit is broken
B) There is a complete path for current flow
C) Voltage is zero
D) Resistance is infinite
Correct Answer: B
Continuity means a complete, unbroken path for current to flow. A
broken circuit lacks continuity, showing infinite resistance. Voltage zero
and infinite resistance are not definitions of continuity.
8. Which of the following is a symptom of an overloaded circuit?
A) Dimming lights when a motor starts
B) A circuit breaker tripping repeatedly
C) A slight voltage drop
D) No effect on the circuit
Correct Answer: B
An overloaded circuit draws more current than the breaker rating,
causing it to trip repeatedly. Dimming lights may indicate starting surge;
repeated tripping indicates overload.
9. What is the standard household voltage in the United States?
A) 110/120 volts AC
B) 220/240 volts DC
C) 12 volts AC
D) 480 volts DC
EXAMINATION 2026–2027 — STUDY GUIDE | LATEST
UPDATE 2026/2027 | PRACTICE QUESTIONS AND
ANSWERS | EXAM REVIEW | 100% CORRECT
ANSWERS | VERIFIED SOLUTIONS | ALREADY
GRADED A+
This original practice examination is designed for candidates preparing
for the Los Angeles Department of Water and Power (LADWP) Electrical
Craft Helper, Electrical Mechanic, and related electrical craft
examinations. The 100-question test evaluates mastery of basic
electrical theory, safety practices, tools and materials, electrical
measurements, AC/DC circuits, transformers, wiring methods, National
Electrical Code principles, and mathematical problem-solving. Questions
are written at the application and analysis level to mirror the cognitive
complexity of utility electrical craft apprenticeship and pre-employment
examinations. The 2026–2027 edition incorporates current industry
safety standards and electrical fundamentals. Use this comprehensive
review to assess readiness, identify knowledge gaps, and strengthen
your understanding of electrical craft concepts. This is an independent
educational resource, not affiliated with or endorsed by LADWP.
Table of Contents
I. Basic Electrical Theory and Ohm’s Law
II. Electrical Safety and Protective Equipment
III. Tools, Materials, and Wiring Methods
IV. AC/DC Circuits and Transformers
V. Electrical Measurements and Test Instruments
,VI. National Electrical Code and Installation Practices
VII. Mathematics and Problem-Solving for Electrical Craft
1. What is the unit of electrical current?
A) Volt
B) Ampere
C) Ohm
D) Watt
Correct Answer: B
Current is measured in amperes (amps), which represents the flow of
electric charge. Voltage is measured in volts, resistance in ohms, and
power in watts.
2. According to Ohm’s law, what is the current in a circuit with a
voltage of 120 volts and a resistance of 30 ohms?
A) 2 amps
B) 4 amps
C) 6 amps
D) 8 amps
Correct Answer: B
Using Ohm’s law: I = V/R = 120/30 = 4 amps. The other options are
miscalculations.
3. Which of the following materials is the best electrical conductor?
A) Rubber
B) Copper
C) Glass
D) Plastic
,Correct Answer: B
Copper is an excellent conductor with low resistance. Rubber, glass, and
plastic are insulators that resist the flow of electricity.
4. What is the primary purpose of a circuit breaker?
A) To increase current flow
B) To protect a circuit from overload or short circuit
C) To measure voltage
D) To step down voltage
Correct Answer: B
A circuit breaker interrupts current flow when an overload or short
circuit occurs, protecting wiring and equipment from damage. It does
not increase current, measure voltage, or change voltage levels.
5. A 100-watt light bulb operates at 120 volts. What is the current
draw?
A) 0.42 amps
B) 0.83 amps
C) 1.2 amps
D) 2.0 amps
Correct Answer: B
Using the power formula: I = P/V = 100/120 = 0.833 amps. The other
options are miscalculations.
6. Which color wire is typically used for grounding in residential
wiring?
A) Black
B) White
C) Green or bare copper
D) Red
, Correct Answer: C
Ground wires are green or bare copper. Black and red are hot wires,
while white is neutral.
7. What does the term “continuity” mean in an electrical circuit?
A) The circuit is broken
B) There is a complete path for current flow
C) Voltage is zero
D) Resistance is infinite
Correct Answer: B
Continuity means a complete, unbroken path for current to flow. A
broken circuit lacks continuity, showing infinite resistance. Voltage zero
and infinite resistance are not definitions of continuity.
8. Which of the following is a symptom of an overloaded circuit?
A) Dimming lights when a motor starts
B) A circuit breaker tripping repeatedly
C) A slight voltage drop
D) No effect on the circuit
Correct Answer: B
An overloaded circuit draws more current than the breaker rating,
causing it to trip repeatedly. Dimming lights may indicate starting surge;
repeated tripping indicates overload.
9. What is the standard household voltage in the United States?
A) 110/120 volts AC
B) 220/240 volts DC
C) 12 volts AC
D) 480 volts DC
