LOS ANGELES DEPARTMENT OF WATER AND POWER (LADWP) ELECTRICAL CRAFT HELPER (CLASSCODE 3799)
EXAM – QUESTIONS AND ANSWERS | VERIFIED AND WELL DETAILED ANSWERS | PLUS RATIONALES |
DOWNLOAD AND PASS | LATEST EXAM UPDATE 2026/2027
Core Domains
Electrical Fundamentals and Theory
Safety Procedures and PPE
Hand and Power Tools
Mathematics and Calculations
Mechanical Aptitude and Rigging
Materials and Construction Practices
Situational Judgment and Decision-Making
Regulatory Compliance and Standards
Introduction
This examination is designed to assess the foundational knowledge and practical aptitude required for the entry-level
Electrical Craft Helper classification. Candidates are evaluated on essential skills including electrical theory, workplace
safety protocols, proper tool usage, basic mathematics, and mechanical reasoning. The assessment utilizes multiple-
,choice and scenario-based questions to simulate real-world job tasks and decision-making challenges. Emphasis is
placed on the application of knowledge in field settings, ensuring candidates possess the critical thinking abilities
necessary to assist journey-level workers effectively while maintaining a safe and productive work environment.
SECTION ONE: QUESTIONS 1 – 50
1. What is the standard unit of measurement for electrical resistance?
A. Volt
B. Ampere
C. Ohm
D. Watt
🟢 Correct Answer: C. Ohm
🔴 Explanation: The ohm (Ω) is the unit of electrical resistance, representing the opposition to the flow of electric
current. Voltage is measured in volts, current in amperes, and power in watts.
2. According to Ohm's Law, what is the formula for calculating voltage?
A. Voltage = Current ÷ Resistance
B. Voltage = Current × Resistance
,C. Voltage = Resistance ÷ Current
D. Voltage = Power × Current
🟢 Correct Answer: B. Voltage = Current × Resistance
🔴 Explanation: Ohm's Law states that voltage (V) equals current (I) multiplied by resistance (R), expressed as V = I ×
R. This fundamental relationship is essential for analyzing electrical circuits.
3. What is the total resistance of three 12-ohm resistors connected in series?
A. 4 ohms
B. 12 ohms
C. 24 ohms
D. 36 ohms
🟢 Correct Answer: D. 36 ohms
🔴 Explanation: In a series circuit, total resistance is the sum of all individual resistances. Therefore, 12Ω + 12Ω +
12Ω = 36Ω.
4. What is the total resistance of two 8-ohm resistors connected in parallel?
, A. 4 ohms
B. 8 ohms
C. 16 ohms
D. 64 ohms
🟢 Correct Answer: A. 4 ohms
🔴 Explanation: For two equal resistors in parallel, total resistance equals the resistance value divided by two.
Therefore, 8Ω ÷ 2 = 4Ω.
5. What is the standard frequency of alternating current in North America?
A. 25 Hz
B. 50 Hz
C. 60 Hz
D. 100 Hz
🟢 Correct Answer: C. 60 Hz
🔴 Explanation: The standard AC frequency in North America is 60 cycles per second, or 60 Hz. This differs from the
50 Hz standard used in many other parts of the world.
6. What is the primary purpose of a ground wire on a power line?
EXAM – QUESTIONS AND ANSWERS | VERIFIED AND WELL DETAILED ANSWERS | PLUS RATIONALES |
DOWNLOAD AND PASS | LATEST EXAM UPDATE 2026/2027
Core Domains
Electrical Fundamentals and Theory
Safety Procedures and PPE
Hand and Power Tools
Mathematics and Calculations
Mechanical Aptitude and Rigging
Materials and Construction Practices
Situational Judgment and Decision-Making
Regulatory Compliance and Standards
Introduction
This examination is designed to assess the foundational knowledge and practical aptitude required for the entry-level
Electrical Craft Helper classification. Candidates are evaluated on essential skills including electrical theory, workplace
safety protocols, proper tool usage, basic mathematics, and mechanical reasoning. The assessment utilizes multiple-
,choice and scenario-based questions to simulate real-world job tasks and decision-making challenges. Emphasis is
placed on the application of knowledge in field settings, ensuring candidates possess the critical thinking abilities
necessary to assist journey-level workers effectively while maintaining a safe and productive work environment.
SECTION ONE: QUESTIONS 1 – 50
1. What is the standard unit of measurement for electrical resistance?
A. Volt
B. Ampere
C. Ohm
D. Watt
🟢 Correct Answer: C. Ohm
🔴 Explanation: The ohm (Ω) is the unit of electrical resistance, representing the opposition to the flow of electric
current. Voltage is measured in volts, current in amperes, and power in watts.
2. According to Ohm's Law, what is the formula for calculating voltage?
A. Voltage = Current ÷ Resistance
B. Voltage = Current × Resistance
,C. Voltage = Resistance ÷ Current
D. Voltage = Power × Current
🟢 Correct Answer: B. Voltage = Current × Resistance
🔴 Explanation: Ohm's Law states that voltage (V) equals current (I) multiplied by resistance (R), expressed as V = I ×
R. This fundamental relationship is essential for analyzing electrical circuits.
3. What is the total resistance of three 12-ohm resistors connected in series?
A. 4 ohms
B. 12 ohms
C. 24 ohms
D. 36 ohms
🟢 Correct Answer: D. 36 ohms
🔴 Explanation: In a series circuit, total resistance is the sum of all individual resistances. Therefore, 12Ω + 12Ω +
12Ω = 36Ω.
4. What is the total resistance of two 8-ohm resistors connected in parallel?
, A. 4 ohms
B. 8 ohms
C. 16 ohms
D. 64 ohms
🟢 Correct Answer: A. 4 ohms
🔴 Explanation: For two equal resistors in parallel, total resistance equals the resistance value divided by two.
Therefore, 8Ω ÷ 2 = 4Ω.
5. What is the standard frequency of alternating current in North America?
A. 25 Hz
B. 50 Hz
C. 60 Hz
D. 100 Hz
🟢 Correct Answer: C. 60 Hz
🔴 Explanation: The standard AC frequency in North America is 60 cycles per second, or 60 Hz. This differs from the
50 Hz standard used in many other parts of the world.
6. What is the primary purpose of a ground wire on a power line?
