LOS ANGELES DEPARTMENT OF WATER AND POWER
(LADWP) ELECTRICAL CRAFT HELPER EXAM 2026/2027
PRACTICE QUESTIONS AND CURRENTLY UPDATED STUDY
GUIDE ACCURATE EXAM COMPLETE ACTUAL QUESTIONS
WITH WELL ELABORATED ANSWERS AND DETAILED
RATIONALES (100% CORRECT VERIFIED ANSWERS)
NEWEST UPDATED VERSION 2026 EDITION |GUARANTEED
PASS A+ |JUST RELEASED
1. What is the unit of electric resistance?
A) Volt
B) Ampere
C) Ohm
D) Watt
Correct Answer: C
Rationale: Resistance is measured in ohms (Ω), as defined by
Ohm's Law (V = I × R). Volts measure electromotive force,
amperes measure current, and watts measure power.
2. Which material is the best conductor of electricity among
common wiring materials?
A) Aluminum
B) Copper
,C) Steel
D) PVC
Correct Answer: B
Rationale: Copper has the highest conductivity among common
wiring materials, surpassing aluminum and far exceeding non-
conductors like steel or PVC. Copper's excellent conductivity,
ductility, and resistance to corrosion make it the preferred
material for electrical wiring in utility and construction
applications.
3. The standard frequency of AC power supplied in the United States
is:
A) 50 Hz
B) 60 Hz
C) 100 Hz
D) 120 Hz
Correct Answer: B
Rationale: The standard frequency for alternating current (AC)
power in the United States is 60 Hz (cycles per second).
,4. What is the total resistance of two 10-ohm resistors connected in
series?
A) 5 ohms
B) 10 ohms
C) 20 ohms
D) 100 ohms
Correct Answer: C
Rationale: In a series circuit, total resistance is the sum of
individual resistances: R_total = R₁ + R₂ = 10 + 10 = 20 ohms.
5. What is the total resistance of two 10-ohm resistors connected in
parallel?
A) 5 ohms
B) 10 ohms
C) 15 ohms
D) 20 ohms
Correct Answer: A
Rationale: In a parallel circuit, total resistance is calculated as
1/R_total = 1/R₁ + 1/R₂. For two 10-ohm resistors: 1/R_total =
1/10 + 1/10 = 2/10, so R_total = 5 ohms.
, 6. An electrical circuit has a resistance of 12 ohms and is connected
to a 120-volt source. Using Ohm's law, approximately how much
current should flow?
A) 0.1 A
B) 10 A
C) 120 A
D) 1,440 A
Correct Answer: B
Rationale: Ohm's law states I = V/R. Therefore, 120 volts ÷ 12
ohms = 10 amperes. Understanding this relationship helps a helper
recognize whether measured current is reasonable for a circuit.
7. Which instrument is specifically intended to measure electrical
current in a circuit?
A) Ammeter
B) Voltmeter
C) Megohmmeter
D) Ohmmeter
Correct Answer: A
Rationale: An ammeter measures current, normally in amperes. A
voltmeter measures potential difference, an ohmmeter measures
(LADWP) ELECTRICAL CRAFT HELPER EXAM 2026/2027
PRACTICE QUESTIONS AND CURRENTLY UPDATED STUDY
GUIDE ACCURATE EXAM COMPLETE ACTUAL QUESTIONS
WITH WELL ELABORATED ANSWERS AND DETAILED
RATIONALES (100% CORRECT VERIFIED ANSWERS)
NEWEST UPDATED VERSION 2026 EDITION |GUARANTEED
PASS A+ |JUST RELEASED
1. What is the unit of electric resistance?
A) Volt
B) Ampere
C) Ohm
D) Watt
Correct Answer: C
Rationale: Resistance is measured in ohms (Ω), as defined by
Ohm's Law (V = I × R). Volts measure electromotive force,
amperes measure current, and watts measure power.
2. Which material is the best conductor of electricity among
common wiring materials?
A) Aluminum
B) Copper
,C) Steel
D) PVC
Correct Answer: B
Rationale: Copper has the highest conductivity among common
wiring materials, surpassing aluminum and far exceeding non-
conductors like steel or PVC. Copper's excellent conductivity,
ductility, and resistance to corrosion make it the preferred
material for electrical wiring in utility and construction
applications.
3. The standard frequency of AC power supplied in the United States
is:
A) 50 Hz
B) 60 Hz
C) 100 Hz
D) 120 Hz
Correct Answer: B
Rationale: The standard frequency for alternating current (AC)
power in the United States is 60 Hz (cycles per second).
,4. What is the total resistance of two 10-ohm resistors connected in
series?
A) 5 ohms
B) 10 ohms
C) 20 ohms
D) 100 ohms
Correct Answer: C
Rationale: In a series circuit, total resistance is the sum of
individual resistances: R_total = R₁ + R₂ = 10 + 10 = 20 ohms.
5. What is the total resistance of two 10-ohm resistors connected in
parallel?
A) 5 ohms
B) 10 ohms
C) 15 ohms
D) 20 ohms
Correct Answer: A
Rationale: In a parallel circuit, total resistance is calculated as
1/R_total = 1/R₁ + 1/R₂. For two 10-ohm resistors: 1/R_total =
1/10 + 1/10 = 2/10, so R_total = 5 ohms.
, 6. An electrical circuit has a resistance of 12 ohms and is connected
to a 120-volt source. Using Ohm's law, approximately how much
current should flow?
A) 0.1 A
B) 10 A
C) 120 A
D) 1,440 A
Correct Answer: B
Rationale: Ohm's law states I = V/R. Therefore, 120 volts ÷ 12
ohms = 10 amperes. Understanding this relationship helps a helper
recognize whether measured current is reasonable for a circuit.
7. Which instrument is specifically intended to measure electrical
current in a circuit?
A) Ammeter
B) Voltmeter
C) Megohmmeter
D) Ohmmeter
Correct Answer: A
Rationale: An ammeter measures current, normally in amperes. A
voltmeter measures potential difference, an ohmmeter measures
