LADWP ELECTRICAL CRAFT HELPER EXAM 2026/2027 –
PRACTICE QUESTIONS with VERIFIED ANSWERS &
DETAILED RATIONALES [GUARANTEED PASS!]
LADWP ELECTRICAL CRAFT HELPER EXAM – PRACTICE
QUESTIONS (2026)
Section 1: Electrical Fundamentals & Ohm's Law
1. What is the primary purpose of lockout/tagout when electrical equipment is
being serviced?
A) To increase productivity
B) To prevent unexpected energization
C) To reduce electricity costs
D) To test circuit breakers
Answer: B) To prevent unexpected energization
Rationale: Lockout/tagout prevents unexpected energization while workers
perform maintenance or repair.
What is the unit of electric resistance?
A) Volt
B) Ampere
C) Ohm
D) Watt
Answer: C) Ohm
Rationale: Resistance is measured in ohms (Ω), defined by Ohm's Law as V = I ×
, R. Volts measure electromotive force, amperes measure current, and watts measure
power.
2. According to Ohm's law, if voltage is 120 V and resistance is 20 Ω, what is
the current?
A) 2 A
B) 4 A
C) 6 A
D) 20 A
Answer: C) 6 A
Rationale: Ohm's law is I = V/R. Therefore, 120 ÷ 20 = 6 amperes.
3. What does a voltmeter measure?
A) Current
B) Resistance only
C) Voltage
D) Mechanical force
Answer: C) Voltage
Rationale: A voltmeter measures electrical potential difference, expressed in volts.
4. What does an ammeter measure?
A) Current
B) Voltage
C) Resistance
D) Power factor only
, Answer: A) Current
Rationale: An ammeter measures electrical current, expressed in amperes.
5. Which instrument is commonly used to measure resistance?
A) Ohmmeter
B) Ammeter
C) Tachometer
D) Thermometer
Answer: A) Ohmmeter
Rationale: Resistance is measured in ohms using an ohmmeter or the resistance
function of a multimeter.
6. If a circuit has 10 A of current and 12 V of voltage, what is its power?
A) 22 W
B) 120 W
C) 1.2 W
D) 1200 W
Answer: B) 120 W
Rationale: Power = Voltage × Current (P = V × I). Therefore, 12 × 10 = 120
watts.
7. Which electrical quantity describes the opposition that a material presents
to the flow of electric current?
A) Voltage
B) Resistance
C) Power
D) Frequency
PRACTICE QUESTIONS with VERIFIED ANSWERS &
DETAILED RATIONALES [GUARANTEED PASS!]
LADWP ELECTRICAL CRAFT HELPER EXAM – PRACTICE
QUESTIONS (2026)
Section 1: Electrical Fundamentals & Ohm's Law
1. What is the primary purpose of lockout/tagout when electrical equipment is
being serviced?
A) To increase productivity
B) To prevent unexpected energization
C) To reduce electricity costs
D) To test circuit breakers
Answer: B) To prevent unexpected energization
Rationale: Lockout/tagout prevents unexpected energization while workers
perform maintenance or repair.
What is the unit of electric resistance?
A) Volt
B) Ampere
C) Ohm
D) Watt
Answer: C) Ohm
Rationale: Resistance is measured in ohms (Ω), defined by Ohm's Law as V = I ×
, R. Volts measure electromotive force, amperes measure current, and watts measure
power.
2. According to Ohm's law, if voltage is 120 V and resistance is 20 Ω, what is
the current?
A) 2 A
B) 4 A
C) 6 A
D) 20 A
Answer: C) 6 A
Rationale: Ohm's law is I = V/R. Therefore, 120 ÷ 20 = 6 amperes.
3. What does a voltmeter measure?
A) Current
B) Resistance only
C) Voltage
D) Mechanical force
Answer: C) Voltage
Rationale: A voltmeter measures electrical potential difference, expressed in volts.
4. What does an ammeter measure?
A) Current
B) Voltage
C) Resistance
D) Power factor only
, Answer: A) Current
Rationale: An ammeter measures electrical current, expressed in amperes.
5. Which instrument is commonly used to measure resistance?
A) Ohmmeter
B) Ammeter
C) Tachometer
D) Thermometer
Answer: A) Ohmmeter
Rationale: Resistance is measured in ohms using an ohmmeter or the resistance
function of a multimeter.
6. If a circuit has 10 A of current and 12 V of voltage, what is its power?
A) 22 W
B) 120 W
C) 1.2 W
D) 1200 W
Answer: B) 120 W
Rationale: Power = Voltage × Current (P = V × I). Therefore, 12 × 10 = 120
watts.
7. Which electrical quantity describes the opposition that a material presents
to the flow of electric current?
A) Voltage
B) Resistance
C) Power
D) Frequency
