LADWP Electrical Craft Helper Ultimate Exam
**Question 1. What is the unit of electric resistance?**
A) Volt
B) Ampere
C) Ohm
D) Watt
Answer: C
Explanation: Resistance is measured in ohms (Ω), defined by Ohm’s Law as V = I·R.
**Question 2. Which material is the best conductor of electricity?**
A) Aluminum
B) Copper
C) Steel
D) PVC
Answer: B
Explanation: Copper has the highest conductivity among common wiring materials, surpassing aluminum
and far exceeding non-conductors like steel or PVC.
**Question 3. In a series circuit, if one component fails open, the entire circuit:**
A) Continues to operate at reduced voltage
B) Remains fully functional
C) Loses all voltage across each component
D) Stops current flow completely
Answer: D
Explanation: An open in a series path breaks the single continuous loop, halting current flow throughout
the circuit.
, LADWP Electrical Craft Helper Ultimate Exam
**Question 4. The standard frequency of AC power supplied in the United States is:**
A) 25 Hz
B) 50 Hz
C) 60 Hz
D) 100 Hz
Answer: C
Explanation: U.S. utility grids operate at 60 hertz, whereas many other countries use 50 Hz.
**Question 5. Which tool is specifically designed for cutting copper conduit?**
A) Hacksaw
B) Bolt cutter
C) Conduit cutter
D) Pipe wrench
Answer: C
Explanation: A conduit cutter provides clean, straight cuts on EMT, RMC, and PVC conduit, unlike
general-purpose saws or cutters.
**Question 6. When using a multimeter to measure voltage, the meter should be set to:**
A) Resistance (Ω) mode
B) Current (A) mode
C) Voltage (V) mode
D) Continuity mode
Answer: C
, LADWP Electrical Craft Helper Ultimate Exam
Explanation: Voltage measurements require the multimeter to be in the voltage setting; using other
modes can damage the instrument or give incorrect readings.
**Question 7. Which color is used for grounding conductors in most U.S. wiring?**
A) White
B) Red
C) Black
D) Green or bare
Answer: D
Explanation: Grounding conductors are typically green insulated or bare copper to distinguish them from
hot (black/red) and neutral (white) wires.
**Question 8. The primary purpose of a lockout/tagout (LOTO) procedure is to:**
A) Reduce noise on the job site
B) Prevent accidental energization of equipment
C) Ensure tools are properly calibrated
D) Keep inventory organized
Answer: B
Explanation: LOTO isolates energy sources and locks equipment to protect workers from unexpected
start-up or release of stored energy.
**Question 9. A megger is used to test:**
A) Voltage levels on live circuits
B) Insulation resistance of conductors
C) Continuity of a breaker
D) Current draw of a motor
, LADWP Electrical Craft Helper Ultimate Exam
Answer: B
Explanation: A megger applies a high voltage to measure the resistance of insulation, detecting
degradation or faults.
**Question 10. Which of the following is a characteristic of a parallel circuit?**
A) Same current flows through each component
B) Voltage across each branch is the same
C) Total resistance is the sum of individual resistances
D) A single open component breaks the circuit
Answer: B
Explanation: In parallel, each branch experiences the full source voltage, while the total current is the
sum of branch currents.
**Question 11. The correct order of steps for safely removing a fuse is:**
A) Verify voltage, remove fuse, replace with new fuse
B) Remove fuse first, then verify voltage, then replace
C) Verify voltage is zero, remove fuse, label and store safely
D) Label fuse, remove, then test voltage
Answer: C
Explanation: Ensuring the circuit is de-energized (zero voltage) prevents shock before handling the fuse.
**Question 12. Which hand tool is best for bending small gauge wire?**
A) Needle-nose pliers
B) Channel-lock pliers
C) Linesman pliers
**Question 1. What is the unit of electric resistance?**
A) Volt
B) Ampere
C) Ohm
D) Watt
Answer: C
Explanation: Resistance is measured in ohms (Ω), defined by Ohm’s Law as V = I·R.
**Question 2. Which material is the best conductor of electricity?**
A) Aluminum
B) Copper
C) Steel
D) PVC
Answer: B
Explanation: Copper has the highest conductivity among common wiring materials, surpassing aluminum
and far exceeding non-conductors like steel or PVC.
**Question 3. In a series circuit, if one component fails open, the entire circuit:**
A) Continues to operate at reduced voltage
B) Remains fully functional
C) Loses all voltage across each component
D) Stops current flow completely
Answer: D
Explanation: An open in a series path breaks the single continuous loop, halting current flow throughout
the circuit.
, LADWP Electrical Craft Helper Ultimate Exam
**Question 4. The standard frequency of AC power supplied in the United States is:**
A) 25 Hz
B) 50 Hz
C) 60 Hz
D) 100 Hz
Answer: C
Explanation: U.S. utility grids operate at 60 hertz, whereas many other countries use 50 Hz.
**Question 5. Which tool is specifically designed for cutting copper conduit?**
A) Hacksaw
B) Bolt cutter
C) Conduit cutter
D) Pipe wrench
Answer: C
Explanation: A conduit cutter provides clean, straight cuts on EMT, RMC, and PVC conduit, unlike
general-purpose saws or cutters.
**Question 6. When using a multimeter to measure voltage, the meter should be set to:**
A) Resistance (Ω) mode
B) Current (A) mode
C) Voltage (V) mode
D) Continuity mode
Answer: C
, LADWP Electrical Craft Helper Ultimate Exam
Explanation: Voltage measurements require the multimeter to be in the voltage setting; using other
modes can damage the instrument or give incorrect readings.
**Question 7. Which color is used for grounding conductors in most U.S. wiring?**
A) White
B) Red
C) Black
D) Green or bare
Answer: D
Explanation: Grounding conductors are typically green insulated or bare copper to distinguish them from
hot (black/red) and neutral (white) wires.
**Question 8. The primary purpose of a lockout/tagout (LOTO) procedure is to:**
A) Reduce noise on the job site
B) Prevent accidental energization of equipment
C) Ensure tools are properly calibrated
D) Keep inventory organized
Answer: B
Explanation: LOTO isolates energy sources and locks equipment to protect workers from unexpected
start-up or release of stored energy.
**Question 9. A megger is used to test:**
A) Voltage levels on live circuits
B) Insulation resistance of conductors
C) Continuity of a breaker
D) Current draw of a motor
, LADWP Electrical Craft Helper Ultimate Exam
Answer: B
Explanation: A megger applies a high voltage to measure the resistance of insulation, detecting
degradation or faults.
**Question 10. Which of the following is a characteristic of a parallel circuit?**
A) Same current flows through each component
B) Voltage across each branch is the same
C) Total resistance is the sum of individual resistances
D) A single open component breaks the circuit
Answer: B
Explanation: In parallel, each branch experiences the full source voltage, while the total current is the
sum of branch currents.
**Question 11. The correct order of steps for safely removing a fuse is:**
A) Verify voltage, remove fuse, replace with new fuse
B) Remove fuse first, then verify voltage, then replace
C) Verify voltage is zero, remove fuse, label and store safely
D) Label fuse, remove, then test voltage
Answer: C
Explanation: Ensuring the circuit is de-energized (zero voltage) prevents shock before handling the fuse.
**Question 12. Which hand tool is best for bending small gauge wire?**
A) Needle-nose pliers
B) Channel-lock pliers
C) Linesman pliers
