LADWP Electrical Craft Helper Exam
Questions And Correct Answers
(Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. What is the primary purpose of personal protective equipment
(PPE) when performing electrical work?
A. To make the work faster
B. To eliminate the need for safe work practices
C. To reduce the worker’s exposure to hazards
D. To replace electrical training
Answer: C. To reduce the worker’s exposure to hazards
Rationale: PPE provides a layer of protection against hazards such as
electrical shock, arc flash, flying particles, burns, and other workplace
dangers. PPE does not eliminate the hazard and must be used together
with appropriate procedures, training, and hazard controls.
2. Which unit is used to measure electrical current?
A. Ohm
B. Volt
C. Watt
D. Ampere
Answer: D. Ampere
,Rationale: Electrical current is measured in amperes, commonly
called amps. Voltage measures electrical potential difference,
resistance is measured in ohms, and power is commonly measured in
watts.
3. What instrument is normally used to measure voltage?
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Watt-hour meter
Answer: A. Voltmeter
Rationale: A voltmeter measures the potential difference between two
points. It is connected across the portion of the circuit being tested
rather than placed in series like an ammeter.
4. According to Ohm’s law, voltage is equal to:
A. Current divided by resistance
B. Resistance divided by current
C. Current multiplied by resistance
D. Power multiplied by resistance
Answer: C. Current multiplied by resistance
Rationale: Ohm’s law is V = I × R. Voltage equals current multiplied
by resistance. This relationship is fundamental to understanding and
calculating basic electrical circuits.
,5. Which condition presents the greatest immediate danger when
working near energized electrical equipment?
A. A dirty tool
B. Unexpected contact with an energized conductor
C. A loose paper document
D. Low ambient lighting
Answer: B. Unexpected contact with an energized conductor
Rationale: Contact with energized conductors can result in severe
shock, burns, arc flash, or fatal injury. Electrical workers must
identify sources of energy and follow required safe-work procedures
before approaching or handling electrical equipment.
6. What does resistance oppose in an electrical circuit?
A. Voltage
B. Power
C. Current flow
D. Frequency
Answer: C. Current flow
Rationale: Electrical resistance opposes the movement of electric
charge. For a given voltage, increasing resistance generally decreases
current according to Ohm’s law.
7. Which material is generally considered a good electrical
conductor?
A. Rubber
B. Glass
, C. Dry wood
D. Copper
Answer: D. Copper
Rationale: Copper has relatively low electrical resistance and is widely
used for electrical conductors. Aluminum is also extensively used,
particularly for utility distribution conductors, because of its lower
weight and cost.
8. What is the main purpose of electrical insulation?
A. Increase conductor current
B. Increase circuit frequency
C. Prevent unintended current flow and protect people from
energized conductors
D. Make conductors heavier
Answer: C. Prevent unintended current flow and protect people
from energized conductors
Rationale: Insulation separates conductive materials from one another
and from people or grounded surfaces. Damaged, deteriorated, or
improperly installed insulation can create shock, short-circuit, and fire
hazards.
9. Which tool is commonly used to tighten or loosen hexagonal nuts?
A. Pipe wrench
B. Socket wrench
C. Hacksaw
D. Wire brush
Questions And Correct Answers
(Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. What is the primary purpose of personal protective equipment
(PPE) when performing electrical work?
A. To make the work faster
B. To eliminate the need for safe work practices
C. To reduce the worker’s exposure to hazards
D. To replace electrical training
Answer: C. To reduce the worker’s exposure to hazards
Rationale: PPE provides a layer of protection against hazards such as
electrical shock, arc flash, flying particles, burns, and other workplace
dangers. PPE does not eliminate the hazard and must be used together
with appropriate procedures, training, and hazard controls.
2. Which unit is used to measure electrical current?
A. Ohm
B. Volt
C. Watt
D. Ampere
Answer: D. Ampere
,Rationale: Electrical current is measured in amperes, commonly
called amps. Voltage measures electrical potential difference,
resistance is measured in ohms, and power is commonly measured in
watts.
3. What instrument is normally used to measure voltage?
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Watt-hour meter
Answer: A. Voltmeter
Rationale: A voltmeter measures the potential difference between two
points. It is connected across the portion of the circuit being tested
rather than placed in series like an ammeter.
4. According to Ohm’s law, voltage is equal to:
A. Current divided by resistance
B. Resistance divided by current
C. Current multiplied by resistance
D. Power multiplied by resistance
Answer: C. Current multiplied by resistance
Rationale: Ohm’s law is V = I × R. Voltage equals current multiplied
by resistance. This relationship is fundamental to understanding and
calculating basic electrical circuits.
,5. Which condition presents the greatest immediate danger when
working near energized electrical equipment?
A. A dirty tool
B. Unexpected contact with an energized conductor
C. A loose paper document
D. Low ambient lighting
Answer: B. Unexpected contact with an energized conductor
Rationale: Contact with energized conductors can result in severe
shock, burns, arc flash, or fatal injury. Electrical workers must
identify sources of energy and follow required safe-work procedures
before approaching or handling electrical equipment.
6. What does resistance oppose in an electrical circuit?
A. Voltage
B. Power
C. Current flow
D. Frequency
Answer: C. Current flow
Rationale: Electrical resistance opposes the movement of electric
charge. For a given voltage, increasing resistance generally decreases
current according to Ohm’s law.
7. Which material is generally considered a good electrical
conductor?
A. Rubber
B. Glass
, C. Dry wood
D. Copper
Answer: D. Copper
Rationale: Copper has relatively low electrical resistance and is widely
used for electrical conductors. Aluminum is also extensively used,
particularly for utility distribution conductors, because of its lower
weight and cost.
8. What is the main purpose of electrical insulation?
A. Increase conductor current
B. Increase circuit frequency
C. Prevent unintended current flow and protect people from
energized conductors
D. Make conductors heavier
Answer: C. Prevent unintended current flow and protect people
from energized conductors
Rationale: Insulation separates conductive materials from one another
and from people or grounded surfaces. Damaged, deteriorated, or
improperly installed insulation can create shock, short-circuit, and fire
hazards.
9. Which tool is commonly used to tighten or loosen hexagonal nuts?
A. Pipe wrench
B. Socket wrench
C. Hacksaw
D. Wire brush
