LADWP Electrical Craft Helper
LOS ANGELES DEPARTMENT OF WATER AND POWER (LADWP) ELECTRICAL
CRAFT HELPER EXAM QUESTIONS WITH VERIFIED SOLUTIONS - UPDATED
VERSION
LADWP Electrical Craft Helper
1. According to Ohm's Law, which formula correctly relates voltage, current, and
resistance?
A. V = R / I
B. V = I × R
C. I = V × R
D. V = I / R
ANSWER : B. V = I × R — Ohm's Law states voltage equals current multiplied by
resistance.
2. What is the standard unit of measurement for electrical resistance?
A. Ampere
B. Watt
C. Ohm
D. Farad
ANSWER : C. Ohm — Resistance is measured in ohms, symbolized by the Greek letter
omega.
3. Electrical current is measured in which unit?
A. Joule
B. Ampere
C. Volt
D. Ohm
ANSWER : B. Ampere — Current, the flow of electric charge, is measured in amperes
(amps).
4. Which unit measures electrical potential difference?
A. Coulomb
B. Volt
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C. Ohm
D. Watt
ANSWER : B. Volt — Voltage, or electrical potential difference, is measured in volts.
5. Electrical power is measured in which unit?
A. Ampere
B. Volt
C. Henry
D. Watt
ANSWER : D. Watt — Power is measured in watts, equal to voltage multiplied by current.
6. Which formula correctly calculates electrical power?
A. P = I / V
B. P = V × I
C. P = V − I
D. P = V / I
ANSWER : B. P = V × I — Power equals voltage multiplied by current (P = VI).
7. In a series circuit, how is total resistance calculated?
A. By averaging the resistances
B. By adding all individual resistances together
C. By taking the reciprocal of the sum
D. By multiplying all resistances together
ANSWER : B. By adding all individual resistances together — In series circuits, total
resistance is the sum of each resistor's value.
8. In a parallel circuit, what is true about voltage across each branch?
A. Voltage is divided equally among branches
B. Voltage is the same across every branch
C. Voltage decreases with each added branch
D. Voltage only exists in the main branch
ANSWER : B. Voltage is the same across every branch — Parallel branches share the
same voltage as the source.
9. Which of the following is a good electrical conductor?
A. Wood
B. Copper
C. Rubber
D. Glass
ANSWER : B. Copper — Copper's free electrons make it an excellent conductor of
electricity.
10. Which material is commonly used as an electrical insulator?
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A. Rubber
B. Copper
C. Aluminum
D. Silver
ANSWER : A. Rubber — Rubber resists the flow of electric current, making it a common
insulator.
11. What does "AC" stand for in electrical terminology?
A. Ampere Charge
B. Applied Circuit
C. Alternating Current
D. Active Current
ANSWER : C. Alternating Current — AC refers to current that periodically reverses
direction.
12. What does "DC" stand for in electrical terminology?
A. Dynamic Charge
B. Direct Current
C. Double Circuit
D. Diverted Current
ANSWER : B. Direct Current — DC describes current that flows in only one direction.
13. What is the standard frequency of AC power in the United States?
A. 100 Hz
B. 50 Hz
C. 60 Hz
D. 120 Hz
ANSWER : C. 60 Hz — US power systems operate at a standard frequency of 60 hertz.
14. What is the standard voltage for most U.S. household outlets?
A. 480 volts
B. 120 volts
C. 240 volts only
D. 12 volts
ANSWER : B. 120 volts — Standard residential outlets in the U.S. supply 120 volts.
15. Which device is used to increase or decrease AC voltage levels?
A. Transformer
B. Capacitor
C. Resistor
D. Diode
ANSWER : A. Transformer — Transformers use electromagnetic induction to step
voltage up or down.
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16. Which instrument is used to measure voltage, current, and resistance?
A. Thermometer
B. Multimeter
C. Barometer
D. Anemometer
ANSWER : B. Multimeter — A multimeter is a versatile tool for measuring multiple
electrical values.
17. What is a short circuit?
A. A circuit with too much resistance
B. A circuit that is properly grounded
C. An unintended low-resistance connection between two points in a circuit
D. A circuit operating at low voltage
ANSWER : C. An unintended low-resistance connection between two points in a circuit
— A short circuit creates an unintended path allowing excess current flow.
18. In standard U.S. wiring, what color is the ground wire?
A. White
B. Red
C. Green or bare copper
D. Black
ANSWER : C. Green or bare copper — Ground wires are identified by green insulation
or bare copper.
19. In standard U.S. wiring, what color typically identifies the "hot" (energized) wire?
A. Bare copper
B. Green
C. White
D. Black
ANSWER : D. Black — Black is the conventional color for ungrounded, energized
conductors.
20. In standard U.S. wiring, what color identifies the neutral wire?
A. Black
B. Green
C. Red
D. White
ANSWER : D. White — White insulation conventionally marks the neutral conductor.
Electrical Safety & PPE
21. What does the acronym "LOTO" stand for in electrical safety?
A. Lockout/Tagout
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LOS ANGELES DEPARTMENT OF WATER AND POWER (LADWP) ELECTRICAL
CRAFT HELPER EXAM QUESTIONS WITH VERIFIED SOLUTIONS - UPDATED
VERSION
LADWP Electrical Craft Helper
1. According to Ohm's Law, which formula correctly relates voltage, current, and
resistance?
A. V = R / I
B. V = I × R
C. I = V × R
D. V = I / R
ANSWER : B. V = I × R — Ohm's Law states voltage equals current multiplied by
resistance.
2. What is the standard unit of measurement for electrical resistance?
A. Ampere
B. Watt
C. Ohm
D. Farad
ANSWER : C. Ohm — Resistance is measured in ohms, symbolized by the Greek letter
omega.
3. Electrical current is measured in which unit?
A. Joule
B. Ampere
C. Volt
D. Ohm
ANSWER : B. Ampere — Current, the flow of electric charge, is measured in amperes
(amps).
4. Which unit measures electrical potential difference?
A. Coulomb
B. Volt
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C. Ohm
D. Watt
ANSWER : B. Volt — Voltage, or electrical potential difference, is measured in volts.
5. Electrical power is measured in which unit?
A. Ampere
B. Volt
C. Henry
D. Watt
ANSWER : D. Watt — Power is measured in watts, equal to voltage multiplied by current.
6. Which formula correctly calculates electrical power?
A. P = I / V
B. P = V × I
C. P = V − I
D. P = V / I
ANSWER : B. P = V × I — Power equals voltage multiplied by current (P = VI).
7. In a series circuit, how is total resistance calculated?
A. By averaging the resistances
B. By adding all individual resistances together
C. By taking the reciprocal of the sum
D. By multiplying all resistances together
ANSWER : B. By adding all individual resistances together — In series circuits, total
resistance is the sum of each resistor's value.
8. In a parallel circuit, what is true about voltage across each branch?
A. Voltage is divided equally among branches
B. Voltage is the same across every branch
C. Voltage decreases with each added branch
D. Voltage only exists in the main branch
ANSWER : B. Voltage is the same across every branch — Parallel branches share the
same voltage as the source.
9. Which of the following is a good electrical conductor?
A. Wood
B. Copper
C. Rubber
D. Glass
ANSWER : B. Copper — Copper's free electrons make it an excellent conductor of
electricity.
10. Which material is commonly used as an electrical insulator?
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A. Rubber
B. Copper
C. Aluminum
D. Silver
ANSWER : A. Rubber — Rubber resists the flow of electric current, making it a common
insulator.
11. What does "AC" stand for in electrical terminology?
A. Ampere Charge
B. Applied Circuit
C. Alternating Current
D. Active Current
ANSWER : C. Alternating Current — AC refers to current that periodically reverses
direction.
12. What does "DC" stand for in electrical terminology?
A. Dynamic Charge
B. Direct Current
C. Double Circuit
D. Diverted Current
ANSWER : B. Direct Current — DC describes current that flows in only one direction.
13. What is the standard frequency of AC power in the United States?
A. 100 Hz
B. 50 Hz
C. 60 Hz
D. 120 Hz
ANSWER : C. 60 Hz — US power systems operate at a standard frequency of 60 hertz.
14. What is the standard voltage for most U.S. household outlets?
A. 480 volts
B. 120 volts
C. 240 volts only
D. 12 volts
ANSWER : B. 120 volts — Standard residential outlets in the U.S. supply 120 volts.
15. Which device is used to increase or decrease AC voltage levels?
A. Transformer
B. Capacitor
C. Resistor
D. Diode
ANSWER : A. Transformer — Transformers use electromagnetic induction to step
voltage up or down.
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16. Which instrument is used to measure voltage, current, and resistance?
A. Thermometer
B. Multimeter
C. Barometer
D. Anemometer
ANSWER : B. Multimeter — A multimeter is a versatile tool for measuring multiple
electrical values.
17. What is a short circuit?
A. A circuit with too much resistance
B. A circuit that is properly grounded
C. An unintended low-resistance connection between two points in a circuit
D. A circuit operating at low voltage
ANSWER : C. An unintended low-resistance connection between two points in a circuit
— A short circuit creates an unintended path allowing excess current flow.
18. In standard U.S. wiring, what color is the ground wire?
A. White
B. Red
C. Green or bare copper
D. Black
ANSWER : C. Green or bare copper — Ground wires are identified by green insulation
or bare copper.
19. In standard U.S. wiring, what color typically identifies the "hot" (energized) wire?
A. Bare copper
B. Green
C. White
D. Black
ANSWER : D. Black — Black is the conventional color for ungrounded, energized
conductors.
20. In standard U.S. wiring, what color identifies the neutral wire?
A. Black
B. Green
C. Red
D. White
ANSWER : D. White — White insulation conventionally marks the neutral conductor.
Electrical Safety & PPE
21. What does the acronym "LOTO" stand for in electrical safety?
A. Lockout/Tagout
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