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LADWP ELECTRICAL CRAFT HELPER EXAM Original Questions with
Answers & Detailed Rationales
SECTION 1: BASIC ELECTRICAL THEORY
1. Ohm's law states that voltage equals:
A) Current divided by resistance
B) Current multiplied by resistance
C) Resistance divided by current
D) Power divided by resistance
Answer: B
Rationale: Ohm's law: E = I × R (Voltage = Current × Resistance).
This fundamental relationship governs all electrical circuits.
2. A circuit has 120 volts and a resistance of 30 ohms. The
current is:
A) 2 amperes
B) 3 amperes
C) 4 amperes
D) 5 amperes
Answer: C
Rationale: I = E / R = 120V / 30Ω = 4 amperes.
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3. The unit of electrical power is the:
A) Volt
B) Ampere
C) Watt
D) Ohm
Answer: C
Rationale: Power is measured in watts (W). P = E × I (Power =
Voltage × Current).
4. A 120-volt circuit draws 10 amperes. The power consumed is:
A) 1,200 watts
B) 1,000 watts
C) 12 watts
D) 1,500 watts
Answer: A
Rationale: P = E × I = 120V × 10A = 1,200 watts.
5. The unit of electrical resistance is the:
A) Volt
B) Ampere
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C) Watt
D) Ohm
Answer: D
Rationale: Resistance is measured in ohms (Ω), opposing
current flow.
6. The unit of electrical current is the:
A) Volt
B) Ampere
C) Watt
D) Ohm
Answer: B
Rationale: Current is measured in amperes (amps), the flow of
electric charge.
7. In a series circuit, the current is:
A) Different at each component
B) The same through all components
C) Zero
D) Divided among components
Answer: B
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Rationale: In a series circuit, there is only one path for current,
so it is identical at every point.
8. In a parallel circuit, the voltage across each branch is:
A) Divided equally
B) The same as the source voltage
C) Summed together
D) Zero
Answer: B
Rationale: In a parallel circuit, all branches receive the full
source voltage.
9. The total resistance of a series circuit with resistors of 20Ω,
30Ω, and 50Ω is:
A) 50Ω
B) 80Ω
C) 100Ω
D) 120Ω
Answer: C
Rationale: Series: R(total) = R1 + R2 + R3 = 20 + 30 + 50 = 100Ω.
LADWP ELECTRICAL CRAFT HELPER EXAM Original Questions with
Answers & Detailed Rationales
SECTION 1: BASIC ELECTRICAL THEORY
1. Ohm's law states that voltage equals:
A) Current divided by resistance
B) Current multiplied by resistance
C) Resistance divided by current
D) Power divided by resistance
Answer: B
Rationale: Ohm's law: E = I × R (Voltage = Current × Resistance).
This fundamental relationship governs all electrical circuits.
2. A circuit has 120 volts and a resistance of 30 ohms. The
current is:
A) 2 amperes
B) 3 amperes
C) 4 amperes
D) 5 amperes
Answer: C
Rationale: I = E / R = 120V / 30Ω = 4 amperes.
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3. The unit of electrical power is the:
A) Volt
B) Ampere
C) Watt
D) Ohm
Answer: C
Rationale: Power is measured in watts (W). P = E × I (Power =
Voltage × Current).
4. A 120-volt circuit draws 10 amperes. The power consumed is:
A) 1,200 watts
B) 1,000 watts
C) 12 watts
D) 1,500 watts
Answer: A
Rationale: P = E × I = 120V × 10A = 1,200 watts.
5. The unit of electrical resistance is the:
A) Volt
B) Ampere
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C) Watt
D) Ohm
Answer: D
Rationale: Resistance is measured in ohms (Ω), opposing
current flow.
6. The unit of electrical current is the:
A) Volt
B) Ampere
C) Watt
D) Ohm
Answer: B
Rationale: Current is measured in amperes (amps), the flow of
electric charge.
7. In a series circuit, the current is:
A) Different at each component
B) The same through all components
C) Zero
D) Divided among components
Answer: B
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Rationale: In a series circuit, there is only one path for current,
so it is identical at every point.
8. In a parallel circuit, the voltage across each branch is:
A) Divided equally
B) The same as the source voltage
C) Summed together
D) Zero
Answer: B
Rationale: In a parallel circuit, all branches receive the full
source voltage.
9. The total resistance of a series circuit with resistors of 20Ω,
30Ω, and 50Ω is:
A) 50Ω
B) 80Ω
C) 100Ω
D) 120Ω
Answer: C
Rationale: Series: R(total) = R1 + R2 + R3 = 20 + 30 + 50 = 100Ω.
