IDAHO JOURNEYMAN ELECTRICIAN
Newest (2026 Update) Actual Practice
Questions – Set 100 Most Common
Exam Questions And Answers In Details
100% Verified Exam
1. A 120V circuit supplies a 12Ω load. What is the current?
A. 5A
B. 10A
C. 12A
D. 15A
Correct Answer: B ✓ (10A)
Explanation: Using Ohm’s Law I = V ÷ R = 120 ÷ 12 = 10A.
2. According to NEC, which conductor is primarily used for grounding?
A. Hot conductor
B. Neutral conductor
C. Equipment grounding conductor
D. Ungrounded conductor
Correct Answer: C ✓ (Equipment grounding conductor)
Explanation: The equipment grounding conductor provides a safe fault
current path to ground.
3. What is the minimum burial depth for residential branch circuit UF cable
under a 120V circuit without additional protection?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
, Correct Answer: C ✓ (18 inches)
Explanation: NEC typically requires 18 inches burial depth for direct-buried
UF cable.
4. A 240V heater draws 20A. What is its power consumption?
A. 2,400W
B. 4,800W
C. 3,600W
D. 5,000W
Correct Answer: B ✓ (4,800W)
Explanation: Power P = V × I = 240 × 20 = 4,800 watts.
5. What device protects against ground-fault currents in wet locations?
A. AFCI
B. GFCI
C. Fuse
D. Disconnect switch
Correct Answer: B ✓ (GFCI)
Explanation: GFCIs trip when leakage current is detected, preventing
shock hazards.
6. The resistance of a conductor increases when:
A. Temperature decreases
B. Length decreases
C. Temperature increases
D. Voltage decreases
Correct Answer: C ✓ (Temperature increases)
Explanation: Higher temperature increases electron resistance in
conductors.
7. Which conduit type is most commonly used outdoors and underground?
A. EMT
B. PVC
C. FMC
, D. ENT
Correct Answer: B ✓ (PVC)
Explanation: PVC is corrosion-resistant and approved for underground
installations.
8. What is the purpose of a circuit breaker?
A. Increase voltage
B. Store energy
C. Protect against overcurrent
D. Convert AC to DC
Correct Answer: C ✓ (Protect against overcurrent)
Explanation: Breakers automatically open the circuit during overload or
short circuit.
9. A 30A circuit requires a minimum conductor size of:
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Correct Answer: C ✓ (10 AWG)
Explanation: NEC requires 10 AWG copper for 30-amp circuits.
10.What is the function of a neutral conductor?
A. Carries fault current only
B. Carries unbalanced current back to source
C. Grounds equipment
D. Prevents overload
Correct Answer: B ✓ (Carries unbalanced current back to source)
Explanation: Neutral returns current in single-phase circuits.
11.Voltage drop is primarily affected by:
A. Color of wire
B. Conductor length and current
C. Breaker size
Newest (2026 Update) Actual Practice
Questions – Set 100 Most Common
Exam Questions And Answers In Details
100% Verified Exam
1. A 120V circuit supplies a 12Ω load. What is the current?
A. 5A
B. 10A
C. 12A
D. 15A
Correct Answer: B ✓ (10A)
Explanation: Using Ohm’s Law I = V ÷ R = 120 ÷ 12 = 10A.
2. According to NEC, which conductor is primarily used for grounding?
A. Hot conductor
B. Neutral conductor
C. Equipment grounding conductor
D. Ungrounded conductor
Correct Answer: C ✓ (Equipment grounding conductor)
Explanation: The equipment grounding conductor provides a safe fault
current path to ground.
3. What is the minimum burial depth for residential branch circuit UF cable
under a 120V circuit without additional protection?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
, Correct Answer: C ✓ (18 inches)
Explanation: NEC typically requires 18 inches burial depth for direct-buried
UF cable.
4. A 240V heater draws 20A. What is its power consumption?
A. 2,400W
B. 4,800W
C. 3,600W
D. 5,000W
Correct Answer: B ✓ (4,800W)
Explanation: Power P = V × I = 240 × 20 = 4,800 watts.
5. What device protects against ground-fault currents in wet locations?
A. AFCI
B. GFCI
C. Fuse
D. Disconnect switch
Correct Answer: B ✓ (GFCI)
Explanation: GFCIs trip when leakage current is detected, preventing
shock hazards.
6. The resistance of a conductor increases when:
A. Temperature decreases
B. Length decreases
C. Temperature increases
D. Voltage decreases
Correct Answer: C ✓ (Temperature increases)
Explanation: Higher temperature increases electron resistance in
conductors.
7. Which conduit type is most commonly used outdoors and underground?
A. EMT
B. PVC
C. FMC
, D. ENT
Correct Answer: B ✓ (PVC)
Explanation: PVC is corrosion-resistant and approved for underground
installations.
8. What is the purpose of a circuit breaker?
A. Increase voltage
B. Store energy
C. Protect against overcurrent
D. Convert AC to DC
Correct Answer: C ✓ (Protect against overcurrent)
Explanation: Breakers automatically open the circuit during overload or
short circuit.
9. A 30A circuit requires a minimum conductor size of:
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Correct Answer: C ✓ (10 AWG)
Explanation: NEC requires 10 AWG copper for 30-amp circuits.
10.What is the function of a neutral conductor?
A. Carries fault current only
B. Carries unbalanced current back to source
C. Grounds equipment
D. Prevents overload
Correct Answer: B ✓ (Carries unbalanced current back to source)
Explanation: Neutral returns current in single-phase circuits.
11.Voltage drop is primarily affected by:
A. Color of wire
B. Conductor length and current
C. Breaker size
