Texas Journeyman Electrician
Examination Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of the National Electrical Code
(NEC)?
A. To establish electrical utility rates
B. To provide practical safeguards for persons and property from
electrical hazards
C. To regulate electrical contractor advertising
D. To establish electrician wages
Answer: B. To provide practical safeguards for persons and property
from electrical hazards
Rationale: The NEC establishes minimum safety requirements
intended to protect people and property from hazards associated with
electrical installations.
2. Which NEC article contains general requirements for branch
circuits?
A. Article 100
B. Article 210
C. Article 250
D. Article 300
Answer: B. Article 210
,Rationale: Article 210 covers branch circuits, including their
requirements for ratings, conductors, outlets, and overcurrent
protection.
3. What is the standard nominal voltage supplied by a typical single-
phase residential service in Texas?
A. 120/240 volts
B. 120/208 volts only
C. 240/480 volts
D. 277/480 volts
Answer: A. 120/240 volts
Rationale: Typical dwelling services use a 120/240-volt single-phase,
three-wire system with two ungrounded conductors and a grounded
conductor.
4. What is the purpose of a circuit breaker?
A. To increase circuit voltage
B. To provide overcurrent protection
C. To reduce conductor resistance
D. To improve power factor
Answer: B. To provide overcurrent protection
Rationale: A circuit breaker opens a circuit when excessive current
occurs, protecting conductors and connected equipment from
dangerous overcurrent conditions.
5. Which conductor normally carries current back toward the source
in a single-phase 120-volt circuit?
A. Equipment grounding conductor
B. Grounding electrode conductor
,C. Grounded conductor
D. Bonding jumper
Answer: C. Grounded conductor
Rationale: The grounded conductor, commonly called the neutral,
normally provides the return path for current in a 120-volt circuit.
6. Which conductor is normally identified by white or gray
insulation?
A. Ungrounded conductor
B. Grounded conductor
C. Equipment grounding conductor
D. Switched conductor only
Answer: B. Grounded conductor
Rationale: The NEC generally identifies grounded circuit conductors
by white or gray insulation or an approved equivalent marking
method.
7. What color is commonly used to identify an equipment grounding
conductor?
A. White
B. Gray
C. Green or bare
D. Orange only
Answer: C. Green or bare
Rationale: Equipment grounding conductors are commonly bare,
covered with green insulation, or identified with green markings as
permitted by the NEC.
8. What is the unit of electrical resistance?
, A. Volt
B. Ampere
C. Ohm
D. Watt
Answer: C. Ohm
Rationale: The ohm is the SI unit of electrical resistance and
represents opposition to current flow.
9. Which formula expresses Ohm's Law?
A. P = I/R
B. E = I × R
C. R = E × I
D. I = E × R
Answer: B. E = I × R
Rationale: Ohm's Law states that voltage equals current multiplied by
resistance, commonly written E = I × R.
10. A 120-volt load draws 10 amperes. What is its approximate
power consumption?
A. 12 watts
B. 120 watts
C. 1,200 watts
D. 12,000 watts
Answer: C. 1,200 watts
Rationale: Power equals voltage multiplied by current. Therefore, 120
volts × 10 amperes equals 1,200 watts.
11. What is the approximate current of a 2,400-watt resistive
load operating at 240 volts?
Examination Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of the National Electrical Code
(NEC)?
A. To establish electrical utility rates
B. To provide practical safeguards for persons and property from
electrical hazards
C. To regulate electrical contractor advertising
D. To establish electrician wages
Answer: B. To provide practical safeguards for persons and property
from electrical hazards
Rationale: The NEC establishes minimum safety requirements
intended to protect people and property from hazards associated with
electrical installations.
2. Which NEC article contains general requirements for branch
circuits?
A. Article 100
B. Article 210
C. Article 250
D. Article 300
Answer: B. Article 210
,Rationale: Article 210 covers branch circuits, including their
requirements for ratings, conductors, outlets, and overcurrent
protection.
3. What is the standard nominal voltage supplied by a typical single-
phase residential service in Texas?
A. 120/240 volts
B. 120/208 volts only
C. 240/480 volts
D. 277/480 volts
Answer: A. 120/240 volts
Rationale: Typical dwelling services use a 120/240-volt single-phase,
three-wire system with two ungrounded conductors and a grounded
conductor.
4. What is the purpose of a circuit breaker?
A. To increase circuit voltage
B. To provide overcurrent protection
C. To reduce conductor resistance
D. To improve power factor
Answer: B. To provide overcurrent protection
Rationale: A circuit breaker opens a circuit when excessive current
occurs, protecting conductors and connected equipment from
dangerous overcurrent conditions.
5. Which conductor normally carries current back toward the source
in a single-phase 120-volt circuit?
A. Equipment grounding conductor
B. Grounding electrode conductor
,C. Grounded conductor
D. Bonding jumper
Answer: C. Grounded conductor
Rationale: The grounded conductor, commonly called the neutral,
normally provides the return path for current in a 120-volt circuit.
6. Which conductor is normally identified by white or gray
insulation?
A. Ungrounded conductor
B. Grounded conductor
C. Equipment grounding conductor
D. Switched conductor only
Answer: B. Grounded conductor
Rationale: The NEC generally identifies grounded circuit conductors
by white or gray insulation or an approved equivalent marking
method.
7. What color is commonly used to identify an equipment grounding
conductor?
A. White
B. Gray
C. Green or bare
D. Orange only
Answer: C. Green or bare
Rationale: Equipment grounding conductors are commonly bare,
covered with green insulation, or identified with green markings as
permitted by the NEC.
8. What is the unit of electrical resistance?
, A. Volt
B. Ampere
C. Ohm
D. Watt
Answer: C. Ohm
Rationale: The ohm is the SI unit of electrical resistance and
represents opposition to current flow.
9. Which formula expresses Ohm's Law?
A. P = I/R
B. E = I × R
C. R = E × I
D. I = E × R
Answer: B. E = I × R
Rationale: Ohm's Law states that voltage equals current multiplied by
resistance, commonly written E = I × R.
10. A 120-volt load draws 10 amperes. What is its approximate
power consumption?
A. 12 watts
B. 120 watts
C. 1,200 watts
D. 12,000 watts
Answer: C. 1,200 watts
Rationale: Power equals voltage multiplied by current. Therefore, 120
volts × 10 amperes equals 1,200 watts.
11. What is the approximate current of a 2,400-watt resistive
load operating at 240 volts?
