Alabama Electrical Contractor Licensing Exam
Practice Test Questions With 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 labor rates
B. To provide minimum safety standards for electrical installations
C. To regulate utility companies
D. To establish contractor licensing fees
Answer: B. To provide minimum safety standards for electrical
installations
Rationale: The NEC is designed to safeguard persons and property
from hazards arising from the use of electricity. It establishes
minimum safety requirements for electrical installations but is not
intended as a design specification or instruction manual.
2. Which type of current changes direction periodically?
,A. Direct Current (DC)
B. Static Current
C. Alternating Current (AC)
D. Ground Current
Rationale: Alternating Current reverses direction at regular intervals,
typically 60 times per second (60 Hz) in the United States. Most
residential and commercial electrical systems use AC power.
3. Ohm's Law states that voltage equals:
A. Current divided by resistance
B. Resistance divided by current
C. Current multiplied by power
D. Current multiplied by resistance
Rationale: Ohm's Law is expressed as V = I × R, where voltage (V)
equals current (I) multiplied by resistance (R). This formula is
fundamental in electrical calculations.
4. What is the unit of electrical resistance?
A. Volt
B. Ampere
C. Watt
D. Ohm
,Rationale: Resistance is measured in ohms (Ω). It indicates how much
a material opposes the flow of electrical current.
5. Which NEC article covers grounding and bonding?
A. Article 110
B. Article 250
C. Article 300
D. Article 430
Answer: B. Article 250
Rationale: NEC Article 250 contains the requirements for grounding
and bonding of electrical systems, equipment, and conductors to
ensure safety and fault-current paths.
6. What is the unit of electrical power?
A. Volt
B. Ampere
C. Watt
D. Ohm
Rationale: Power is measured in watts and represents the rate at
which electrical energy is used or produced. Power equals voltage
multiplied by current.
7. A conductor with excessive resistance will typically:
, A. Run cooler
B. Reduce voltage drop
C. Generate heat
D. Improve efficiency
Rationale: As resistance increases, more electrical energy is converted
into heat. Excessive resistance can create dangerous overheating
conditions.
8. Which device is designed primarily to protect against overloads
and short circuits?
A. Switch
B. Receptacle
C. Transformer
D. Circuit breaker
Rationale: Circuit breakers automatically interrupt current flow when
abnormal conditions such as overloads or short circuits occur.
9. What color insulation is generally used for grounded conductors?
A. Red
B. Blue
C. Green
D. White or gray
Practice Test Questions With 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 labor rates
B. To provide minimum safety standards for electrical installations
C. To regulate utility companies
D. To establish contractor licensing fees
Answer: B. To provide minimum safety standards for electrical
installations
Rationale: The NEC is designed to safeguard persons and property
from hazards arising from the use of electricity. It establishes
minimum safety requirements for electrical installations but is not
intended as a design specification or instruction manual.
2. Which type of current changes direction periodically?
,A. Direct Current (DC)
B. Static Current
C. Alternating Current (AC)
D. Ground Current
Rationale: Alternating Current reverses direction at regular intervals,
typically 60 times per second (60 Hz) in the United States. Most
residential and commercial electrical systems use AC power.
3. Ohm's Law states that voltage equals:
A. Current divided by resistance
B. Resistance divided by current
C. Current multiplied by power
D. Current multiplied by resistance
Rationale: Ohm's Law is expressed as V = I × R, where voltage (V)
equals current (I) multiplied by resistance (R). This formula is
fundamental in electrical calculations.
4. What is the unit of electrical resistance?
A. Volt
B. Ampere
C. Watt
D. Ohm
,Rationale: Resistance is measured in ohms (Ω). It indicates how much
a material opposes the flow of electrical current.
5. Which NEC article covers grounding and bonding?
A. Article 110
B. Article 250
C. Article 300
D. Article 430
Answer: B. Article 250
Rationale: NEC Article 250 contains the requirements for grounding
and bonding of electrical systems, equipment, and conductors to
ensure safety and fault-current paths.
6. What is the unit of electrical power?
A. Volt
B. Ampere
C. Watt
D. Ohm
Rationale: Power is measured in watts and represents the rate at
which electrical energy is used or produced. Power equals voltage
multiplied by current.
7. A conductor with excessive resistance will typically:
, A. Run cooler
B. Reduce voltage drop
C. Generate heat
D. Improve efficiency
Rationale: As resistance increases, more electrical energy is converted
into heat. Excessive resistance can create dangerous overheating
conditions.
8. Which device is designed primarily to protect against overloads
and short circuits?
A. Switch
B. Receptacle
C. Transformer
D. Circuit breaker
Rationale: Circuit breakers automatically interrupt current flow when
abnormal conditions such as overloads or short circuits occur.
9. What color insulation is generally used for grounded conductors?
A. Red
B. Blue
C. Green
D. White or gray
