COLORADO ELECTRICAL CONTRACTOR LICENSING
EXAM QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) Q&A 2026 |INSTANT
DONLOAD PDF
1. What is the primary purpose of the National Electrical Code
(NEC)?
A. To design electrical appliances
B. To ensure electrical safety standards are followed
C. To calculate utility bills
D. To regulate electrical company profits
Rationale: The NEC provides safety standards for electrical
design, installation, and inspection.
Correct Answer: B
2. Which organization publishes the NEC?
A. OSHA
B. IEEE
C. NFPA
D. ANSI
Rationale: The National Fire Protection Association (NFPA)
publishes the NEC.
Correct Answer: C
,3. What does Ohm’s Law state?
A. V = I × R
B. P = V × I
C. I = P × R
D. R = P × V
Rationale: Ohm’s Law defines the relationship between
voltage, current, and resistance.
Correct Answer: A
4. What unit is used to measure electrical resistance?
A. Volt
B. Ampere
C. Ohm
D. Watt
Rationale: Resistance is measured in ohms (Ω).
Correct Answer: C
5. Which device protects a circuit from overcurrent?
A. Transformer
B. Circuit breaker
C. Conductor
D. Switch
,Rationale: Circuit breakers interrupt current flow when
overload occurs.
Correct Answer: B
6. What is the function of a ground wire?
A. Increase voltage
B. Provide a return path for current
C. Prevent electrical shock by directing fault current to earth
D. Store electrical energy
Rationale: Grounding protects people and equipment from
fault currents.
Correct Answer: C
7. Which material is most commonly used as an electrical
conductor?
A. Rubber
B. Copper
C. Plastic
D. Glass
Rationale: Copper has high conductivity and is widely used in
wiring.
Correct Answer: B
8. What does voltage represent in an electrical system?
, A. Flow of electrons
B. Electrical pressure
C. Resistance to current
D. Energy loss
Rationale: Voltage is the electrical potential difference or
pressure.
Correct Answer: B
9. Which of the following is a non-metallic sheathed cable
commonly used in residential wiring?
A. THHN
B. Romex (NM cable)
C. MC cable
D. BX cable
Rationale: NM cable (Romex) is commonly used in homes.
Correct Answer: B
10. What is the purpose of a GFCI outlet?
A. Increase power output
B. Protect against ground faults and shock
C. Reduce electricity bills
D. Stabilize voltage
EXAM QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) Q&A 2026 |INSTANT
DONLOAD PDF
1. What is the primary purpose of the National Electrical Code
(NEC)?
A. To design electrical appliances
B. To ensure electrical safety standards are followed
C. To calculate utility bills
D. To regulate electrical company profits
Rationale: The NEC provides safety standards for electrical
design, installation, and inspection.
Correct Answer: B
2. Which organization publishes the NEC?
A. OSHA
B. IEEE
C. NFPA
D. ANSI
Rationale: The National Fire Protection Association (NFPA)
publishes the NEC.
Correct Answer: C
,3. What does Ohm’s Law state?
A. V = I × R
B. P = V × I
C. I = P × R
D. R = P × V
Rationale: Ohm’s Law defines the relationship between
voltage, current, and resistance.
Correct Answer: A
4. What unit is used to measure electrical resistance?
A. Volt
B. Ampere
C. Ohm
D. Watt
Rationale: Resistance is measured in ohms (Ω).
Correct Answer: C
5. Which device protects a circuit from overcurrent?
A. Transformer
B. Circuit breaker
C. Conductor
D. Switch
,Rationale: Circuit breakers interrupt current flow when
overload occurs.
Correct Answer: B
6. What is the function of a ground wire?
A. Increase voltage
B. Provide a return path for current
C. Prevent electrical shock by directing fault current to earth
D. Store electrical energy
Rationale: Grounding protects people and equipment from
fault currents.
Correct Answer: C
7. Which material is most commonly used as an electrical
conductor?
A. Rubber
B. Copper
C. Plastic
D. Glass
Rationale: Copper has high conductivity and is widely used in
wiring.
Correct Answer: B
8. What does voltage represent in an electrical system?
, A. Flow of electrons
B. Electrical pressure
C. Resistance to current
D. Energy loss
Rationale: Voltage is the electrical potential difference or
pressure.
Correct Answer: B
9. Which of the following is a non-metallic sheathed cable
commonly used in residential wiring?
A. THHN
B. Romex (NM cable)
C. MC cable
D. BX cable
Rationale: NM cable (Romex) is commonly used in homes.
Correct Answer: B
10. What is the purpose of a GFCI outlet?
A. Increase power output
B. Protect against ground faults and shock
C. Reduce electricity bills
D. Stabilize voltage
