Colorado Electrical Apprentice
Registration & Qualification Practice
Exam 2026 | 100 Questions & Answers
with Detailed Rationales | Complete
Colorado Electrical Apprentice Exam
Prep & Study Guide
1. What is the primary purpose of an electrical apprentice registration or
qualification?
A. To allow an apprentice to work independently without supervision
B. To establish authorization to perform electrical work as an apprentice under
required supervision
C. To replace the journeyman electrician license
D. To eliminate the need for electrical training
Answer: To establish authorization to perform electrical work as an apprentice
under required supervision
Rationale: An electrical apprentice is generally permitted to perform electrical
work as part of supervised training. Apprentice registration does not make the
individual an independently licensed electrician.
, 2. Under electrical apprenticeship training, who is generally responsible for
supervising an apprentice's electrical work?
A. Any construction worker
B. The property owner
C. A properly qualified and authorized supervising electrician
D. The apprentice's coworker
Answer: A properly qualified and authorized supervising electrician
Rationale: Apprentices must perform electrical work under the supervision
required by applicable licensing rules. The supervising electrician is responsible
for directing and overseeing the apprentice's work.
3. What is the safest first step before beginning work on an electrical circuit?
A. Remove the cover plate
B. Turn on the circuit
C. Identify the circuit and de-energize it when required
D. Replace the breaker
Answer: Identify the circuit and de-energize it when required
Rationale: Proper circuit identification and de-energization are fundamental
electrical safety practices. The circuit should be verified before work begins.
4. Which instrument is commonly used to measure voltage?
A. Ammeter
B. Voltmeter
C. Ohmmeter
D. Watt-hour meter
Answer: Voltmeter
Rationale: A voltmeter measures electrical potential difference, or voltage,
between two points in a circuit.
, 5. What is the basic unit of electrical current?
A. Volt
B. Ohm
C. Ampere
D. Watt
Answer: Ampere
Rationale: The ampere, commonly called an amp, is the SI unit used to measure
electric current.
6. What is the basic unit of electrical resistance?
A. Watt
B. Volt
C. Ampere
D. Ohm
Answer: Ohm
Rationale: Resistance is measured in ohms (Ω). Resistance opposes the flow of
electric current.
7. According to Ohm's law, which equation represents voltage?
A. V = I × R
B. V = I ÷ R
C. V = R ÷ I
D. V = P ÷ R
Answer: V = I × R
Rationale: Ohm's law states that voltage equals current multiplied by
resistance.
8. A 120-volt circuit has a resistance of 20 ohms. Approximately how much
current flows?
, A. 2 A
B. 4 A
C. 6 A
D. 10 A
Answer: 6 A
Rationale: Using Ohm's law, I = V ÷ R. Therefore, 120 ÷ 20 = 6 amperes.
9. What happens to current in a circuit when resistance increases while
voltage remains constant?
A. Current increases
B. Current decreases
C. Current becomes zero in every case
D. Voltage automatically increases
Answer: Current decreases
Rationale: According to Ohm's law, current is inversely proportional to
resistance when voltage remains constant.
10.What is the purpose of an overcurrent protective device?
A. To increase circuit voltage
B. To protect conductors and equipment from excessive current
C. To eliminate grounding
D. To increase motor speed
Answer: To protect conductors and equipment from excessive current
Rationale: Fuses and circuit breakers provide overcurrent protection by
interrupting a circuit when current exceeds permitted levels.
11.Which device is designed to interrupt a circuit automatically when
excessive current flows?
Registration & Qualification Practice
Exam 2026 | 100 Questions & Answers
with Detailed Rationales | Complete
Colorado Electrical Apprentice Exam
Prep & Study Guide
1. What is the primary purpose of an electrical apprentice registration or
qualification?
A. To allow an apprentice to work independently without supervision
B. To establish authorization to perform electrical work as an apprentice under
required supervision
C. To replace the journeyman electrician license
D. To eliminate the need for electrical training
Answer: To establish authorization to perform electrical work as an apprentice
under required supervision
Rationale: An electrical apprentice is generally permitted to perform electrical
work as part of supervised training. Apprentice registration does not make the
individual an independently licensed electrician.
, 2. Under electrical apprenticeship training, who is generally responsible for
supervising an apprentice's electrical work?
A. Any construction worker
B. The property owner
C. A properly qualified and authorized supervising electrician
D. The apprentice's coworker
Answer: A properly qualified and authorized supervising electrician
Rationale: Apprentices must perform electrical work under the supervision
required by applicable licensing rules. The supervising electrician is responsible
for directing and overseeing the apprentice's work.
3. What is the safest first step before beginning work on an electrical circuit?
A. Remove the cover plate
B. Turn on the circuit
C. Identify the circuit and de-energize it when required
D. Replace the breaker
Answer: Identify the circuit and de-energize it when required
Rationale: Proper circuit identification and de-energization are fundamental
electrical safety practices. The circuit should be verified before work begins.
4. Which instrument is commonly used to measure voltage?
A. Ammeter
B. Voltmeter
C. Ohmmeter
D. Watt-hour meter
Answer: Voltmeter
Rationale: A voltmeter measures electrical potential difference, or voltage,
between two points in a circuit.
, 5. What is the basic unit of electrical current?
A. Volt
B. Ohm
C. Ampere
D. Watt
Answer: Ampere
Rationale: The ampere, commonly called an amp, is the SI unit used to measure
electric current.
6. What is the basic unit of electrical resistance?
A. Watt
B. Volt
C. Ampere
D. Ohm
Answer: Ohm
Rationale: Resistance is measured in ohms (Ω). Resistance opposes the flow of
electric current.
7. According to Ohm's law, which equation represents voltage?
A. V = I × R
B. V = I ÷ R
C. V = R ÷ I
D. V = P ÷ R
Answer: V = I × R
Rationale: Ohm's law states that voltage equals current multiplied by
resistance.
8. A 120-volt circuit has a resistance of 20 ohms. Approximately how much
current flows?
, A. 2 A
B. 4 A
C. 6 A
D. 10 A
Answer: 6 A
Rationale: Using Ohm's law, I = V ÷ R. Therefore, 120 ÷ 20 = 6 amperes.
9. What happens to current in a circuit when resistance increases while
voltage remains constant?
A. Current increases
B. Current decreases
C. Current becomes zero in every case
D. Voltage automatically increases
Answer: Current decreases
Rationale: According to Ohm's law, current is inversely proportional to
resistance when voltage remains constant.
10.What is the purpose of an overcurrent protective device?
A. To increase circuit voltage
B. To protect conductors and equipment from excessive current
C. To eliminate grounding
D. To increase motor speed
Answer: To protect conductors and equipment from excessive current
Rationale: Fuses and circuit breakers provide overcurrent protection by
interrupting a circuit when current exceeds permitted levels.
11.Which device is designed to interrupt a circuit automatically when
excessive current flows?
