Wisconsin Registered Electrician Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of grounding electrical systems?
A. To increase voltage
B. To reduce wire size
C. To provide a safe path for fault current
D. To improve lighting efficiency
Grounding provides a low-resistance path for fault current, helping
overcurrent devices operate quickly and reducing the risk of electric shock
and fire.
2. Which personal protective equipment (PPE) is most appropriate when
working on energized electrical equipment?
A. Cotton gloves only
B. Safety glasses only
,C. Leather boots only
D. Arc-rated clothing and insulated gloves
Arc-rated clothing and properly rated insulated gloves help protect
workers from arc flash hazards and electrical shock during energized work.
3. What device is designed to protect people from electric shock by
detecting ground faults?
A. Standard breaker
B. Fuse
C. AFCI
D. GFCI
A Ground-Fault Circuit Interrupter (GFCI) detects small leakage currents
and interrupts power rapidly to reduce the risk of electrical shock.
4. What is the primary function of a circuit breaker?
A. Increase voltage
B. Reduce frequency
C. Interrupt excessive current during overloads or short circuits
D. Store electrical energy
Circuit breakers automatically open the circuit when excessive current
flows, protecting conductors and equipment from damage.
, 5. Which conductor is normally identified by white or gray insulation?
A. Equipment grounding conductor
B. Ungrounded conductor
C. Grounded (neutral) conductor
D. Traveler conductor
The grounded conductor is identified by white or gray insulation and serves
as the neutral return path in most systems.
6. Electrical resistance is measured in:
A. Volts
B. Amperes
C. Watts
D. Ohms
Resistance is measured in ohms and represents opposition to the flow of
electric current.
7. Which law expresses the relationship between voltage, current, and
resistance?
A. Kirchhoff's Law
B. Faraday's Law
C. Coulomb's Law
D. Ohm's Law
, Ohm's Law states that voltage equals current multiplied by resistance (V = I
× R).
8. A 20-amp branch circuit supplying general receptacles typically
requires what minimum copper conductor size?
A. 14 AWG
B. 16 AWG
C. 12 AWG
D. 10 AWG
A 20-amp branch circuit requires at least 12 AWG copper conductors under
normal installation conditions.
9. Which instrument measures electrical current without opening the
circuit?
A. Voltmeter
B. Ohmmeter
C. Megohmmeter
D. Clamp meter
A clamp meter measures current by sensing the magnetic field around a
conductor without disconnecting it.
10. Before beginning work on electrical equipment, an electrician
should first:
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of grounding electrical systems?
A. To increase voltage
B. To reduce wire size
C. To provide a safe path for fault current
D. To improve lighting efficiency
Grounding provides a low-resistance path for fault current, helping
overcurrent devices operate quickly and reducing the risk of electric shock
and fire.
2. Which personal protective equipment (PPE) is most appropriate when
working on energized electrical equipment?
A. Cotton gloves only
B. Safety glasses only
,C. Leather boots only
D. Arc-rated clothing and insulated gloves
Arc-rated clothing and properly rated insulated gloves help protect
workers from arc flash hazards and electrical shock during energized work.
3. What device is designed to protect people from electric shock by
detecting ground faults?
A. Standard breaker
B. Fuse
C. AFCI
D. GFCI
A Ground-Fault Circuit Interrupter (GFCI) detects small leakage currents
and interrupts power rapidly to reduce the risk of electrical shock.
4. What is the primary function of a circuit breaker?
A. Increase voltage
B. Reduce frequency
C. Interrupt excessive current during overloads or short circuits
D. Store electrical energy
Circuit breakers automatically open the circuit when excessive current
flows, protecting conductors and equipment from damage.
, 5. Which conductor is normally identified by white or gray insulation?
A. Equipment grounding conductor
B. Ungrounded conductor
C. Grounded (neutral) conductor
D. Traveler conductor
The grounded conductor is identified by white or gray insulation and serves
as the neutral return path in most systems.
6. Electrical resistance is measured in:
A. Volts
B. Amperes
C. Watts
D. Ohms
Resistance is measured in ohms and represents opposition to the flow of
electric current.
7. Which law expresses the relationship between voltage, current, and
resistance?
A. Kirchhoff's Law
B. Faraday's Law
C. Coulomb's Law
D. Ohm's Law
, Ohm's Law states that voltage equals current multiplied by resistance (V = I
× R).
8. A 20-amp branch circuit supplying general receptacles typically
requires what minimum copper conductor size?
A. 14 AWG
B. 16 AWG
C. 12 AWG
D. 10 AWG
A 20-amp branch circuit requires at least 12 AWG copper conductors under
normal installation conditions.
9. Which instrument measures electrical current without opening the
circuit?
A. Voltmeter
B. Ohmmeter
C. Megohmmeter
D. Clamp meter
A clamp meter measures current by sensing the magnetic field around a
conductor without disconnecting it.
10. Before beginning work on electrical equipment, an electrician
should first:
