California Residential Electrician Certification
Examination Questions With Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. What is the primary purpose of a circuit breaker in a residential
electrical system?
A. To increase voltage
B. To store electrical energy
C. To protect against overcurrent
D. To reduce resistance
Answer: C. To protect against overcurrent
Circuit breakers are safety devices designed to interrupt the flow of
electricity when excessive current is detected, preventing overheating
and fire hazards.
2. Which wire is typically used as the grounding conductor in
residential wiring?
A. Red wire
, B. Black wire
C. White wire
D. Bare copper wire
Answer: D. Bare copper wire
Bare copper or green-insulated wire is used for grounding to safely
carry fault current to earth.
3. What is the standard voltage for most residential outlets in the
United States?
A. 120 volts
B. 240 volts
C. 277 volts
D. 480 volts
Answer: A. 120 volts
Most standard household receptacles in the U.S. supply 120 volts for
general use appliances and lighting.
4. What does Ohm’s Law state?
A. Power equals voltage times resistance
B. Current equals voltage divided by resistance
, C. Voltage equals current times resistance
D. Resistance equals voltage times current
Answer: C. Voltage equals current times resistance
Ohm’s Law defines the relationship V = I × R, which is fundamental in
electrical calculations.
5. Which device is used to protect against ground faults in residential
bathrooms and kitchens?
A. AFCI
B. GFCI
C. Fuse
D. Transformer
Answer: B. GFCI
A Ground Fault Circuit Interrupter protects against electrical shock by
shutting off power when imbalance is detected.
6. What color is typically used for the neutral wire?
A. Black
B. Red
, C. White
D. Green
Answer: C. White
White insulation identifies the neutral conductor in standard
residential wiring systems.
7. What is the purpose of a junction box?
A. Increase voltage
B. Store electricity
C. Protect wire connections
D. Convert AC to DC
Answer: C. Protect wire connections
Junction boxes safely contain and protect electrical splices from
damage and exposure.
8. What does AFCI stand for?
A. Automatic Fault Current Interrupter
B. Arc Fault Circuit Interrupter
C. Alternating Fuse Circuit Interface
D. Auxiliary Flow Control Indicator
Examination Questions With Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. What is the primary purpose of a circuit breaker in a residential
electrical system?
A. To increase voltage
B. To store electrical energy
C. To protect against overcurrent
D. To reduce resistance
Answer: C. To protect against overcurrent
Circuit breakers are safety devices designed to interrupt the flow of
electricity when excessive current is detected, preventing overheating
and fire hazards.
2. Which wire is typically used as the grounding conductor in
residential wiring?
A. Red wire
, B. Black wire
C. White wire
D. Bare copper wire
Answer: D. Bare copper wire
Bare copper or green-insulated wire is used for grounding to safely
carry fault current to earth.
3. What is the standard voltage for most residential outlets in the
United States?
A. 120 volts
B. 240 volts
C. 277 volts
D. 480 volts
Answer: A. 120 volts
Most standard household receptacles in the U.S. supply 120 volts for
general use appliances and lighting.
4. What does Ohm’s Law state?
A. Power equals voltage times resistance
B. Current equals voltage divided by resistance
, C. Voltage equals current times resistance
D. Resistance equals voltage times current
Answer: C. Voltage equals current times resistance
Ohm’s Law defines the relationship V = I × R, which is fundamental in
electrical calculations.
5. Which device is used to protect against ground faults in residential
bathrooms and kitchens?
A. AFCI
B. GFCI
C. Fuse
D. Transformer
Answer: B. GFCI
A Ground Fault Circuit Interrupter protects against electrical shock by
shutting off power when imbalance is detected.
6. What color is typically used for the neutral wire?
A. Black
B. Red
, C. White
D. Green
Answer: C. White
White insulation identifies the neutral conductor in standard
residential wiring systems.
7. What is the purpose of a junction box?
A. Increase voltage
B. Store electricity
C. Protect wire connections
D. Convert AC to DC
Answer: C. Protect wire connections
Junction boxes safely contain and protect electrical splices from
damage and exposure.
8. What does AFCI stand for?
A. Automatic Fault Current Interrupter
B. Arc Fault Circuit Interrupter
C. Alternating Fuse Circuit Interface
D. Auxiliary Flow Control Indicator
