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Alabama Electrical Contractor Licensing
Examination Residential Electrician
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
- What is the primary purpose of a circuit breaker? A. Increase voltage B. Store electrical energy C. Protect against overcurrent D. Convert AC to DC Answer: C Rationale: A circuit breaker automatically interrupts current flow when it detects overloads or short circuits, protecting wiring and equipment from overheating and fire hazards.
- The standard voltage for residential branch circuits in the United States is: A. 120/240V B. 277/480V C. 600V D. 12/24V Answer: A Rationale: Residential systems typically use a split-phase 120/240V system, providing 120V for general outlets and 240V for large appliances like dryers and HVAC equipment.
- What does GFCI stand for? A. Ground Fault Circuit Interrupter B. General Fuse Current Indicator C. Grounded Feed Circuit Interface D. Ground Fault Control Inverter Answer: A Rationale: A GFCI detects imbalance between hot and neutral conductors and quickly shuts off power to prevent electric shock hazards.
- Which wire is typically the grounding conductor? A. Black B. White C. Green or bare copper D. Red Answer: C Rationale: The green or bare copper wire is designated as the equipment grounding conductor, providing a safe path for fault current.
- The function of a neutral wire is to: A. Carry fault current only B. Complete the circuit back to the source C. Provide grounding only D. Increase voltage stability Answer: B Rationale: The neutral wire carries current back to the electrical source, completing the circuit and maintaining system balance.
- What device protects against arc faults in residential wiring? A. GFCI
C. I = PR
D. R = VI²
Answer: B Rationale: Ohm’s Law defines voltage as current multiplied by resistance, forming the basis of electrical circuit calculations. 10.The purpose of a main breaker is to: A. Control lighting B. Disconnect all power to the panel C. Increase amperage D. Stabilize voltage Answer: B Rationale: The main breaker allows complete shutdown of electrical power for safety during maintenance or emergencies. 11.A 20-amp circuit typically uses wire size: A. 14 AWG B. 12 AWG C. 10 AWG D. 8 AWG Answer: B Rationale: 12 AWG wire is rated for 20 amps in typical residential applications per NEC guidelines. 12.What color is typically used for hot wires in 120V circuits? A. White B. Green C. Black
D. Bare Answer: C Rationale: Black insulation is commonly used to identify hot conductors carrying current from the source. 13.A short circuit occurs when: A. Resistance increases B. Current flows through unintended path C. Voltage drops normally D. Load decreases Answer: B Rationale: A short circuit bypasses normal load resistance, allowing excessive current flow that can damage components. 14.Grounding primarily helps to: A. Increase voltage B. Prevent electrical shock C. Store energy D. Reduce wire size Answer: B Rationale: Grounding provides a safe path for fault current, reducing the risk of electric shock. 15.The standard frequency of electrical power in the U.S. is: A. 50 Hz B. 60 Hz C. 100 Hz D. 120 Hz Answer: B
19.The purpose of a transformer is to: A. Store energy B. Change voltage levels C. Measure resistance D. Break circuits Answer: B Rationale: Transformers increase or decrease AC voltage levels for distribution and use. 20.A ground fault occurs when: A. Voltage increases B. Current flows to ground unintentionally C. Resistance increases D. Circuit is open Answer: B Rationale: Ground faults happen when current leaks to ground, creating shock hazards. 21.A series circuit has: A. Multiple paths for current B. One path for current C. No resistance D. Only AC current Answer: B Rationale: In a series circuit, current flows through a single continuous path. 22.Parallel circuits are used in homes because: A. They reduce voltage B. Devices operate independently
C. They increase resistance D. They eliminate current Answer: B Rationale: Parallel circuits allow each device to function independently without affecting others. 23.Electrical resistance is measured in: A. Amperes B. Volts C. Ohms D. Watts Answer: C Rationale: Resistance opposes current flow and is measured in ohms. 24.The main purpose of insulation on wires is to: A. Conduct electricity B. Prevent current leakage C. Increase voltage D. Reduce amperage Answer: B Rationale: Insulation prevents unintended contact and electrical leakage. 25.A typical residential outlet voltage is: A. 12V B. 120V C. 240V D. 480V Answer: B
29.The purpose of a junction box is to: A. Store tools B. Enclose wire connections safely C. Increase voltage D. Reduce resistance Answer: B Rationale: Junction boxes protect and organize wire splices and connections. 30.The unit of electrical power is: A. Volt B. Ohm C. Watt D. Ampere Answer: C Rationale: Power is measured in watts, representing energy consumption rate. 31 – 50 continued in same format: 31.An open circuit means: A. Current flows freely B. Circuit is complete C. No current flows D. Voltage increases Answer: C Rationale: An open circuit has a break, stopping current flow completely. 32.The purpose of AFCI breakers is to prevent: A. Overvoltage B. Arc fires
C. Grounding issues D. Voltage drops Answer: B Rationale: AFCIs detect arc faults that could cause electrical fires. 33.Voltage is measured in: A. Watts B. Volts C. Amps D. Ohms Answer: B Rationale: Voltage represents electrical potential difference. 34.Current is measured in: A. Volts B. Ohms C. Amps D. Watts Answer: C Rationale: Current is the flow of electrons measured in amperes. 35.Resistance increases when: A. Wire is shorter B. Wire is thinner C. Voltage increases D. Current increases Answer: B
39.The function of a switch is to: A. Store electricity B. Open or close a circuit C. Increase current D. Convert voltage Answer: B Rationale: Switches control the flow of electricity by opening or closing circuits. 40.Electrical energy is converted into light in a: A. Motor B. Generator C. Lamp D. Transformer Answer: C Rationale: Lamps convert electrical energy into light energy. 41.A circuit overload occurs when: A. Voltage drops B. Too many devices draw power C. Resistance increases D. Current stops Answer: B Rationale: Overloads happen when demand exceeds circuit capacity. 42.A voltmeter measures: A. Current B. Resistance C. Voltage
D. Power Answer: C Rationale: Voltmeters measure electrical potential difference. 43.Electrical shock danger increases with: A. Lower voltage B. Higher current C. Lower resistance D. Lower frequency Answer: B Rationale: Increased current through the body increases shock severity. 44.A breaker trips due to: A. Low resistance B. Overcurrent C. High insulation D. Low voltage Answer: B Rationale: Breakers trip when current exceeds safe limits. 45.A ground rod is used to: A. Increase voltage B. Provide earth connection C. Store electricity D. Insulate system Answer: B Rationale: Ground rods safely dissipate fault currents into earth.
D. Reduce load Answer: B Rationale: It ensures wiring insulation is intact and safe. 50.A conductor’s ampacity refers to: A. Voltage capacity B. Current-carrying capacity C. Resistance level D. Power output Answer: B Rationale: Ampacity is the maximum current a conductor can safely carry. 51.What is the purpose of a service entrance? A. Interior lighting B. Entry point of electrical supply to building C. Appliance control D. Voltage conversion Answer: B Rationale: The service entrance brings electrical power from the utility into the building system. 52.A subpanel is used to: A. Generate electricity B. Distribute power to specific areas C. Increase voltage D. Replace transformer Answer: B
Rationale: Subpanels distribute electricity to specific circuits in different building areas. 53.What protects conductors from physical damage in walls? A. Paint B. Conduit or cable sheathing C. Switches D. Breakers Answer: B Rationale: Conduit and cable sheathing protect wiring from physical harm. 54.The purpose of bonding is to: A. Increase resistance B. Ensure electrical continuity between metal parts C. Reduce voltage D. Store energy Answer: B Rationale: Bonding connects metal components to maintain equal potential and safety. 55.A 240V circuit typically uses how many hot wires? A. 1 B. 2 C. 3 D. 4 Answer: B Rationale: 240V circuits use two hot conductors providing phase-to-phase voltage.
C. Store energy D. Convert AC to DC Answer: B Rationale: Disconnects provide a means to safely shut off power to equipment. 60.The color code for neutral conductor is: A. Black B. White C. Red D. Blue Answer: B Rationale: White is standard for neutral conductors in residential wiring. 61.A conduit fill chart is used to: A. Calculate voltage B. Determine wire capacity in conduit C. Measure current D. Test insulation Answer: B Rationale: It ensures safe wire spacing and prevents overheating. 62.A transformer works on: A. DC only B. AC only C. Both AC and DC D. Battery power Answer: B Rationale: Transformers require alternating current to operate.
63.What is the purpose of a capacitor in motors? A. Increase resistance B. Start or run motor efficiently C. Reduce voltage permanently D. Store current only Answer: B Rationale: Capacitors provide phase shift for motor starting and operation. 64.A kilowatt equals: A. 10 watts B. 100 watts C. 1,000 watts D. 10,000 watts Answer: C Rationale: A kilowatt is equal to 1,000 watts of power. 65.The purpose of a service meter is to: A. Measure resistance B. Measure energy consumption C. Increase voltage D. Ground system Answer: B Rationale: Utility meters track electricity usage for billing. 66.What is the main hazard of overloaded circuits? A. Reduced brightness B. Fire hazard
