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JOURNEYMAN ELECTRICIAN LICENSING
EXAMINATION QUESTIONS AND
CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
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- What does NEC stand for? A. National Electrical Code B. National Energy Council C. National Electrical Code D. National Electric Commission The NEC is the National Electrical Code, which sets standards for safe electrical installation.
- What is the standard voltage for a single-phase residential system in the U.S.? A. 110 V B. 120/240 V C. 208 V D. 480 V Residential systems typically use 120/240 V split-phase service.
- What color is typically used for grounding conductors? A. Red B. Black C. Blue D. Green or bare Grounding conductors are identified by green insulation or are bare.
- Ohm’s Law states that voltage equals: A. Current × Resistance B. Current × Resistance C. Resistance ÷ Current D. Power ÷ Current Ohm’s Law is V = I × R.
- What is the unit of electrical resistance? A. Volt B. Ampere C. Watt D. Ohm Resistance is measured in ohms.
- What device protects against overload? A. Transformer B. Relay C. Circuit breaker D. Capacitor Circuit breakers interrupt current during overload conditions.
- What does GFCI stand for? A. General Fault Circuit Interrupter B. Ground Fault Circuit Interrupter C. Ground Fuse Circuit Indicator D. General Fuse Circuit Interrupter GFCIs protect against ground faults by detecting current imbalance.
- What is the frequency of AC power in the U.S.? A. 50 Hz B. 60 Hz C. 120 Hz D. 240 Hz Standard AC frequency in the U.S. is 60 Hz.
14.What does a fuse do? A. Increases voltage B. Stores energy C. Opens circuit during overload D. Grounds current Fuses melt to break the circuit when current is excessive. 15.What is the color for neutral conductor? A. Red B. White or gray C. Green D. Blue Neutral conductors are white or gray. 16.What is the unit of current? A. Volt B. Watt C. Ohm D. Ampere Current is measured in amperes. 17.What is resistance to current flow? A. Voltage B. Power C. Resistance D. Conductance Resistance opposes current flow. 18.What tool measures voltage? A. Ammeter B. Ohmmeter C. Voltmeter D. Wattmeter Voltmeters measure electrical potential difference.
19.What type of circuit has only one path? A. Parallel B. Series C. Hybrid D. Loop Series circuits have a single path for current. 20.What is the NEC requirement for box fill? A. Based on voltage B. Based on resistance C. Based on conductor count and size D. Based on power Box fill is calculated based on conductor number and gauge. 21.What device converts AC to DC? A. Inverter B. Transformer C. Rectifier D. Capacitor Rectifiers convert AC to DC. 22.What is grounding? A. Insulating wires B. Increasing voltage C. Connecting to earth D. Decreasing current Grounding provides a safe path to earth. 23.What is a short circuit? A. Open circuit B. High resistance C. Low resistance path D. No current flow Short circuits allow excessive current due to low resistance.
29.What is voltage? A. Current flow B. Resistance C. Electrical pressure D. Power Voltage drives current through a circuit. 30.What is a parallel circuit characteristic? A. Same current B. Same voltage C. No voltage D. No current Parallel circuits have equal voltage across branches. 31.What does an ammeter measure? A. Voltage B. Power C. Resistance D. Current Ammeters measure current flow. 32.What protects people from shock? A. Breaker B. Fuse C. GFCI D. Relay GFCIs detect imbalance and trip quickly. 33.What is a load? A. Source B. Device consuming power C. Wire D. Ground Loads use electrical energy.
34.What is power factor? A. Voltage/current ratio B. Real power/apparent power C. Resistance/current D. Energy/time Power factor shows efficiency of power usage. 35.What is conduit used for? A. Generate power B. Store energy C. Protect wiring D. Measure current Conduit protects and routes conductors. 36.What is a breaker rating based on? A. Voltage B. Resistance C. Current capacity D. Power factor Breakers are rated by current they can safely interrupt. 37.What is a watt-hour? A. Power B. Voltage C. Energy D. Resistance Energy consumption is measured in watt-hours. 38.What is a relay? A. Switch B. Electrically operated switch C. Fuse D. Motor Relays use electrical signals to open/close circuits.
44.What is a branch circuit? A. Main supply B. Final circuit to load C. Transformer D. Ground Branch circuits supply outlets and devices. 45.What is an overload? A. Low current B. Excess current C. No current D. Balanced current Overload occurs when current exceeds rating. 46.What is voltage drop? A. Voltage increase B. Loss of voltage in circuit C. Resistance increase D. Current increase Voltage decreases over long conductors. 47.What is an open circuit? A. Closed path B. Broken path C. Ground path D. Parallel path Open circuits stop current flow. 48.What is the purpose of bonding? A. Insulate B. Ensure continuity of ground path C. Increase voltage D. Reduce current Bonding connects metal parts for safety.
49.What is a load center? A. Generator B. Panelboard C. Transformer D. Motor Load centers distribute electricity. 50.What is RMS value? A. Peak value B. Effective value of AC C. Minimum value D. Zero value RMS represents usable AC voltage. (Continuing…) 51.What is a kilowatt? A. 100 watts B. 1000 watts C. 10 watts D. 1 watt 1 kilowatt equals 1000 watts. 52.What is conduit fill? A. Voltage rating B. Number of conductors allowed C. Resistance D. Current Conduit fill limits wire quantity. 53.What is insulation rating? A. Current B. Voltage C. Temperature capacity
D. Power Transformer voltage depends on turns ratio. 59.What is impedance? A. Resistance only B. Total opposition in AC C. Voltage D. Current Impedance includes resistance and reactance. 60.What is reactance? A. Resistance B. Voltage C. Opposition from inductance/capacitance D. Power Reactance affects AC circuits. 61.What is load calculation? A. Voltage B. Determining demand C. Resistance D. Current Load calculations ensure proper sizing. 62.What is service entrance? A. Load B. Panel C. Point where power enters building D. Ground Service entrance is where utility connects. 63.What is conductor ampacity? A. Voltage B. Resistance C. Current capacity
D. Power Ampacity defines safe current limit. 64.What is a feeder? A. Branch circuit B. Conductors supplying panel C. Ground D. Switch Feeders supply power to subpanels. 65.What is a panelboard? A. Motor B. Distribution panel C. Transformer D. Relay Panelboards house breakers. 66.What is a disconnect means? A. Fuse B. Switch to cut power C. Relay D. Motor Disconnects isolate circuits. 67.What is a busbar? A. Wire B. Conductive bar C. Switch D. Ground Busbars distribute current. 68.What is grounding electrode? A. Fuse B. Earth connection device C. Relay
D. Current Diversity accounts for different usage times. 74.What is a motor starter? A. Switch B. Controls motor start C. Fuse D. Relay Starters protect and control motors. 75.What is a contactor? A. Fuse B. Heavy-duty relay C. Switch D. Ground Contactors control large loads. 76.What is a timer? A. Relay B. Controls timing of circuits C. Fuse D. Switch Timers automate operations. 77.What is a pilot light? A. Fuse B. Indicator light C. Switch D. Ground Pilot lights show circuit status. 78.What is a limit switch? A. Fuse B. Position-activated switch C. Relay
D. Ground Limit switches detect movement limits. 79.What is a proximity sensor? A. Switch B. Detects objects without contact C. Fuse D. Ground Sensors detect presence electronically. 80.What is a PLC? A. Panel B. Programmable Logic Controller C. Fuse D. Relay PLCs automate industrial processes. 81.What is ladder logic? A. Code B. PLC programming method C. Circuit D. Load Ladder diagrams represent control logic. 82.What is an inverter? A. Transformer B. DC to AC converter C. Fuse D. Relay Inverters convert DC to AC. 83.What is a UPS? A. Transformer B. Uninterruptible Power Supply C. Fuse
D. Load Phase carries energized current. 89.What is a delta system? A. Star B. Triangle connection C. Ground D. Neutral Delta systems use triangular winding. 90.What is a wye system? A. Delta B. Star connection C. Ground D. Neutral Wye systems have a common neutral point. 91.What is phase rotation? A. Voltage B. Sequence of phases C. Current D. Power Rotation affects motor direction. 92.What is a megger? A. Voltmeter B. Insulation tester C. Ammeter D. Wattmeter Meggers test insulation resistance. 93.What is lockout/tagout? A. Wiring B. Safety procedure C. Grounding
D. Bonding LOTO prevents accidental energizing. 94.What is PPE? A. Tool B. Personal Protective Equipment C. Device D. Circuit PPE protects workers from hazards. 95.What is arc flash? A. Ground fault B. Explosive arc event C. Short circuit D. Open circuit Arc flash can cause severe injury. 96.What is clearance distance? A. Voltage B. Safe working space C. Current D. Power Clearance ensures safe access. 97.What is working space requirement? A. Voltage B. Safe area around equipment C. Current D. Power NEC defines workspace for safety. 98.What is a service disconnect? A. Fuse B. Main shutoff device C. Relay
