NCCER ELECTRICIAN EXAM
2026 — 100 PRACTICE
QUESTIONS WITH ANSWERS
SECTION 1 — ELECTRICAL THEORY (1–15)
1. What is the unit of electrical resistance?
A. Watt
B. Ampere
C. Ohm (✓)
D. Volt
2. The relationship between voltage, current, and resistance is described by:
A. Faraday’s Law
B. Newton’s Law
C. Ohm’s Law (✓)
D. Ampere’s Law
3. Power in an electrical circuit is calculated as:
A. P = V/R
B. P = I/R
C. P = V × I (✓)
D. P = V − I
4. A material that resists electrical flow is called:
A. Conductor
B. Semiconductor
C. Capacitor
D. Insulator (✓)
5. In a DC circuit, current flows:
A. Back and forth
B. Only in one direction (✓)
,C. In pulses
D. Randomly
6. Increasing conductor size will generally:
A. Increase resistance
B. Decrease resistance (✓)
C. Have no effect
D. Reverse current flow
7. What is the frequency of standard AC power in the U.S.?
A. 25 Hz
B. 50 Hz
C. 60 Hz (✓)
D. 75 Hz
8. The force that pushes current through a conductor is called:
A. Resistance
B. Voltage (✓)
C. Capacitance
D. Inductance
9. In a series circuit, total resistance is:
A. Product of all resistances
B. Sum of all resistances (✓)
C. Always equal to one resistor
D. Half the sum
10. What happens to current if voltage increases and resistance stays constant?
A. Decreases
B. Stays the same
C. Increases (✓)
D. Stops
11. An inductor primarily resists changes in:
A. Voltage
B. Resistance
C. Current (✓)
D. Frequency
12. A capacitor stores energy in the form of:
A. Heat
,B. Magnetic field
C. Chemical reaction
D. Electric field (✓)
13. The unit of electrical power is the:
A. Volt
B. Ampere
C. Watt (✓)
D. Henry
14. Alternating current reverses direction:
A. Randomly
B. Once per cycle (✓)
C. Never
D. Only in generators
15. Which law states that opposite charges attract?
A. Faraday’s Law
B. Coulomb’s Law (✓)
C. Ampere’s Law
D. Maxell’s Law
SECTION 2 — NATIONAL ELECTRICAL CODE (NEC) (16–35)
16. The NEC is updated every:
A. 2 years
B. 3 years (✓)
C. 4 years
D. 5 years
17. Which NEC article covers grounding and bonding?
A. Article 110
B. Article 230
C. Article 250 (✓)
D. Article 430
18. Minimum working clearance in front of electrical panels is:
A. 12 in.
B. 18 in.
, C. 24 in.
D. 36 in. (✓)
19. GFCI protection is required for outlets in:
A. Bedrooms
B. Kitchens (✓)
C. Offices
D. Attics
20. Which article covers branch circuits?
A. Article 210 (✓)
B. Article 300
C. Article 500
D. Article 680
21. Maximum number of bends in a conduit run between pull points:
A. 180° (✓)
B. 270°
C. 360°
D. Unlimited
22. Receptacles in bathrooms must be:
A. Ungrounded
B. 15A only
C. GFCI-protected (✓)
D. Switch-controlled
23. Which device protects against overload?
A. Relay
B. Fuse (✓)
C. Timer
D. Contactor
24. Minimum burial depth for rigid metal conduit underground:
A. 0"
B. 6"
C. 12"
D. 6"–18" depending on conditions (✓)
25. Arc-fault protection is required in:
A. Garages
2026 — 100 PRACTICE
QUESTIONS WITH ANSWERS
SECTION 1 — ELECTRICAL THEORY (1–15)
1. What is the unit of electrical resistance?
A. Watt
B. Ampere
C. Ohm (✓)
D. Volt
2. The relationship between voltage, current, and resistance is described by:
A. Faraday’s Law
B. Newton’s Law
C. Ohm’s Law (✓)
D. Ampere’s Law
3. Power in an electrical circuit is calculated as:
A. P = V/R
B. P = I/R
C. P = V × I (✓)
D. P = V − I
4. A material that resists electrical flow is called:
A. Conductor
B. Semiconductor
C. Capacitor
D. Insulator (✓)
5. In a DC circuit, current flows:
A. Back and forth
B. Only in one direction (✓)
,C. In pulses
D. Randomly
6. Increasing conductor size will generally:
A. Increase resistance
B. Decrease resistance (✓)
C. Have no effect
D. Reverse current flow
7. What is the frequency of standard AC power in the U.S.?
A. 25 Hz
B. 50 Hz
C. 60 Hz (✓)
D. 75 Hz
8. The force that pushes current through a conductor is called:
A. Resistance
B. Voltage (✓)
C. Capacitance
D. Inductance
9. In a series circuit, total resistance is:
A. Product of all resistances
B. Sum of all resistances (✓)
C. Always equal to one resistor
D. Half the sum
10. What happens to current if voltage increases and resistance stays constant?
A. Decreases
B. Stays the same
C. Increases (✓)
D. Stops
11. An inductor primarily resists changes in:
A. Voltage
B. Resistance
C. Current (✓)
D. Frequency
12. A capacitor stores energy in the form of:
A. Heat
,B. Magnetic field
C. Chemical reaction
D. Electric field (✓)
13. The unit of electrical power is the:
A. Volt
B. Ampere
C. Watt (✓)
D. Henry
14. Alternating current reverses direction:
A. Randomly
B. Once per cycle (✓)
C. Never
D. Only in generators
15. Which law states that opposite charges attract?
A. Faraday’s Law
B. Coulomb’s Law (✓)
C. Ampere’s Law
D. Maxell’s Law
SECTION 2 — NATIONAL ELECTRICAL CODE (NEC) (16–35)
16. The NEC is updated every:
A. 2 years
B. 3 years (✓)
C. 4 years
D. 5 years
17. Which NEC article covers grounding and bonding?
A. Article 110
B. Article 230
C. Article 250 (✓)
D. Article 430
18. Minimum working clearance in front of electrical panels is:
A. 12 in.
B. 18 in.
, C. 24 in.
D. 36 in. (✓)
19. GFCI protection is required for outlets in:
A. Bedrooms
B. Kitchens (✓)
C. Offices
D. Attics
20. Which article covers branch circuits?
A. Article 210 (✓)
B. Article 300
C. Article 500
D. Article 680
21. Maximum number of bends in a conduit run between pull points:
A. 180° (✓)
B. 270°
C. 360°
D. Unlimited
22. Receptacles in bathrooms must be:
A. Ungrounded
B. 15A only
C. GFCI-protected (✓)
D. Switch-controlled
23. Which device protects against overload?
A. Relay
B. Fuse (✓)
C. Timer
D. Contactor
24. Minimum burial depth for rigid metal conduit underground:
A. 0"
B. 6"
C. 12"
D. 6"–18" depending on conditions (✓)
25. Arc-fault protection is required in:
A. Garages
