NCCER ELECTRICIAN TEST STUDY GUIDE
2026
100 Practice Questions & Answers (Well-
Structured, Latest Edition)
SECTION 1 — BASIC ELECTRICAL THEORY (1–20)
1. What is the unit of electrical current?
A. Volt
B. Ampere ✓
C. Ohm
D. Watt
2. Which law states that voltage = current × resistance?
A. Kirchhoff’s Law
B. Ohm’s Law ✓
C. Faraday’s Law
D. Coulomb’s Law
3. What is the standard frequency of AC power in the U.S.?
A. 25 Hz
B. 60 Hz ✓
C. 50 Hz
D. 100 Hz
4. Resistance is measured in:
A. Volts
B. Watts
C. Ohms ✓
D. Siemens
5. Power (Watts) is calculated by:
A. P = R × V
B. P = V × I ✓
, C. P = I ÷ R
D. P = V ÷ R
6. What type of current changes direction periodically?
A. DC
B. AC ✓
C. Static
D. Pulsating
7. Which particle has a negative charge?
A. Proton
B. Electron ✓
C. Neutron
D. Photon
8. A conductor with lower resistance is usually:
A. Longer and thinner
B. Shorter and thicker ✓
C. Insulated
D. Magnetic
9. The opposition to current flow in AC circuits caused by inductors/capacitors is:
A. Resistance
B. Reactance ✓
C. Inductance
D. Capacitance
10. Total resistance in series circuits is:
A. The sum of all resistances ✓
B. The lowest resistance
C. Equal to one resistor only
D. Always zero
11. Voltage drop occurs due to:
A. Poor grounding
B. Wire length and resistance ✓
C. Panel type
D. Conduit size
12. The unit of electrical power is:
A. Volt
, B. Watt ✓
C. Amp
D. Joule
13. Capacitors store energy in the form of:
A. Magnetism
B. Electric fields ✓
C. Heat
D. Pressure
14. Inductors store energy in the form of:
A. Magnetic fields ✓
B. Voltage
C. Resistance
D. Capacitance
15. The symbol Ω represents:
A. Resistance ✓
B. Current
C. Inductance
D. Voltage
16. A short circuit occurs when:
A. Current takes an unintended low-resistance path ✓
B. Voltage is too high
C. Frequency changes
D. Load increases
17. A GFCI protects against:
A. Ground faults ✓
B. Overloads
C. Surge voltage
D. Harmonics
18. What is Kirchhoff’s Current Law?
A. Sum of currents entering equals sum leaving ✓
B. Voltage equals resistance times current
C. Energy cannot be destroyed
D. Reactance equals impedance
, 19. Impedance is the combination of:
A. Resistance only
B. Reactance only
C. Resistance + Reactance ✓
D. Voltage + Current
20. Which conductor material offers the lowest resistance?
A. Iron
B. Copper ✓
C. Aluminum
D. Brass
SECTION 2 — NATIONAL ELECTRICAL CODE (NEC) (21–40)
21. The NEC is updated every:
A. 2 years
B. 3 years ✓
C. 5 years
D. 10 years
22. NEC Article 250 covers:
A. Wire color codes
B. Grounding and Bonding ✓
C. Motors
D. Transformers
23. NEC Article 430 covers:
A. Lighting
B. Motors ✓
C. PV systems
D. Services
24. Minimum burial depth for PVC conduit (0–600V) is:
A. 6"
B. 12"
C. 18" ✓
D. 30"
2026
100 Practice Questions & Answers (Well-
Structured, Latest Edition)
SECTION 1 — BASIC ELECTRICAL THEORY (1–20)
1. What is the unit of electrical current?
A. Volt
B. Ampere ✓
C. Ohm
D. Watt
2. Which law states that voltage = current × resistance?
A. Kirchhoff’s Law
B. Ohm’s Law ✓
C. Faraday’s Law
D. Coulomb’s Law
3. What is the standard frequency of AC power in the U.S.?
A. 25 Hz
B. 60 Hz ✓
C. 50 Hz
D. 100 Hz
4. Resistance is measured in:
A. Volts
B. Watts
C. Ohms ✓
D. Siemens
5. Power (Watts) is calculated by:
A. P = R × V
B. P = V × I ✓
, C. P = I ÷ R
D. P = V ÷ R
6. What type of current changes direction periodically?
A. DC
B. AC ✓
C. Static
D. Pulsating
7. Which particle has a negative charge?
A. Proton
B. Electron ✓
C. Neutron
D. Photon
8. A conductor with lower resistance is usually:
A. Longer and thinner
B. Shorter and thicker ✓
C. Insulated
D. Magnetic
9. The opposition to current flow in AC circuits caused by inductors/capacitors is:
A. Resistance
B. Reactance ✓
C. Inductance
D. Capacitance
10. Total resistance in series circuits is:
A. The sum of all resistances ✓
B. The lowest resistance
C. Equal to one resistor only
D. Always zero
11. Voltage drop occurs due to:
A. Poor grounding
B. Wire length and resistance ✓
C. Panel type
D. Conduit size
12. The unit of electrical power is:
A. Volt
, B. Watt ✓
C. Amp
D. Joule
13. Capacitors store energy in the form of:
A. Magnetism
B. Electric fields ✓
C. Heat
D. Pressure
14. Inductors store energy in the form of:
A. Magnetic fields ✓
B. Voltage
C. Resistance
D. Capacitance
15. The symbol Ω represents:
A. Resistance ✓
B. Current
C. Inductance
D. Voltage
16. A short circuit occurs when:
A. Current takes an unintended low-resistance path ✓
B. Voltage is too high
C. Frequency changes
D. Load increases
17. A GFCI protects against:
A. Ground faults ✓
B. Overloads
C. Surge voltage
D. Harmonics
18. What is Kirchhoff’s Current Law?
A. Sum of currents entering equals sum leaving ✓
B. Voltage equals resistance times current
C. Energy cannot be destroyed
D. Reactance equals impedance
, 19. Impedance is the combination of:
A. Resistance only
B. Reactance only
C. Resistance + Reactance ✓
D. Voltage + Current
20. Which conductor material offers the lowest resistance?
A. Iron
B. Copper ✓
C. Aluminum
D. Brass
SECTION 2 — NATIONAL ELECTRICAL CODE (NEC) (21–40)
21. The NEC is updated every:
A. 2 years
B. 3 years ✓
C. 5 years
D. 10 years
22. NEC Article 250 covers:
A. Wire color codes
B. Grounding and Bonding ✓
C. Motors
D. Transformers
23. NEC Article 430 covers:
A. Lighting
B. Motors ✓
C. PV systems
D. Services
24. Minimum burial depth for PVC conduit (0–600V) is:
A. 6"
B. 12"
C. 18" ✓
D. 30"
