NEW JERSEY ELECTRICAL CONTRACTOR EXAM –
100 PRACTICE QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) Q&A
2026|INSTANT DOWNLOAD PDF
1. What is the unit of electrical resistance?
A. Volt
B. Ampere
C. Ohm
D. Watt
Rationale: Resistance is measured in ohms (Ω), which
represents the opposition to current flow.
2. Ohm’s Law states V = IR. If current doubles and resistance
stays constant, voltage will:
A. Stay the same
B. Double
C. Halve
D. Quadruple
Rationale: Voltage is directly proportional to current when
resistance is constant.
3. Which component stores energy in an electric field?
A. Inductor
B. Resistor
C. Transformer
D. Capacitor
, Rationale: Capacitors store energy as an electric field
between plates.
4. Which conductor color is typically used for grounding in
NEC?
A. Black
B. Red
C. Green or bare
D. Blue
Rationale: Green or bare conductors identify grounding
conductors.
5. Power in an AC circuit is the product of voltage, current,
and:
A. Resistance
B. Frequency
C. Power factor
D. Reactance
Rationale: Real power = Voltage × Current × Power Factor
(accounts for phase angle).
6. Which instrument measures current without breaking the
circuit?
A. Voltmeter
B. Clamp ammeter
C. Ohmmeter
D. Wattmeter
Rationale: Clamp meters measure current by sensing the
magnetic field around a conductor.
, 7. The purpose of a transformer is to:
A. Store energy
B. Rectify current
C. Change voltage levels
D. Increase resistance
Rationale: Transformers step voltage up or down in AC
circuits.
8. A single-phase AC supply has:
A. Two hot legs and a neutral
B. One hot leg and a neutral
C. Three hot legs
D. One hot leg and one ground only
Rationale: Single-phase residential circuits typically use
one hot and one neutral.
9. Frequency is measured in:
A. Ohms
B. Hertz
C. Volts
D. Joules
Rationale: Hertz (Hz) measures cycles per second.
10. A short circuit is best described as:
A. High resistance path
B. Low resistance fault path
C. Normal load path
D. Open circuit
100 PRACTICE QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) Q&A
2026|INSTANT DOWNLOAD PDF
1. What is the unit of electrical resistance?
A. Volt
B. Ampere
C. Ohm
D. Watt
Rationale: Resistance is measured in ohms (Ω), which
represents the opposition to current flow.
2. Ohm’s Law states V = IR. If current doubles and resistance
stays constant, voltage will:
A. Stay the same
B. Double
C. Halve
D. Quadruple
Rationale: Voltage is directly proportional to current when
resistance is constant.
3. Which component stores energy in an electric field?
A. Inductor
B. Resistor
C. Transformer
D. Capacitor
, Rationale: Capacitors store energy as an electric field
between plates.
4. Which conductor color is typically used for grounding in
NEC?
A. Black
B. Red
C. Green or bare
D. Blue
Rationale: Green or bare conductors identify grounding
conductors.
5. Power in an AC circuit is the product of voltage, current,
and:
A. Resistance
B. Frequency
C. Power factor
D. Reactance
Rationale: Real power = Voltage × Current × Power Factor
(accounts for phase angle).
6. Which instrument measures current without breaking the
circuit?
A. Voltmeter
B. Clamp ammeter
C. Ohmmeter
D. Wattmeter
Rationale: Clamp meters measure current by sensing the
magnetic field around a conductor.
, 7. The purpose of a transformer is to:
A. Store energy
B. Rectify current
C. Change voltage levels
D. Increase resistance
Rationale: Transformers step voltage up or down in AC
circuits.
8. A single-phase AC supply has:
A. Two hot legs and a neutral
B. One hot leg and a neutral
C. Three hot legs
D. One hot leg and one ground only
Rationale: Single-phase residential circuits typically use
one hot and one neutral.
9. Frequency is measured in:
A. Ohms
B. Hertz
C. Volts
D. Joules
Rationale: Hertz (Hz) measures cycles per second.
10. A short circuit is best described as:
A. High resistance path
B. Low resistance fault path
C. Normal load path
D. Open circuit
