NCCER ELECTRICAL LEVEL 4 CERTIFICATION EXAM
QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) Q&A 2026|INSTANT DOWNLOAD PDF
1. Ohm’s Law defines the relationship between voltage,
current, and resistance. Which equation correctly states this
law?
A. V = I × R
B. C. V = I × R
C. R = V × I
D. I = V + R
Rationale: Ohm’s Law states voltage equals current times
resistance.
2. What is the unit of electrical resistance?
A. Volt
B. Ampere
C. D. Ohm
D. Watt
Rationale: Resistance is measured in ohms (Ω).
3. A conductor has a current of 2 A and a resistance of 5 Ω.
What is the voltage?
,A. 10 V
B. B. 10 V
C. 7 V
D. 3 V
Rationale: V = I × R = 2 × 5 = 10 V.
4. Which device protects a circuit from overload by melting a
wire or strip?
A. Circuit breaker
B. Transistor
C. C. Fuse
D. Transformer
Rationale: Fuses melt at a set current to break the circuit.
5. Which is a parallel circuit characteristic?
A. Same current through each component
B. B. Same voltage across each branch
C. Current splits equally always
D. One path only
Rationale: Parallel circuits share voltage.
6. What is inductance?
A. Resistance to current change
B. Ability to store charge
,C. C. Property that opposes change in current
D. Power loss in conductor
Rationale: Inductance opposes changes in current flow.
7. Which is the correct unit for capacitance?
A. Farad
B. Ohm
C. C. Farad
D. Henry
Rationale: Capacitance is measured in farads (F).
8. A transformer increases voltage; it is called a:
A. Step-down transformer
B. Autotransformer
C. C. Step-up transformer
D. Isolation transformer
Rationale: Step-up transformers raise voltage.
9. In AC circuits, 90° phase difference between voltage and
current means the circuit is:
A. Resistive
B. Mixed
C. C. Purely inductive or capacitive
, D. Open
Rationale: Inductive or capacitive reactance causes 90° shift.
10. Power factor is defined as:
A. I × R
B. V × I
C. C. Cosine of the phase angle between voltage and current
D. V/I
Rationale: Power factor = cos φ.
11. Which color code indicates a grounding conductor in the
U.S.?
A. Black
B. Red
C. C. Green or bare
D. White
Rationale: Green/bare is equipment ground.
12. A rheostat is used to:
A. Measure voltage
B. B. Vary current
C. Store energy
D. Rectify AC to DC
Rationale: Rheostats vary current in a circuit.
QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) Q&A 2026|INSTANT DOWNLOAD PDF
1. Ohm’s Law defines the relationship between voltage,
current, and resistance. Which equation correctly states this
law?
A. V = I × R
B. C. V = I × R
C. R = V × I
D. I = V + R
Rationale: Ohm’s Law states voltage equals current times
resistance.
2. What is the unit of electrical resistance?
A. Volt
B. Ampere
C. D. Ohm
D. Watt
Rationale: Resistance is measured in ohms (Ω).
3. A conductor has a current of 2 A and a resistance of 5 Ω.
What is the voltage?
,A. 10 V
B. B. 10 V
C. 7 V
D. 3 V
Rationale: V = I × R = 2 × 5 = 10 V.
4. Which device protects a circuit from overload by melting a
wire or strip?
A. Circuit breaker
B. Transistor
C. C. Fuse
D. Transformer
Rationale: Fuses melt at a set current to break the circuit.
5. Which is a parallel circuit characteristic?
A. Same current through each component
B. B. Same voltage across each branch
C. Current splits equally always
D. One path only
Rationale: Parallel circuits share voltage.
6. What is inductance?
A. Resistance to current change
B. Ability to store charge
,C. C. Property that opposes change in current
D. Power loss in conductor
Rationale: Inductance opposes changes in current flow.
7. Which is the correct unit for capacitance?
A. Farad
B. Ohm
C. C. Farad
D. Henry
Rationale: Capacitance is measured in farads (F).
8. A transformer increases voltage; it is called a:
A. Step-down transformer
B. Autotransformer
C. C. Step-up transformer
D. Isolation transformer
Rationale: Step-up transformers raise voltage.
9. In AC circuits, 90° phase difference between voltage and
current means the circuit is:
A. Resistive
B. Mixed
C. C. Purely inductive or capacitive
, D. Open
Rationale: Inductive or capacitive reactance causes 90° shift.
10. Power factor is defined as:
A. I × R
B. V × I
C. C. Cosine of the phase angle between voltage and current
D. V/I
Rationale: Power factor = cos φ.
11. Which color code indicates a grounding conductor in the
U.S.?
A. Black
B. Red
C. C. Green or bare
D. White
Rationale: Green/bare is equipment ground.
12. A rheostat is used to:
A. Measure voltage
B. B. Vary current
C. Store energy
D. Rectify AC to DC
Rationale: Rheostats vary current in a circuit.
