Electrical Trade Certification Study
Assessment Questions With Correct
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. What is the primary purpose of a circuit breaker?
A. Store electricity
B. Increase voltage
C. Protect against overloads and short circuits
D. Reduce resistance
Correct Answer: C
Rationale: Circuit breakers interrupt current flow during overloads
or faults to prevent damage or fire.
2. What unit is used to measure electrical resistance?
A. Volt
B. Ampere
C. Ohm
D. Watt
Correct Answer: C
Rationale: Resistance is measured in ohms (Ω).
3. Which law states V = I × R?
A. Ohm’s Law
B. Kirchhoff’s Law
C. Faraday’s Law
, D. Watt’s Law
Correct Answer: A
Rationale: Ohm’s Law defines the relationship between voltage,
current, and resistance.
4. What does a ground wire do?
A. Carries current normally
B. Provides a path for fault current
C. Increases voltage
D. Stores charge
Correct Answer: B
Rationale: Ground wires safely redirect fault current to earth.
5. What color is typically used for grounding conductors?
A. Red
B. Black
C. Green or bare copper
D. White
Correct Answer: C
Rationale: Ground conductors are green or bare copper.
6. What is current measured in?
A. Volts
B. Ohms
C. Watts
D. Amperes
Correct Answer: D
Rationale: Current is measured in amperes (amps).
7. A series circuit has:
A. Multiple paths for current
, B. One path for current
C. No resistance
D. Infinite voltage
Correct Answer: B
Rationale: Series circuits provide only one path for current flow.
8. Parallel circuits allow:
A. One path
B. Multiple paths
C. No current flow
D. Increased resistance only
Correct Answer: B
Rationale: Parallel circuits provide multiple current paths.
9. What tool is used to measure voltage?
A. Ohmmeter
B. Voltmeter
C. Ammeter
D. Clamp meter
Correct Answer: B
Rationale: Voltmeters measure electrical potential difference.
10. What does NEC stand for?
A. National Electric Code
B. National Energy Control
C. North Electrical Commission
D. Network Energy Code
Correct Answer: A
Rationale: NEC is the National Electrical Code.
Assessment Questions With Correct
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. What is the primary purpose of a circuit breaker?
A. Store electricity
B. Increase voltage
C. Protect against overloads and short circuits
D. Reduce resistance
Correct Answer: C
Rationale: Circuit breakers interrupt current flow during overloads
or faults to prevent damage or fire.
2. What unit is used to measure electrical resistance?
A. Volt
B. Ampere
C. Ohm
D. Watt
Correct Answer: C
Rationale: Resistance is measured in ohms (Ω).
3. Which law states V = I × R?
A. Ohm’s Law
B. Kirchhoff’s Law
C. Faraday’s Law
, D. Watt’s Law
Correct Answer: A
Rationale: Ohm’s Law defines the relationship between voltage,
current, and resistance.
4. What does a ground wire do?
A. Carries current normally
B. Provides a path for fault current
C. Increases voltage
D. Stores charge
Correct Answer: B
Rationale: Ground wires safely redirect fault current to earth.
5. What color is typically used for grounding conductors?
A. Red
B. Black
C. Green or bare copper
D. White
Correct Answer: C
Rationale: Ground conductors are green or bare copper.
6. What is current measured in?
A. Volts
B. Ohms
C. Watts
D. Amperes
Correct Answer: D
Rationale: Current is measured in amperes (amps).
7. A series circuit has:
A. Multiple paths for current
, B. One path for current
C. No resistance
D. Infinite voltage
Correct Answer: B
Rationale: Series circuits provide only one path for current flow.
8. Parallel circuits allow:
A. One path
B. Multiple paths
C. No current flow
D. Increased resistance only
Correct Answer: B
Rationale: Parallel circuits provide multiple current paths.
9. What tool is used to measure voltage?
A. Ohmmeter
B. Voltmeter
C. Ammeter
D. Clamp meter
Correct Answer: B
Rationale: Voltmeters measure electrical potential difference.
10. What does NEC stand for?
A. National Electric Code
B. National Energy Control
C. North Electrical Commission
D. Network Energy Code
Correct Answer: A
Rationale: NEC is the National Electrical Code.
