OHIO ELECTRICAL CONTRACTOR EXAM QUESTIONS
AND CORRECT ANSWERS (VERIFIED ANSWERS)
Q&A 2026/2027 |INSTANT DOWNLOAD PDF
1. What is the basic unit used to measure electrical
resistance?
A. Volt
B. Ampere
C. Ohm
D. Watt
Correct Answer: C. Ohm
Rationale: Resistance is measured in ohms (Ω) and represents
the opposition a material provides to current flow.
2. Which formula represents Ohm’s Law?
A. P = I × R
B. V = I × R
C. R = P × V
D. I = V × P
Correct Answer: B. V = I × R
Rationale: Ohm’s Law states that voltage equals current
multiplied by resistance.
,3. The National Electrical Code (NEC) is primarily used to:
A. Set equipment prices
B. Provide electrical installation safety standards
C. Train electricians
D. Replace local building codes
Correct Answer: B. Provide electrical installation safety
standards
Rationale: The NEC establishes minimum requirements for safe
electrical installations.
4. Which device is designed to protect against excessive
current flow?
A. Transformer
B. Fuse or circuit breaker
C. Receptacle
D. Junction box
Correct Answer: B. Fuse or circuit breaker
Rationale: Overcurrent protection devices open the circuit
when current exceeds safe limits.
5. Electrical power is measured in which unit?
A. Ohms
B. Watts
,C. Volts
D. Amperes
Correct Answer: B. Watts
Rationale: Watts measure the rate at which electrical energy is
consumed.
6. What is the purpose of grounding an electrical system?
A. Increase voltage
B. Provide a safe path for fault current
C. Reduce wire size
D. Increase resistance
Correct Answer: B. Provide a safe path for fault current
Rationale: Grounding helps protect people and equipment by
allowing fault current to return safely.
7. Which conductor normally carries current back to the
source in a single-phase system?
A. Grounding conductor
B. Neutral conductor
C. Bonding jumper
D. Equipment grounding conductor
Correct Answer: B. Neutral conductor
, Rationale: The neutral conductor is the grounded conductor
that completes the circuit.
8. What color insulation is commonly used for equipment
grounding conductors?
A. White
B. Black
C. Green or bare copper
D. Red
Correct Answer: C. Green or bare copper
Rationale: NEC identifies grounding conductors using green
insulation or bare copper.
9. A circuit breaker is designed to:
A. Increase electrical load
B. Interrupt abnormal current conditions
C. Reduce voltage
D. Store electrical energy
Correct Answer: B. Interrupt abnormal current conditions
Rationale: Circuit breakers protect wiring and equipment from
overloads and short circuits.
10. Which instrument measures electrical voltage?
AND CORRECT ANSWERS (VERIFIED ANSWERS)
Q&A 2026/2027 |INSTANT DOWNLOAD PDF
1. What is the basic unit used to measure electrical
resistance?
A. Volt
B. Ampere
C. Ohm
D. Watt
Correct Answer: C. Ohm
Rationale: Resistance is measured in ohms (Ω) and represents
the opposition a material provides to current flow.
2. Which formula represents Ohm’s Law?
A. P = I × R
B. V = I × R
C. R = P × V
D. I = V × P
Correct Answer: B. V = I × R
Rationale: Ohm’s Law states that voltage equals current
multiplied by resistance.
,3. The National Electrical Code (NEC) is primarily used to:
A. Set equipment prices
B. Provide electrical installation safety standards
C. Train electricians
D. Replace local building codes
Correct Answer: B. Provide electrical installation safety
standards
Rationale: The NEC establishes minimum requirements for safe
electrical installations.
4. Which device is designed to protect against excessive
current flow?
A. Transformer
B. Fuse or circuit breaker
C. Receptacle
D. Junction box
Correct Answer: B. Fuse or circuit breaker
Rationale: Overcurrent protection devices open the circuit
when current exceeds safe limits.
5. Electrical power is measured in which unit?
A. Ohms
B. Watts
,C. Volts
D. Amperes
Correct Answer: B. Watts
Rationale: Watts measure the rate at which electrical energy is
consumed.
6. What is the purpose of grounding an electrical system?
A. Increase voltage
B. Provide a safe path for fault current
C. Reduce wire size
D. Increase resistance
Correct Answer: B. Provide a safe path for fault current
Rationale: Grounding helps protect people and equipment by
allowing fault current to return safely.
7. Which conductor normally carries current back to the
source in a single-phase system?
A. Grounding conductor
B. Neutral conductor
C. Bonding jumper
D. Equipment grounding conductor
Correct Answer: B. Neutral conductor
, Rationale: The neutral conductor is the grounded conductor
that completes the circuit.
8. What color insulation is commonly used for equipment
grounding conductors?
A. White
B. Black
C. Green or bare copper
D. Red
Correct Answer: C. Green or bare copper
Rationale: NEC identifies grounding conductors using green
insulation or bare copper.
9. A circuit breaker is designed to:
A. Increase electrical load
B. Interrupt abnormal current conditions
C. Reduce voltage
D. Store electrical energy
Correct Answer: B. Interrupt abnormal current conditions
Rationale: Circuit breakers protect wiring and equipment from
overloads and short circuits.
10. Which instrument measures electrical voltage?
