Louisiana Electrical Contractor
Examination Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of an electrical circuit overcurrent
protective device?
A. To increase circuit voltage
B. To prevent all electrical shocks
C. To protect conductors and equipment from excessive current
D. To improve power factor
Answer: C. To protect conductors and equipment from excessive
current
Rationale: Overcurrent devices such as circuit breakers and fuses are
intended primarily to protect conductors and equipment from damage
caused by excessive current. They are not substitutes for grounding or
shock protection.
2. Which unit is used to measure electrical resistance?
A. Volt
B. Ampere
C. Watt
D. Ohm
Answer: D. Ohm
,Rationale: Electrical resistance is measured in ohms. Voltage is
measured in volts, current in amperes, and power in watts.
3. Which formula represents Ohm's Law?
A. P = I/R
B. V = I × R
C. R = V × I
D. I = V × R
Answer: B. V = I × R
Rationale: Ohm's Law states that voltage equals current multiplied by
resistance. The relationship can also be rearranged to calculate
current or resistance.
4. A 120-volt circuit has a resistance of 20 ohms. Approximately how
much current flows?
A. 2 A
B. 4 A
C. 6 A
D. 20 A
Answer: C. 6 A
Rationale: Using I = V/R, the current is 120 ÷ 20 = 6 amperes.
5. What is the electrical power of a 120-volt load drawing 10
amperes?
A. 12 W
B. 120 W
C. 1,200 W
D. 12,000 W
Answer: C. 1,200 W
,Rationale: Electrical power is calculated using P = V × I. Therefore,
120 × 10 equals 1,200 watts.
6. In a typical grounded 120/240-volt single-phase system, the
grounded conductor is commonly called the:
A. Equipment grounding conductor
B. Bonding jumper
C. Neutral conductor
D. Phase conductor
Answer: C. Neutral conductor
Rationale: The grounded circuit conductor is commonly referred to as
the neutral in a typical single-phase system. It carries unbalanced
current in multiwire circuits.
7. What is the main function of an equipment grounding conductor?
A. Carry normal load current
B. Increase circuit voltage
C. Provide a low-impedance path for fault current
D. Reduce energy consumption
Answer: C. Provide a low-impedance path for fault current
Rationale: The equipment grounding conductor provides a fault-
current path that helps operate the overcurrent protective device when
a fault energizes normally non-current-carrying metal parts.
8. Which material is commonly used for electrical conductors?
A. Concrete
B. PVC
C. Copper
D. Glass
, Answer: C. Copper
Rationale: Copper is widely used because it has excellent conductivity,
good mechanical properties, and relatively high resistance to
corrosion. Aluminum is also commonly used for larger conductors.
9. What happens to conductor resistance as conductor length
increases, assuming all other factors remain constant?
A. It decreases
B. It becomes zero
C. It increases
D. It remains unchanged
Answer: C. It increases
Rationale: Resistance is directly proportional to conductor length.
Longer conductors generally have greater resistance and therefore
greater voltage drop.
10. What happens to conductor resistance when conductor cross-
sectional area increases?
A. Resistance increases
B. Resistance decreases
C. Voltage doubles
D. Current becomes zero
Answer: B. Resistance decreases
Rationale: Resistance is inversely proportional to conductor cross-
sectional area. A larger conductor provides more conductive material
and generally has lower resistance.
11. What is the purpose of a circuit breaker?
Examination Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of an electrical circuit overcurrent
protective device?
A. To increase circuit voltage
B. To prevent all electrical shocks
C. To protect conductors and equipment from excessive current
D. To improve power factor
Answer: C. To protect conductors and equipment from excessive
current
Rationale: Overcurrent devices such as circuit breakers and fuses are
intended primarily to protect conductors and equipment from damage
caused by excessive current. They are not substitutes for grounding or
shock protection.
2. Which unit is used to measure electrical resistance?
A. Volt
B. Ampere
C. Watt
D. Ohm
Answer: D. Ohm
,Rationale: Electrical resistance is measured in ohms. Voltage is
measured in volts, current in amperes, and power in watts.
3. Which formula represents Ohm's Law?
A. P = I/R
B. V = I × R
C. R = V × I
D. I = V × R
Answer: B. V = I × R
Rationale: Ohm's Law states that voltage equals current multiplied by
resistance. The relationship can also be rearranged to calculate
current or resistance.
4. A 120-volt circuit has a resistance of 20 ohms. Approximately how
much current flows?
A. 2 A
B. 4 A
C. 6 A
D. 20 A
Answer: C. 6 A
Rationale: Using I = V/R, the current is 120 ÷ 20 = 6 amperes.
5. What is the electrical power of a 120-volt load drawing 10
amperes?
A. 12 W
B. 120 W
C. 1,200 W
D. 12,000 W
Answer: C. 1,200 W
,Rationale: Electrical power is calculated using P = V × I. Therefore,
120 × 10 equals 1,200 watts.
6. In a typical grounded 120/240-volt single-phase system, the
grounded conductor is commonly called the:
A. Equipment grounding conductor
B. Bonding jumper
C. Neutral conductor
D. Phase conductor
Answer: C. Neutral conductor
Rationale: The grounded circuit conductor is commonly referred to as
the neutral in a typical single-phase system. It carries unbalanced
current in multiwire circuits.
7. What is the main function of an equipment grounding conductor?
A. Carry normal load current
B. Increase circuit voltage
C. Provide a low-impedance path for fault current
D. Reduce energy consumption
Answer: C. Provide a low-impedance path for fault current
Rationale: The equipment grounding conductor provides a fault-
current path that helps operate the overcurrent protective device when
a fault energizes normally non-current-carrying metal parts.
8. Which material is commonly used for electrical conductors?
A. Concrete
B. PVC
C. Copper
D. Glass
, Answer: C. Copper
Rationale: Copper is widely used because it has excellent conductivity,
good mechanical properties, and relatively high resistance to
corrosion. Aluminum is also commonly used for larger conductors.
9. What happens to conductor resistance as conductor length
increases, assuming all other factors remain constant?
A. It decreases
B. It becomes zero
C. It increases
D. It remains unchanged
Answer: C. It increases
Rationale: Resistance is directly proportional to conductor length.
Longer conductors generally have greater resistance and therefore
greater voltage drop.
10. What happens to conductor resistance when conductor cross-
sectional area increases?
A. Resistance increases
B. Resistance decreases
C. Voltage doubles
D. Current becomes zero
Answer: B. Resistance decreases
Rationale: Resistance is inversely proportional to conductor cross-
sectional area. A larger conductor provides more conductive material
and generally has lower resistance.
11. What is the purpose of a circuit breaker?
