Kansas Journeyman Electrician
Examination Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. What is the primary purpose of a circuit breaker in an electrical
distribution system?
A. To increase circuit voltage
B. To provide overcurrent protection
C. To reduce conductor resistance
D. To improve power factor
Answer: B. To provide overcurrent protection
Rationale: A circuit breaker is designed to interrupt current when an
overcurrent condition such as an overload or short circuit occurs. This
protects conductors and equipment from excessive heating and
potential fire hazards.
2. Which unit is used to measure electrical current?
A. Volt
B. Ohm
C. Ampere
D. Watt
Answer: C. Ampere
,Rationale: The ampere, commonly called an amp, is the unit of
electrical current. Voltage is measured in volts, resistance in ohms,
and power in watts.
3. Which formula correctly expresses Ohm's law?
A. P = I²R
B. E = IR
C. P = E/I
D. R = EI
Answer: B. E = IR
Rationale: Ohm's law states that voltage equals current multiplied by
resistance. The relationship can also be rearranged as I = E/R or R =
E/I.
4. A 120-volt circuit supplies a 10-ohm resistance. What current
flows through the resistance?
A. 6 A
B. 10 A
C. 12 A
D. 120 A
Answer: C. 12 A
Rationale: Using Ohm's law, I = E/R. Dividing 120 volts by 10 ohms
gives 12 amperes.
5. What is the unit of electrical resistance?
A. Watt
B. Ohm
C. Ampere
D. Volt
,Answer: B. Ohm
Rationale: Electrical resistance is measured in ohms. Resistance
opposes the flow of electric current through a circuit.
6. What is the formula for electrical power in a DC circuit?
A. P = EI
B. P = E/R
C. P = R/I
D. P = I/R
Answer: A. P = EI
Rationale: Electrical power in watts equals voltage in volts multiplied
by current in amperes. Other equivalent power formulas can be
derived using Ohm's law.
7. A 120-volt load draws 5 amperes. What is its power consumption?
A. 24 W
B. 125 W
C. 600 W
D. 1,200 W
Answer: C. 600 W
Rationale: Power is calculated as P = EI. Multiplying 120 volts by 5
amperes produces 600 watts.
8. What happens to conductor resistance as conductor length
increases, assuming all other characteristics remain constant?
A. Resistance decreases
B. Resistance increases
C. Resistance becomes zero
D. Resistance is unaffected
, Answer: B. Resistance increases
Rationale: A longer conductor has greater resistance because current
must travel through more conductive material. Conductor size,
material, temperature, and length all affect resistance.
9. What happens to conductor resistance when conductor cross-
sectional area increases?
A. Resistance increases
B. Resistance decreases
C. Resistance becomes infinite
D. Voltage automatically increases
Answer: B. Resistance decreases
Rationale: A larger conductor provides more area for current flow and
therefore has lower resistance than a smaller conductor of the same
material and length.
10. Which material is commonly used for electrical conductors
because of its high conductivity?
A. Copper
B. Glass
C. Rubber
D. Wood
Answer: A. Copper
Rationale: Copper has excellent electrical conductivity, is mechanically
workable, and is widely used for building wiring. Aluminum is also
commonly used for certain electrical conductors.
11. What is the purpose of insulation on an electrical conductor?
Examination Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of a circuit breaker in an electrical
distribution system?
A. To increase circuit voltage
B. To provide overcurrent protection
C. To reduce conductor resistance
D. To improve power factor
Answer: B. To provide overcurrent protection
Rationale: A circuit breaker is designed to interrupt current when an
overcurrent condition such as an overload or short circuit occurs. This
protects conductors and equipment from excessive heating and
potential fire hazards.
2. Which unit is used to measure electrical current?
A. Volt
B. Ohm
C. Ampere
D. Watt
Answer: C. Ampere
,Rationale: The ampere, commonly called an amp, is the unit of
electrical current. Voltage is measured in volts, resistance in ohms,
and power in watts.
3. Which formula correctly expresses Ohm's law?
A. P = I²R
B. E = IR
C. P = E/I
D. R = EI
Answer: B. E = IR
Rationale: Ohm's law states that voltage equals current multiplied by
resistance. The relationship can also be rearranged as I = E/R or R =
E/I.
4. A 120-volt circuit supplies a 10-ohm resistance. What current
flows through the resistance?
A. 6 A
B. 10 A
C. 12 A
D. 120 A
Answer: C. 12 A
Rationale: Using Ohm's law, I = E/R. Dividing 120 volts by 10 ohms
gives 12 amperes.
5. What is the unit of electrical resistance?
A. Watt
B. Ohm
C. Ampere
D. Volt
,Answer: B. Ohm
Rationale: Electrical resistance is measured in ohms. Resistance
opposes the flow of electric current through a circuit.
6. What is the formula for electrical power in a DC circuit?
A. P = EI
B. P = E/R
C. P = R/I
D. P = I/R
Answer: A. P = EI
Rationale: Electrical power in watts equals voltage in volts multiplied
by current in amperes. Other equivalent power formulas can be
derived using Ohm's law.
7. A 120-volt load draws 5 amperes. What is its power consumption?
A. 24 W
B. 125 W
C. 600 W
D. 1,200 W
Answer: C. 600 W
Rationale: Power is calculated as P = EI. Multiplying 120 volts by 5
amperes produces 600 watts.
8. What happens to conductor resistance as conductor length
increases, assuming all other characteristics remain constant?
A. Resistance decreases
B. Resistance increases
C. Resistance becomes zero
D. Resistance is unaffected
, Answer: B. Resistance increases
Rationale: A longer conductor has greater resistance because current
must travel through more conductive material. Conductor size,
material, temperature, and length all affect resistance.
9. What happens to conductor resistance when conductor cross-
sectional area increases?
A. Resistance increases
B. Resistance decreases
C. Resistance becomes infinite
D. Voltage automatically increases
Answer: B. Resistance decreases
Rationale: A larger conductor provides more area for current flow and
therefore has lower resistance than a smaller conductor of the same
material and length.
10. Which material is commonly used for electrical conductors
because of its high conductivity?
A. Copper
B. Glass
C. Rubber
D. Wood
Answer: A. Copper
Rationale: Copper has excellent electrical conductivity, is mechanically
workable, and is widely used for building wiring. Aluminum is also
commonly used for certain electrical conductors.
11. What is the purpose of insulation on an electrical conductor?
