Kansas Electrical Contractor
Examination Questions And Correct
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Rationales 2026 Q&A | Instant
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General Electrical Knowledge and Theory
1. What is the primary relationship expressed by Ohm’s Law?
A. Power equals voltage multiplied by resistance
B. Current equals voltage divided by resistance
C. Resistance equals current divided by voltage
D. Voltage equals power divided by resistance
Answer: B. Current equals voltage divided by resistance
Rationale: Ohm’s Law states that I = E/R, meaning current equals
voltage divided by resistance. Increasing voltage while resistance
remains constant increases current.
2. A 120-volt circuit has a resistance of 20 ohms. Approximately how
much current flows?
A. 2 A
B. 6 A
C. 20 A
D. 24 A
Answer: B. 6 A
,Rationale: Using I = E/R, 120 volts divided by 20 ohms equals 6
amperes.
3. What happens to current when resistance increases while voltage
remains constant?
A. Current increases
B. Current becomes zero
C. Current decreases
D. Current becomes alternating
Answer: C. Current decreases
Rationale: Ohm’s Law shows that current and resistance are inversely
related when voltage is constant.
4. Which formula is used to calculate electrical power in a DC
circuit?
A. P = R/I
B. P = E/R
C. P = E × I
D. P = I/R
Answer: C. P = E × I
Rationale: Electrical power in watts is calculated by multiplying
voltage in volts by current in amperes.
5. A 120-volt load draws 10 amperes. What is its approximate power
consumption?
A. 12 W
B. 120 W
C. 1,200 W
D. 12,000 W
,Answer: C. 1,200 W
Rationale: Power equals voltage multiplied by current: 120 × 10 =
1,200 watts.
6. In a series circuit, which characteristic is common to all loads?
A. Voltage is always identical across each load
B. Current is the same through each load
C. Resistance is always zero
D. Power factor is always unity
Answer: B. Current is the same through each load
Rationale: A series circuit provides one current path, so the same
current flows through every series component.
7. In a parallel circuit, each branch is normally subjected to what
condition?
A. The same current
B. The same voltage
C. The same resistance
D. Zero voltage
Answer: B. The same voltage
Rationale: Parallel branches connect across the same two points, so the
voltage across each branch is the same.
8. What is the primary purpose of a transformer?
A. To convert AC into mechanical energy
B. To change AC voltage levels
C. To increase conductor resistance
D. To eliminate all current
Answer: B. To change AC voltage levels
, Rationale: Transformers transfer electrical energy between windings
and can step voltage up or down while operating on alternating
current.
9. What type of current periodically reverses direction?
A. Direct current
B. Alternating current
C. Leakage current only
D. Static current
Answer: B. Alternating current
Rationale: Alternating current periodically changes magnitude and
direction, unlike direct current, which flows in one primary direction.
10. What unit is used to measure frequency?
A. Volt
B. Ampere
C. Hertz
D. Ohm
Answer: C. Hertz
Rationale: Frequency is measured in hertz, with one hertz representing
one cycle per second.
11. What is the approximate frequency of standard utility power
in the United States?
A. 25 Hz
B. 60 Hz
C. 90 Hz
D. 120 Hz
Answer: B. 60 Hz
Examination Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
General Electrical Knowledge and Theory
1. What is the primary relationship expressed by Ohm’s Law?
A. Power equals voltage multiplied by resistance
B. Current equals voltage divided by resistance
C. Resistance equals current divided by voltage
D. Voltage equals power divided by resistance
Answer: B. Current equals voltage divided by resistance
Rationale: Ohm’s Law states that I = E/R, meaning current equals
voltage divided by resistance. Increasing voltage while resistance
remains constant increases current.
2. A 120-volt circuit has a resistance of 20 ohms. Approximately how
much current flows?
A. 2 A
B. 6 A
C. 20 A
D. 24 A
Answer: B. 6 A
,Rationale: Using I = E/R, 120 volts divided by 20 ohms equals 6
amperes.
3. What happens to current when resistance increases while voltage
remains constant?
A. Current increases
B. Current becomes zero
C. Current decreases
D. Current becomes alternating
Answer: C. Current decreases
Rationale: Ohm’s Law shows that current and resistance are inversely
related when voltage is constant.
4. Which formula is used to calculate electrical power in a DC
circuit?
A. P = R/I
B. P = E/R
C. P = E × I
D. P = I/R
Answer: C. P = E × I
Rationale: Electrical power in watts is calculated by multiplying
voltage in volts by current in amperes.
5. A 120-volt load draws 10 amperes. What is its approximate power
consumption?
A. 12 W
B. 120 W
C. 1,200 W
D. 12,000 W
,Answer: C. 1,200 W
Rationale: Power equals voltage multiplied by current: 120 × 10 =
1,200 watts.
6. In a series circuit, which characteristic is common to all loads?
A. Voltage is always identical across each load
B. Current is the same through each load
C. Resistance is always zero
D. Power factor is always unity
Answer: B. Current is the same through each load
Rationale: A series circuit provides one current path, so the same
current flows through every series component.
7. In a parallel circuit, each branch is normally subjected to what
condition?
A. The same current
B. The same voltage
C. The same resistance
D. Zero voltage
Answer: B. The same voltage
Rationale: Parallel branches connect across the same two points, so the
voltage across each branch is the same.
8. What is the primary purpose of a transformer?
A. To convert AC into mechanical energy
B. To change AC voltage levels
C. To increase conductor resistance
D. To eliminate all current
Answer: B. To change AC voltage levels
, Rationale: Transformers transfer electrical energy between windings
and can step voltage up or down while operating on alternating
current.
9. What type of current periodically reverses direction?
A. Direct current
B. Alternating current
C. Leakage current only
D. Static current
Answer: B. Alternating current
Rationale: Alternating current periodically changes magnitude and
direction, unlike direct current, which flows in one primary direction.
10. What unit is used to measure frequency?
A. Volt
B. Ampere
C. Hertz
D. Ohm
Answer: C. Hertz
Rationale: Frequency is measured in hertz, with one hertz representing
one cycle per second.
11. What is the approximate frequency of standard utility power
in the United States?
A. 25 Hz
B. 60 Hz
C. 90 Hz
D. 120 Hz
Answer: B. 60 Hz
