2026 LINEMAN CERTIFICATION PRACTICE
EXAM — Multiple-Choice Questions with Answers &
Rationales
Electrical Theory & Safety
1. What is the unit of electrical current?
A. Volt
B. Ampere
C. Ohm
D. Watt
Answer: B. Ampere
An ampere (amp) measures the flow of electric charge through a circuit.
2. What instrument is used to measure voltage?
A. Ammeter
B. Ohmmeter
C. Voltmeter
D. Wattmeter
Answer: C. Voltmeter
A voltmeter measures the electrical potential difference between two points.
3. Ohm's Law is expressed as:
A. P = VI
B. V = IR
C. I = VR
D. R = VI
,Answer: B. V = IR
Ohm's Law states that voltage equals current multiplied by resistance.
4. If voltage is 120 V and resistance is 20 Ω, what is the current?
A. 2 A
B. 4 A
C. 6 A
D. 10 A
Answer: C. 6 A
Using I = V/R, 120 ÷ 20 = 6 amperes.
5. What is the unit of resistance?
A. Watt
B. Volt
C. Ampere
D. Ohm
Answer: D. Ohm
Resistance is measured in ohms (Ω), which indicate opposition to current flow.
6. What happens to current when resistance increases while voltage remains
constant?
A. Current increases
B. Current decreases
C. Current becomes zero
D. Voltage increases
Answer: B. Current decreases
According to Ohm's Law, current is inversely proportional to resistance when voltage is
constant.
7. What is the primary purpose of a fuse?
A. Increase voltage
,B. Store electricity
C. Protect against excessive current
D. Improve power factor
Answer: C. Protect against excessive current
A fuse opens the circuit when current exceeds its rated value, helping prevent equipment
damage and fires.
8. Which material is commonly used as an electrical conductor?
A. Rubber
B. Glass
C. Copper
D. Wood
Answer: C. Copper
Copper has high electrical conductivity and is widely used for electrical conductors.
9. Which material is an electrical insulator?
A. Copper
B. Aluminum
C. Steel
D. Rubber
Answer: D. Rubber
Rubber has high electrical resistance and is commonly used to insulate
electrical equipment.
10. What does AC stand for?
A. Automatic Current
B. Alternating Current
C. Applied Current
D. Active Circuit
, Answer: B. Alternating Current
Alternating current periodically changes direction and is commonly used in power
distribution.
11. What does DC stand for?
A. Direct Current
B. Distributed Current
C. Double Circuit
D. Digital Current
Answer: A. Direct Current
Direct current flows primarily in one direction.
12. What is electrical power measured in?
A. Ohms
B. Amperes
C. Watts
D. Volts
Answer: C. Watts
The watt is the SI unit used to measure electrical power.
13. Which formula calculates electrical power?
A. P = VI
B. P = R/I
C. P = V/R
D. P = I/V
Answer: A. P = VI
Electrical power equals voltage multiplied by current.
14. A circuit has 240 V and 10 A. What is the power?
A. 24 W
B. 240 W
EXAM — Multiple-Choice Questions with Answers &
Rationales
Electrical Theory & Safety
1. What is the unit of electrical current?
A. Volt
B. Ampere
C. Ohm
D. Watt
Answer: B. Ampere
An ampere (amp) measures the flow of electric charge through a circuit.
2. What instrument is used to measure voltage?
A. Ammeter
B. Ohmmeter
C. Voltmeter
D. Wattmeter
Answer: C. Voltmeter
A voltmeter measures the electrical potential difference between two points.
3. Ohm's Law is expressed as:
A. P = VI
B. V = IR
C. I = VR
D. R = VI
,Answer: B. V = IR
Ohm's Law states that voltage equals current multiplied by resistance.
4. If voltage is 120 V and resistance is 20 Ω, what is the current?
A. 2 A
B. 4 A
C. 6 A
D. 10 A
Answer: C. 6 A
Using I = V/R, 120 ÷ 20 = 6 amperes.
5. What is the unit of resistance?
A. Watt
B. Volt
C. Ampere
D. Ohm
Answer: D. Ohm
Resistance is measured in ohms (Ω), which indicate opposition to current flow.
6. What happens to current when resistance increases while voltage remains
constant?
A. Current increases
B. Current decreases
C. Current becomes zero
D. Voltage increases
Answer: B. Current decreases
According to Ohm's Law, current is inversely proportional to resistance when voltage is
constant.
7. What is the primary purpose of a fuse?
A. Increase voltage
,B. Store electricity
C. Protect against excessive current
D. Improve power factor
Answer: C. Protect against excessive current
A fuse opens the circuit when current exceeds its rated value, helping prevent equipment
damage and fires.
8. Which material is commonly used as an electrical conductor?
A. Rubber
B. Glass
C. Copper
D. Wood
Answer: C. Copper
Copper has high electrical conductivity and is widely used for electrical conductors.
9. Which material is an electrical insulator?
A. Copper
B. Aluminum
C. Steel
D. Rubber
Answer: D. Rubber
Rubber has high electrical resistance and is commonly used to insulate
electrical equipment.
10. What does AC stand for?
A. Automatic Current
B. Alternating Current
C. Applied Current
D. Active Circuit
, Answer: B. Alternating Current
Alternating current periodically changes direction and is commonly used in power
distribution.
11. What does DC stand for?
A. Direct Current
B. Distributed Current
C. Double Circuit
D. Digital Current
Answer: A. Direct Current
Direct current flows primarily in one direction.
12. What is electrical power measured in?
A. Ohms
B. Amperes
C. Watts
D. Volts
Answer: C. Watts
The watt is the SI unit used to measure electrical power.
13. Which formula calculates electrical power?
A. P = VI
B. P = R/I
C. P = V/R
D. P = I/V
Answer: A. P = VI
Electrical power equals voltage multiplied by current.
14. A circuit has 240 V and 10 A. What is the power?
A. 24 W
B. 240 W
