MASTER ELECTRICIAN PRACTICE EXAM (100
QUESTIONS) With Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of grounding in an electrical system?
A. Increase voltage
B. Reduce resistance
C. Provide a fault current path
D. Store electrical energy
Answer: C. Provide a fault current path
Rationale: Grounding ensures a safe path for fault current to travel,
reducing shock and fire hazards.
2. Which code governs electrical installations in the United States?
A. OSHA
B. NEC
C. ANSI
D. NFPA 70E
Answer: B. NEC
Rationale: The National Electrical Code (NEC) sets the standard for safe
electrical design and installation.
,3. Ohm’s Law is expressed as:
A. V = IR
B. P = IV²
C. I = VR
D. R = VI
Answer: A. V = IR
Rationale: Ohm’s Law defines voltage as current multiplied by
resistance.
4. What does a GFCI protect against?
A. Overload
B. Short circuit
C. Ground fault shock
D. Voltage drop
Answer: C. Ground fault shock
Rationale: GFCIs detect imbalance in current and shut off power to
prevent shock.
5. The unit of electrical power is:
A. Volt
B. Amp
C. Watt
D. Ohm
Answer: C. Watt
Rationale: Watts measure electrical power consumption or production.
,6. A series circuit has:
A. Multiple paths
B. One path for current
C. No resistance
D. Infinite current
Answer: B. One path for current
Rationale: Current flows through a single continuous path in series
circuits.
7. Which device protects against overcurrent?
A. Transformer
B. Fuse
C. Relay
D. Capacitor
Answer: B. Fuse
Rationale: Fuses melt under excessive current to break the circuit.
8. Voltage is measured in:
A. Amperes
B. Ohms
C. Watts
D. Volts
Answer: D. Volts
Rationale: Voltage represents electrical potential difference.
, 9. Resistance is measured in:
A. Watts
B. Ohms
C. Volts
D. Joules
Answer: B. Ohms
Rationale: Ohms measure opposition to current flow.
10. The purpose of a transformer is to:
A. Store energy
B. Convert AC to DC
C. Change voltage levels
D. Increase resistance
Answer: C. Change voltage levels
Rationale: Transformers step voltage up or down using electromagnetic
induction.
11. What type of current does a battery produce?
A. AC
B. DC
C. Pulsating AC
D. Reactive current
Answer: B. DC
Rationale: Batteries supply direct current flowing in one direction.
QUESTIONS) With Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of grounding in an electrical system?
A. Increase voltage
B. Reduce resistance
C. Provide a fault current path
D. Store electrical energy
Answer: C. Provide a fault current path
Rationale: Grounding ensures a safe path for fault current to travel,
reducing shock and fire hazards.
2. Which code governs electrical installations in the United States?
A. OSHA
B. NEC
C. ANSI
D. NFPA 70E
Answer: B. NEC
Rationale: The National Electrical Code (NEC) sets the standard for safe
electrical design and installation.
,3. Ohm’s Law is expressed as:
A. V = IR
B. P = IV²
C. I = VR
D. R = VI
Answer: A. V = IR
Rationale: Ohm’s Law defines voltage as current multiplied by
resistance.
4. What does a GFCI protect against?
A. Overload
B. Short circuit
C. Ground fault shock
D. Voltage drop
Answer: C. Ground fault shock
Rationale: GFCIs detect imbalance in current and shut off power to
prevent shock.
5. The unit of electrical power is:
A. Volt
B. Amp
C. Watt
D. Ohm
Answer: C. Watt
Rationale: Watts measure electrical power consumption or production.
,6. A series circuit has:
A. Multiple paths
B. One path for current
C. No resistance
D. Infinite current
Answer: B. One path for current
Rationale: Current flows through a single continuous path in series
circuits.
7. Which device protects against overcurrent?
A. Transformer
B. Fuse
C. Relay
D. Capacitor
Answer: B. Fuse
Rationale: Fuses melt under excessive current to break the circuit.
8. Voltage is measured in:
A. Amperes
B. Ohms
C. Watts
D. Volts
Answer: D. Volts
Rationale: Voltage represents electrical potential difference.
, 9. Resistance is measured in:
A. Watts
B. Ohms
C. Volts
D. Joules
Answer: B. Ohms
Rationale: Ohms measure opposition to current flow.
10. The purpose of a transformer is to:
A. Store energy
B. Convert AC to DC
C. Change voltage levels
D. Increase resistance
Answer: C. Change voltage levels
Rationale: Transformers step voltage up or down using electromagnetic
induction.
11. What type of current does a battery produce?
A. AC
B. DC
C. Pulsating AC
D. Reactive current
Answer: B. DC
Rationale: Batteries supply direct current flowing in one direction.
