Apprentice Electrician Licensing Exam
Practice Test 100 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 a branch circuit?
A. To increase voltage
B. To reduce resistance
C. To protect circuits from overcurrent
D. To store electrical energy
A circuit breaker is designed to automatically interrupt current flow when it
exceeds safe levels, preventing overheating and fire.
2. What unit is used to measure electrical current?
A. Volt
B. Ohm
C. Ampere
D. Watt
Electrical current is measured in amperes, representing the rate of electron
flow through a conductor.
3. Which conductor is typically color-coded green or bare?
A. Hot wire
B. Neutral wire
C. Ground wire
D. Traveler wire
,The equipment grounding conductor is identified by green insulation or no
insulation (bare) and provides a safety path for fault current.
4. What does Ohm's Law describe?
A. Power and resistance
B. Voltage, current, and resistance
C. Energy and force
D. Frequency and voltage
Ohm's Law states that voltage equals current multiplied by resistance (V = IR),
describing the fundamental relationship among these three quantities.
5. Which tool is used to measure voltage?
A. Ammeter
B. Ohmmeter
C. Voltmeter
D. Wattmeter
A voltmeter measures electrical potential difference between two points in a
circuit.
6. What is the unit of electrical resistance?
A. Volt
B. Ampere
C. Ohm
D. Watt
Resistance is measured in ohms, representing how much a material opposes
current flow.
7. In a series circuit, total resistance is:
A. Less than the smallest resistor
B. The sum of all individual resistances
C. The average of all resistances
D. The product divided by the sum
In a series circuit, electrons pass through each resistor sequentially, so all
resistances add together.
, 8. What is the formula for electrical power?
A. P = V × I
B. P = V / I
C. P = I / R
D. P = V × R
Power equals voltage multiplied by current. This is the fundamental power
formula used in electrical calculations.
9. How many amperes does a 120-volt, 60-watt incandescent bulb draw?
A. 0.25 amps
B. 0.50 amps
C. 1.0 amps
D. 2.0 amps
Using the power formula P = V × I, rearrange to I = P / V. For a 60-watt bulb at
120 volts: = 0.5 amperes.
10.Alternating current (AC) is defined as:
A. Current that flows in only one direction
B. Current that periodically reverses direction and changes magnitude
C. Current that maintains constant voltage
D. Current that flows only when a switch is closed
AC periodically reverses direction through regular positive and negative
cycles following a sinusoidal waveform.
11.What is the symbol for a resistor in electrical diagrams?
A. Parallel lines
B. Zig-zag line
C. Triangle
D. Circle with R
The zig-zag line universally represents a resistor in electrical schematic
diagrams.
12.What is the standard voltage for residential outlets in most systems?
Practice Test 100 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 a branch circuit?
A. To increase voltage
B. To reduce resistance
C. To protect circuits from overcurrent
D. To store electrical energy
A circuit breaker is designed to automatically interrupt current flow when it
exceeds safe levels, preventing overheating and fire.
2. What unit is used to measure electrical current?
A. Volt
B. Ohm
C. Ampere
D. Watt
Electrical current is measured in amperes, representing the rate of electron
flow through a conductor.
3. Which conductor is typically color-coded green or bare?
A. Hot wire
B. Neutral wire
C. Ground wire
D. Traveler wire
,The equipment grounding conductor is identified by green insulation or no
insulation (bare) and provides a safety path for fault current.
4. What does Ohm's Law describe?
A. Power and resistance
B. Voltage, current, and resistance
C. Energy and force
D. Frequency and voltage
Ohm's Law states that voltage equals current multiplied by resistance (V = IR),
describing the fundamental relationship among these three quantities.
5. Which tool is used to measure voltage?
A. Ammeter
B. Ohmmeter
C. Voltmeter
D. Wattmeter
A voltmeter measures electrical potential difference between two points in a
circuit.
6. What is the unit of electrical resistance?
A. Volt
B. Ampere
C. Ohm
D. Watt
Resistance is measured in ohms, representing how much a material opposes
current flow.
7. In a series circuit, total resistance is:
A. Less than the smallest resistor
B. The sum of all individual resistances
C. The average of all resistances
D. The product divided by the sum
In a series circuit, electrons pass through each resistor sequentially, so all
resistances add together.
, 8. What is the formula for electrical power?
A. P = V × I
B. P = V / I
C. P = I / R
D. P = V × R
Power equals voltage multiplied by current. This is the fundamental power
formula used in electrical calculations.
9. How many amperes does a 120-volt, 60-watt incandescent bulb draw?
A. 0.25 amps
B. 0.50 amps
C. 1.0 amps
D. 2.0 amps
Using the power formula P = V × I, rearrange to I = P / V. For a 60-watt bulb at
120 volts: = 0.5 amperes.
10.Alternating current (AC) is defined as:
A. Current that flows in only one direction
B. Current that periodically reverses direction and changes magnitude
C. Current that maintains constant voltage
D. Current that flows only when a switch is closed
AC periodically reverses direction through regular positive and negative
cycles following a sinusoidal waveform.
11.What is the symbol for a resistor in electrical diagrams?
A. Parallel lines
B. Zig-zag line
C. Triangle
D. Circle with R
The zig-zag line universally represents a resistor in electrical schematic
diagrams.
12.What is the standard voltage for residential outlets in most systems?
