Page 1 of 198
TEXAS ELECTRICIAN LICENSE
EXAMINATION
COMPLETE PRACTICE QUESTION BANK
2026–2027 EDITION
# PART I: ELECTRICAL THEORY & FUNDAMENTALS
## Section 1.1: Basic Electrical Theory
### Question 1
**What is the direction of conventional current flow in a DC circuit?**
A) From negative to positive terminal
B) From positive to negative terminal
C) Alternating back and forth
D) From ground to source
**Correct Answer: B**
**Rationale:** Conventional current flow assumes that current flows from the positive terminal
through the circuit to the negative terminal. This convention was established before the discovery
of the electron and remains the standard in electrical engineering and the NEC. Electron flow
(actual movement of electrons) is from negative to positive, but conventional current is used for
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circuit analysis and calculations. Understanding this distinction is fundamental for proper circuit
analysis and code compliance.
**Distractor Analysis:**
- **A:** This describes electron flow, not conventional current. While electrons do flow from
negative to positive, the NEC and electrical industry standard use conventional current.
- **C:** This describes alternating current (AC), not DC.
- **D:** Ground is a reference point, not a source of current flow in a simple circuit.
---
### Question 2
**What is the relationship between voltage, current, and resistance as defined by Ohm's Law?**
A) I = V × R
B) V = I × R
C) R = V × I
D) V = I / R
**Correct Answer: B**
**Rationale:** Ohm's Law states that voltage (V) equals current (I) multiplied by resistance (R):
V = I × R. This fundamental relationship is the cornerstone of electrical theory and is essential
for all electrical calculations including conductor sizing, voltage drop, and load calculations. The
formula can be rearranged to solve for any variable: I = V/R or R = V/I.
**Distractor Analysis:**
- **A:** This incorrectly multiplies voltage and resistance. The correct formula for current is I =
V/R.
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- **C:** This incorrectly states resistance equals voltage times current. The correct formula is R
= V/I.
- **D:** This incorrectly states voltage equals current divided by resistance. The correct formula
is V = I × R.
---
### Question 3
**What is the power formula for a DC circuit?**
A) P = I × R
B) P = V × I
C) P = V / I
D) P = R / I
**Correct Answer: B**
**Rationale:** The power formula P = V × I (watts = volts × amperes) is fundamental to
electrical calculations. This formula is used extensively in load calculations, conductor sizing,
and equipment selection. Power in electrical circuits represents the rate at which electrical energy
is converted to another form of energy (heat, light, mechanical, etc.). This formula applies to
both DC circuits and resistive AC circuits.
**Distractor Analysis:**
- **A:** I × R equals voltage (V), not power. This is a common misconception.
- **C:** V/I equals resistance (R), not power.
- **D:** R/I is not a valid electrical formula.
---
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### Question 4
**Which of the following materials has the highest electrical conductivity?**
A) Aluminum
B) Copper
C) Silver
D) Gold
**Correct Answer: C**
**Rationale:** Silver has the highest electrical conductivity of all metals. However, copper is
the most commonly used conductor in electrical installations due to its excellent conductivity-to-
cost ratio. The NEC typically uses copper as the standard conductor material unless otherwise
specified. The conductivity ranking from highest to lowest is: Silver > Copper > Gold >
Aluminum.
**Distractor Analysis:**
- **A:** Aluminum has good conductivity but is approximately 61% as conductive as copper.
- **B:** Copper is the industry standard but is second to silver in conductivity.
- **D:** Gold has good conductivity but is primarily used for its corrosion resistance, not its
conductivity.
---
### Question 5
**What is the SI unit of electrical resistance?**
A) Ampere
B) Volt
TEXAS ELECTRICIAN LICENSE
EXAMINATION
COMPLETE PRACTICE QUESTION BANK
2026–2027 EDITION
# PART I: ELECTRICAL THEORY & FUNDAMENTALS
## Section 1.1: Basic Electrical Theory
### Question 1
**What is the direction of conventional current flow in a DC circuit?**
A) From negative to positive terminal
B) From positive to negative terminal
C) Alternating back and forth
D) From ground to source
**Correct Answer: B**
**Rationale:** Conventional current flow assumes that current flows from the positive terminal
through the circuit to the negative terminal. This convention was established before the discovery
of the electron and remains the standard in electrical engineering and the NEC. Electron flow
(actual movement of electrons) is from negative to positive, but conventional current is used for
,Page 2 of 198
circuit analysis and calculations. Understanding this distinction is fundamental for proper circuit
analysis and code compliance.
**Distractor Analysis:**
- **A:** This describes electron flow, not conventional current. While electrons do flow from
negative to positive, the NEC and electrical industry standard use conventional current.
- **C:** This describes alternating current (AC), not DC.
- **D:** Ground is a reference point, not a source of current flow in a simple circuit.
---
### Question 2
**What is the relationship between voltage, current, and resistance as defined by Ohm's Law?**
A) I = V × R
B) V = I × R
C) R = V × I
D) V = I / R
**Correct Answer: B**
**Rationale:** Ohm's Law states that voltage (V) equals current (I) multiplied by resistance (R):
V = I × R. This fundamental relationship is the cornerstone of electrical theory and is essential
for all electrical calculations including conductor sizing, voltage drop, and load calculations. The
formula can be rearranged to solve for any variable: I = V/R or R = V/I.
**Distractor Analysis:**
- **A:** This incorrectly multiplies voltage and resistance. The correct formula for current is I =
V/R.
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- **C:** This incorrectly states resistance equals voltage times current. The correct formula is R
= V/I.
- **D:** This incorrectly states voltage equals current divided by resistance. The correct formula
is V = I × R.
---
### Question 3
**What is the power formula for a DC circuit?**
A) P = I × R
B) P = V × I
C) P = V / I
D) P = R / I
**Correct Answer: B**
**Rationale:** The power formula P = V × I (watts = volts × amperes) is fundamental to
electrical calculations. This formula is used extensively in load calculations, conductor sizing,
and equipment selection. Power in electrical circuits represents the rate at which electrical energy
is converted to another form of energy (heat, light, mechanical, etc.). This formula applies to
both DC circuits and resistive AC circuits.
**Distractor Analysis:**
- **A:** I × R equals voltage (V), not power. This is a common misconception.
- **C:** V/I equals resistance (R), not power.
- **D:** R/I is not a valid electrical formula.
---
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### Question 4
**Which of the following materials has the highest electrical conductivity?**
A) Aluminum
B) Copper
C) Silver
D) Gold
**Correct Answer: C**
**Rationale:** Silver has the highest electrical conductivity of all metals. However, copper is
the most commonly used conductor in electrical installations due to its excellent conductivity-to-
cost ratio. The NEC typically uses copper as the standard conductor material unless otherwise
specified. The conductivity ranking from highest to lowest is: Silver > Copper > Gold >
Aluminum.
**Distractor Analysis:**
- **A:** Aluminum has good conductivity but is approximately 61% as conductive as copper.
- **B:** Copper is the industry standard but is second to silver in conductivity.
- **D:** Gold has good conductivity but is primarily used for its corrosion resistance, not its
conductivity.
---
### Question 5
**What is the SI unit of electrical resistance?**
A) Ampere
B) Volt
