Texas Master General Electrical Theory
Examination Review with Answers and
Rationales | 100% Pass Guaranteed | Graded
A+ 1. Ohm’s
Law states that voltage equals:
A. Current × Resistance
B. Current ÷ Resistance
C. Resistance ÷ Current
D. Power × Resistance
Answer: A
V = I × R.
2. What is the current in a 240-volt circuit with a 24-ohm load?
A. 5 A
B. 10 A
C. 12 A
D. 20 A
I = V ÷ R = 240 ÷ 24 = 10 A.
3. Electrical power is calculated by:
A. V ÷ I
B. I ÷ R
C. V × I
D. R × I²
Basic power formula is P = V × I.
4. A 120-V circuit draws 15 A. What is the wattage?
A. 900 W
,B. 1200 W
C. 1800 W
D. 2400 W
P = 120 × 15 = 1800 W.
5. What is the resistance of a device drawing 8 A at 120 V?
A. 10 Ω
B. 15 Ω
C. 20 Ω
D. 960 Ω
R = V ÷ I = 120 ÷ 8.
NEC General Requirements
6. The NEC is primarily intended for:
A. Efficiency
B. Cost savings
C. Safety
D. Energy management
The NEC’s purpose is practical safeguarding of persons and property.
7. How often is the NEC updated?
A. Every year
B. Every 2 years
C. Every 3 years
D. Every 5 years
NEC revision cycle is three years.
8. Working space in front of electrical equipment must be at least:
A. 24 inches
, B. 30 inches wide
C. 30 inches wide and 36 inches deep
D. 48 inches wide
NEC 110.26.
9. Minimum headroom for working space is:
A. 6 ft
B. 6.5 ft
C. 7 ft
D. 8 ft
Minimum 6 ft 6 in.
10. Electrical equipment must be installed in a:
A. Convenient location
B. Dry location only
C. Neat and workmanlike manner
D. Visible location
NEC 110.12.
Grounding & Bonding
11. The main purpose of equipment grounding is to:
A. Reduce voltage
B. Save energy
C. Provide a fault current path
D. Stabilize frequency
Ensures overcurrent devices trip.
12. Grounding electrode conductor size is based on:
A. Load current
Examination Review with Answers and
Rationales | 100% Pass Guaranteed | Graded
A+ 1. Ohm’s
Law states that voltage equals:
A. Current × Resistance
B. Current ÷ Resistance
C. Resistance ÷ Current
D. Power × Resistance
Answer: A
V = I × R.
2. What is the current in a 240-volt circuit with a 24-ohm load?
A. 5 A
B. 10 A
C. 12 A
D. 20 A
I = V ÷ R = 240 ÷ 24 = 10 A.
3. Electrical power is calculated by:
A. V ÷ I
B. I ÷ R
C. V × I
D. R × I²
Basic power formula is P = V × I.
4. A 120-V circuit draws 15 A. What is the wattage?
A. 900 W
,B. 1200 W
C. 1800 W
D. 2400 W
P = 120 × 15 = 1800 W.
5. What is the resistance of a device drawing 8 A at 120 V?
A. 10 Ω
B. 15 Ω
C. 20 Ω
D. 960 Ω
R = V ÷ I = 120 ÷ 8.
NEC General Requirements
6. The NEC is primarily intended for:
A. Efficiency
B. Cost savings
C. Safety
D. Energy management
The NEC’s purpose is practical safeguarding of persons and property.
7. How often is the NEC updated?
A. Every year
B. Every 2 years
C. Every 3 years
D. Every 5 years
NEC revision cycle is three years.
8. Working space in front of electrical equipment must be at least:
A. 24 inches
, B. 30 inches wide
C. 30 inches wide and 36 inches deep
D. 48 inches wide
NEC 110.26.
9. Minimum headroom for working space is:
A. 6 ft
B. 6.5 ft
C. 7 ft
D. 8 ft
Minimum 6 ft 6 in.
10. Electrical equipment must be installed in a:
A. Convenient location
B. Dry location only
C. Neat and workmanlike manner
D. Visible location
NEC 110.12.
Grounding & Bonding
11. The main purpose of equipment grounding is to:
A. Reduce voltage
B. Save energy
C. Provide a fault current path
D. Stabilize frequency
Ensures overcurrent devices trip.
12. Grounding electrode conductor size is based on:
A. Load current
