MARYLAND MASTER ELECTRICIAN
CALCULATIONS & CODE APPLICATION
PRACTICE
2026 EDITION
450 Unique Multiple-Choice Questions
Marked Answers • Practical Calculations • Focused Rationales
A calculation-heavy companion practice resource for electrical exam preparation, covering
formulas, load applications, sizing concepts, and code-based scenarios.
Use the NEC edition and Maryland/local-jurisdiction requirements applicable to the exam
date or project.
, TABLE OF CONTENTS
Section Focus
Ohm's Law & Basic Circuit Math Voltage, current, resistance and power relationships
Power, Energy & Power Factor kW, kVA, kWh and power-factor calculations
Load Calculations & Demand Connected loads, demand concepts and sizing applications
Voltage Drop & Conductor Sizing Voltage-drop calculations and conductor selection principles
Three-Phase Calculations Three-phase power, current and voltage relationships
Motor Calculations Motor current, power, efficiency and circuit applications
Transformer & kVA Calculations Transformer ratios, kVA and secondary calculations
Overcurrent & Protection Calculations Protection ratings and electrical calculations
Raceway & Box Fill Calculations Conductor count, fill and raceway applications
Grounding & Bonding Applications Grounding and bonding calculation/application scenarios
Branch Circuit Applications Branch-circuit loads and installation scenarios
Service & Feeder Applications Service and feeder load applications
Lighting & Equipment Calculations Lighting loads and equipment power calculations
Code Application Scenarios Applied electrical-code decision questions
Maryland Master Electrician • Calculations & Code Practice • 2026 Page 2
, Ohm's Law & Basic Circuit Math
1. A 120 V circuit has a resistance of 20 ohms. What current flows?
A. 4 A
B. 6 A
C. 8 A
D. 10 A
Correct Answer: B. 6 A
Rationale: Using I = V/R, 120 ÷ 20 = 6 A.
2. A load draws 8 A at 240 V. What is its power?
A. 1,440 W
B. 1,920 W
C. 2,400 W
D. 3,840 W
Correct Answer: B. 1,920 W
Rationale: Using P = V × I, 240 × 8 = 1,920 W.
3. A 1,500 W heater operates at 120 V. Approximately how much current does it draw?
A. 8.0 A
B. 10.0 A
C. 12.5 A
D. 15.0 A
Correct Answer: C. 12.5 A
Rationale: I = P/V = 1,500 ÷ 120 = 12.5 A.
4. A 24 ohm load carries 5 A. What voltage is applied?
A. 96 V
B. 120 V
C. 144 V
D. 240 V
Correct Answer: B. 120 V
Rationale: V = I × R = 5 × 24 = 120 V.
5. Two 10-ohm resistors are connected in series. What is total resistance?
A. 5 ohms
B. 10 ohms
C. 20 ohms
D. 100 ohms
Correct Answer: C. 20 ohms
Rationale: Series resistances add: 10 + 10 = 20 ohms.
6. Two 10-ohm resistors are connected in parallel. What is total resistance?
A. 2 ohms
B. 5 ohms
C. 10 ohms
D. 20 ohms
Correct Answer: B. 5 ohms
Rationale: Equal resistances in parallel divide by their number: 10 ÷ 2 = 5 ohms.
Maryland Master Electrician • Calculations & Code Practice • 2026 Page 3
, 7. A 120 V load draws 5 A. What is its apparent power for a unity-power-factor load?
A. 240 VA
B. 480 VA
C. 600 VA
D. 1,200 VA
Correct Answer: C. 600 VA
Rationale: At unity power factor, VA = W = V × I = 600.
8. A circuit has 240 V and 12 A. What is the resistance?
A. 10 ohms
B. 20 ohms
C. 24 ohms
D. 28.8 ohms
Correct Answer: B. 20 ohms
Rationale: R = V/I = 240 ÷ 12 = 20 ohms.
9. If voltage doubles while resistance remains constant, current will:
A. Halve
B. Double
C. Remain the same
D. Become zero
Correct Answer: B. Double
Rationale: Ohm's law shows current is directly proportional to voltage when resistance is constant.
10. A 600 W load operates at 120 V. What current does it draw?
A. 2 A
B. 5 A
C. 10 A
D. 20 A
Correct Answer: B. 5 A
Rationale: I = 600 ÷ 120 = 5 A.
11. A 2 kW load operates for 3 hours. How much energy does it use?
A. 2 kWh
B. 5 kWh
C. 6 kWh
D. 9 kWh
Correct Answer: C. 6 kWh
Rationale: Energy = power × time = 2 kW × 3 h = 6 kWh.
12. A 10 kVA load has a 0.8 power factor. What is real power?
A. 6 kW
B. 8 kW
C. 10 kW
D. 12.5 kW
Correct Answer: B. 8 kW
Rationale: kW = kVA × PF = 10 × 0.8 = 8 kW.
Maryland Master Electrician • Calculations & Code Practice • 2026 Page 4
CALCULATIONS & CODE APPLICATION
PRACTICE
2026 EDITION
450 Unique Multiple-Choice Questions
Marked Answers • Practical Calculations • Focused Rationales
A calculation-heavy companion practice resource for electrical exam preparation, covering
formulas, load applications, sizing concepts, and code-based scenarios.
Use the NEC edition and Maryland/local-jurisdiction requirements applicable to the exam
date or project.
, TABLE OF CONTENTS
Section Focus
Ohm's Law & Basic Circuit Math Voltage, current, resistance and power relationships
Power, Energy & Power Factor kW, kVA, kWh and power-factor calculations
Load Calculations & Demand Connected loads, demand concepts and sizing applications
Voltage Drop & Conductor Sizing Voltage-drop calculations and conductor selection principles
Three-Phase Calculations Three-phase power, current and voltage relationships
Motor Calculations Motor current, power, efficiency and circuit applications
Transformer & kVA Calculations Transformer ratios, kVA and secondary calculations
Overcurrent & Protection Calculations Protection ratings and electrical calculations
Raceway & Box Fill Calculations Conductor count, fill and raceway applications
Grounding & Bonding Applications Grounding and bonding calculation/application scenarios
Branch Circuit Applications Branch-circuit loads and installation scenarios
Service & Feeder Applications Service and feeder load applications
Lighting & Equipment Calculations Lighting loads and equipment power calculations
Code Application Scenarios Applied electrical-code decision questions
Maryland Master Electrician • Calculations & Code Practice • 2026 Page 2
, Ohm's Law & Basic Circuit Math
1. A 120 V circuit has a resistance of 20 ohms. What current flows?
A. 4 A
B. 6 A
C. 8 A
D. 10 A
Correct Answer: B. 6 A
Rationale: Using I = V/R, 120 ÷ 20 = 6 A.
2. A load draws 8 A at 240 V. What is its power?
A. 1,440 W
B. 1,920 W
C. 2,400 W
D. 3,840 W
Correct Answer: B. 1,920 W
Rationale: Using P = V × I, 240 × 8 = 1,920 W.
3. A 1,500 W heater operates at 120 V. Approximately how much current does it draw?
A. 8.0 A
B. 10.0 A
C. 12.5 A
D. 15.0 A
Correct Answer: C. 12.5 A
Rationale: I = P/V = 1,500 ÷ 120 = 12.5 A.
4. A 24 ohm load carries 5 A. What voltage is applied?
A. 96 V
B. 120 V
C. 144 V
D. 240 V
Correct Answer: B. 120 V
Rationale: V = I × R = 5 × 24 = 120 V.
5. Two 10-ohm resistors are connected in series. What is total resistance?
A. 5 ohms
B. 10 ohms
C. 20 ohms
D. 100 ohms
Correct Answer: C. 20 ohms
Rationale: Series resistances add: 10 + 10 = 20 ohms.
6. Two 10-ohm resistors are connected in parallel. What is total resistance?
A. 2 ohms
B. 5 ohms
C. 10 ohms
D. 20 ohms
Correct Answer: B. 5 ohms
Rationale: Equal resistances in parallel divide by their number: 10 ÷ 2 = 5 ohms.
Maryland Master Electrician • Calculations & Code Practice • 2026 Page 3
, 7. A 120 V load draws 5 A. What is its apparent power for a unity-power-factor load?
A. 240 VA
B. 480 VA
C. 600 VA
D. 1,200 VA
Correct Answer: C. 600 VA
Rationale: At unity power factor, VA = W = V × I = 600.
8. A circuit has 240 V and 12 A. What is the resistance?
A. 10 ohms
B. 20 ohms
C. 24 ohms
D. 28.8 ohms
Correct Answer: B. 20 ohms
Rationale: R = V/I = 240 ÷ 12 = 20 ohms.
9. If voltage doubles while resistance remains constant, current will:
A. Halve
B. Double
C. Remain the same
D. Become zero
Correct Answer: B. Double
Rationale: Ohm's law shows current is directly proportional to voltage when resistance is constant.
10. A 600 W load operates at 120 V. What current does it draw?
A. 2 A
B. 5 A
C. 10 A
D. 20 A
Correct Answer: B. 5 A
Rationale: I = 600 ÷ 120 = 5 A.
11. A 2 kW load operates for 3 hours. How much energy does it use?
A. 2 kWh
B. 5 kWh
C. 6 kWh
D. 9 kWh
Correct Answer: C. 6 kWh
Rationale: Energy = power × time = 2 kW × 3 h = 6 kWh.
12. A 10 kVA load has a 0.8 power factor. What is real power?
A. 6 kW
B. 8 kW
C. 10 kW
D. 12.5 kW
Correct Answer: B. 8 kW
Rationale: kW = kVA × PF = 10 × 0.8 = 8 kW.
Maryland Master Electrician • Calculations & Code Practice • 2026 Page 4
