Maryland Master Electrician Exam
Practice Questions with Correct Answers and
Rationale LATEST UPDATE (2026-2027) FOR
GUARANTEED PASS GET IT RIGHT!
.
Section 1: Electrical Theory and Calculations
1. What is the current in a circuit with 240 volts applied
across a 15-ohm resistance?
A. 16 A
B. 12 A
C. 20 A
D. 3.6 A
Answer: A. 16 A
Rationale: Ohm's Law: I = E / R = = 16 amperes.
2. A 1,800-watt heater operates on a 120-volt single-phase
circuit. How much current does it draw?
A. 12 A
B. 18 A
C. 21.6 A
D. 15 A
Answer: D. 15 A
Rationale: I = P / E = 1, = 15 amperes.
,3. Two resistors of 6 ohms and 3 ohms are connected in
parallel. What is the total resistance?
A. 9 ohms
B. 4.5 ohms
C. 2 ohms
D. 18 ohms
Answer: C. 2 ohms
Rationale: Product over sum: (6 x 3) / (6 + 3) = = 2 ohms.
Parallel resistance is always less than the smallest branch.
4. Three loads of 15, 25, and 40 ohms are connected in
series. What is the total resistance?
A. 40 ohms
B. 80 ohms
C. 25 ohms
D. 8 ohms
Answer: B. 80 ohms
Rationale: In a series circuit, resistances add: 15 + 25 + 40 = 80
ohms.
5. What is the apparent power of a 208-volt, three-phase load
drawing 36 amperes?
A. 13.0 kVA
B. 7.5 kVA
C. 8.6 kVA
D. 22.5 kVA
Answer: A. 13.0 kVA
Rationale: kVA = 1.732 x E x I / 1,000 = 1.732 x 208 x ,000
= approximately 13.0 kVA. The 7.5 kVA choice is the single-
phase result (no 1.732 multiplier).
,6. How much current does a 7,200-watt resistive load draw on
a 240-volt single-phase supply?
A. 17.3 A
B. 60 A
C. 7.2 A
D. 30 A
Answer: D. 30 A
Rationale: I = P / E = 7, = 30 amperes.
7. Using K = 12.9 for copper, what is the approximate voltage
drop of a 20-ampere load on 100 feet (one-way) of 12 AWG
copper (6,530 circular mils) in a single-phase circuit?
A. 3.9 volts
B. 15.8 volts
C. 7.9 volts
D. 2.0 volts
Answer: C. 7.9 volts
Rationale: VD = (2 x K x I x L) / CM = (2 x 12.9 x 20 x 100) /
6,530 = 7.9 V. The 3.9 V choice results from forgetting the factor
of 2 for the round-trip length.
8. A load consumes 5 kW and draws 6.25 kVA. What is its
power factor?
A. 1.25
B. 0.8
C. 0.64
D. 0.5
Answer: B. 0.8
Rationale: Power factor = true power / apparent power = .25
= 0.8.
, 9. In a 208Y/120-volt three-phase system, what is the line-to-
neutral voltage?
A. 120 volts
B. 277 volts
C. 208 volts
D. 240 volts
Answer: A. 120 volts
Rationale: Line-to-neutral = line-to-line / 1.732 = .732 =
120 volts.
10. On a 240/120-volt, three-phase, four-wire delta system,
the phase conductor with the higher voltage to ground (the
'high leg') must be identified by which color?
A. Red
B. Blue
C. Black
D. Orange
Answer: D. Orange
Rationale: NEC 110.15 and 230.56 require the high-leg
conductor (about 208 V to neutral) to be durably marked orange
or otherwise clearly identified.
11. In a series circuit, which quantity is the same through
every component?
A. Voltage
B. Resistance
C. Current
D. Power
Answer: C. Current
Rationale: A series circuit provides a single path, so the same
current flows through every component. Voltage divides across
the loads.
Practice Questions with Correct Answers and
Rationale LATEST UPDATE (2026-2027) FOR
GUARANTEED PASS GET IT RIGHT!
.
Section 1: Electrical Theory and Calculations
1. What is the current in a circuit with 240 volts applied
across a 15-ohm resistance?
A. 16 A
B. 12 A
C. 20 A
D. 3.6 A
Answer: A. 16 A
Rationale: Ohm's Law: I = E / R = = 16 amperes.
2. A 1,800-watt heater operates on a 120-volt single-phase
circuit. How much current does it draw?
A. 12 A
B. 18 A
C. 21.6 A
D. 15 A
Answer: D. 15 A
Rationale: I = P / E = 1, = 15 amperes.
,3. Two resistors of 6 ohms and 3 ohms are connected in
parallel. What is the total resistance?
A. 9 ohms
B. 4.5 ohms
C. 2 ohms
D. 18 ohms
Answer: C. 2 ohms
Rationale: Product over sum: (6 x 3) / (6 + 3) = = 2 ohms.
Parallel resistance is always less than the smallest branch.
4. Three loads of 15, 25, and 40 ohms are connected in
series. What is the total resistance?
A. 40 ohms
B. 80 ohms
C. 25 ohms
D. 8 ohms
Answer: B. 80 ohms
Rationale: In a series circuit, resistances add: 15 + 25 + 40 = 80
ohms.
5. What is the apparent power of a 208-volt, three-phase load
drawing 36 amperes?
A. 13.0 kVA
B. 7.5 kVA
C. 8.6 kVA
D. 22.5 kVA
Answer: A. 13.0 kVA
Rationale: kVA = 1.732 x E x I / 1,000 = 1.732 x 208 x ,000
= approximately 13.0 kVA. The 7.5 kVA choice is the single-
phase result (no 1.732 multiplier).
,6. How much current does a 7,200-watt resistive load draw on
a 240-volt single-phase supply?
A. 17.3 A
B. 60 A
C. 7.2 A
D. 30 A
Answer: D. 30 A
Rationale: I = P / E = 7, = 30 amperes.
7. Using K = 12.9 for copper, what is the approximate voltage
drop of a 20-ampere load on 100 feet (one-way) of 12 AWG
copper (6,530 circular mils) in a single-phase circuit?
A. 3.9 volts
B. 15.8 volts
C. 7.9 volts
D. 2.0 volts
Answer: C. 7.9 volts
Rationale: VD = (2 x K x I x L) / CM = (2 x 12.9 x 20 x 100) /
6,530 = 7.9 V. The 3.9 V choice results from forgetting the factor
of 2 for the round-trip length.
8. A load consumes 5 kW and draws 6.25 kVA. What is its
power factor?
A. 1.25
B. 0.8
C. 0.64
D. 0.5
Answer: B. 0.8
Rationale: Power factor = true power / apparent power = .25
= 0.8.
, 9. In a 208Y/120-volt three-phase system, what is the line-to-
neutral voltage?
A. 120 volts
B. 277 volts
C. 208 volts
D. 240 volts
Answer: A. 120 volts
Rationale: Line-to-neutral = line-to-line / 1.732 = .732 =
120 volts.
10. On a 240/120-volt, three-phase, four-wire delta system,
the phase conductor with the higher voltage to ground (the
'high leg') must be identified by which color?
A. Red
B. Blue
C. Black
D. Orange
Answer: D. Orange
Rationale: NEC 110.15 and 230.56 require the high-leg
conductor (about 208 V to neutral) to be durably marked orange
or otherwise clearly identified.
11. In a series circuit, which quantity is the same through
every component?
A. Voltage
B. Resistance
C. Current
D. Power
Answer: C. Current
Rationale: A series circuit provides a single path, so the same
current flows through every component. Voltage divides across
the loads.
