NEVADA C-2 ELECTRICAL CONTRACTOR EXAM
Practice Questions and Correct Answers
1Multiple-Choice Questions with Highlighted Answers and
Rationales Latest update for Guaranteed Success
Section 1: Electrical Theory and Calculations
1. Ohm's law states that voltage equals:
A. Current divided by resistance
B. Resistance divided by current
C. Current plus resistance
D. Current multiplied by resistance (E = I x R)
Answer: D. Current multiplied by resistance (E = I x R)
Rationale: Voltage, current, and resistance are related by E = I x
R.
2. A 12-volt circuit has a 4-ohm resistance. What is the
current?
A. 3 amperes
B. 48 amperes
C. 8 amperes
D. 0.33 ampere
Answer: A. 3 amperes
Rationale: I = E / R = = 3 A.
Nevada C-2 Electrical Contractor Practice Exam - Page 1
,3. A circuit draws 10 amperes at 120 volts. What is its
resistance?
A. 1,200 ohms
B. 0.083 ohm
C. 12 ohms
D. 130 ohms
Answer: C. 12 ohms
Rationale: R = E / I = = 12 ohms.
4. The basic formula for electrical power in watts is:
A. P = E / I
B. P = E x I
C. P = I / R
D. P = E + I
Answer: B. P = E x I
Rationale: Power equals voltage times current.
5. A 1,200-watt load is connected to 120 volts. What is the
current?
A. 12 amperes
B. 100 amperes
C. 144,000 amperes
D. 10 amperes
Answer: D. 10 amperes
Rationale: I = P / E = 1, = 10 A.
Nevada C-2 Electrical Contractor Practice Exam - Page 2
,6. In a series circuit:
A. The current is the same through every component
B. The voltage is the same across every component
C. The current divides among the components
D. The total resistance is the smallest resistor
Answer: A. The current is the same through every
component
Rationale: A series circuit has only one path for current.
7. In a parallel circuit:
A. The current is the same in every branch
B. Total resistance equals the sum of the branches
C. The voltage is the same across every branch
D. Only one branch carries current
Answer: C. The voltage is the same across every branch
Rationale: Each branch connects across the same two points.
8. Three resistors of 10, 20, and 30 ohms are connected in
series. The total resistance is:
A. 30 ohms
B. 60 ohms
C. 18 ohms
D. 600 ohms
Answer: B. 60 ohms
Rationale: Series resistances add: 10 + 20 + 30 = 60.
Nevada C-2 Electrical Contractor Practice Exam - Page 3
, 9. Two 20-ohm resistors are connected in parallel. The total
resistance is:
A. 40 ohms
B. 20 ohms
C. 5 ohms
D. 10 ohms
Answer: D. 10 ohms
Rationale: For equal resistors in parallel, divide one value by the
number of resistors.
10. The unit of electrical power is the:
A. Watt
B. Volt
C. Ohm
D. Ampere
Answer: A. Watt
Rationale: Power is measured in watts (W).
11. The unit of electrical resistance is the:
A. Watt
B. Henry
C. Ohm
D. Farad
Answer: C. Ohm
Rationale: Resistance is measured in ohms.
Nevada C-2 Electrical Contractor Practice Exam - Page 4
Practice Questions and Correct Answers
1Multiple-Choice Questions with Highlighted Answers and
Rationales Latest update for Guaranteed Success
Section 1: Electrical Theory and Calculations
1. Ohm's law states that voltage equals:
A. Current divided by resistance
B. Resistance divided by current
C. Current plus resistance
D. Current multiplied by resistance (E = I x R)
Answer: D. Current multiplied by resistance (E = I x R)
Rationale: Voltage, current, and resistance are related by E = I x
R.
2. A 12-volt circuit has a 4-ohm resistance. What is the
current?
A. 3 amperes
B. 48 amperes
C. 8 amperes
D. 0.33 ampere
Answer: A. 3 amperes
Rationale: I = E / R = = 3 A.
Nevada C-2 Electrical Contractor Practice Exam - Page 1
,3. A circuit draws 10 amperes at 120 volts. What is its
resistance?
A. 1,200 ohms
B. 0.083 ohm
C. 12 ohms
D. 130 ohms
Answer: C. 12 ohms
Rationale: R = E / I = = 12 ohms.
4. The basic formula for electrical power in watts is:
A. P = E / I
B. P = E x I
C. P = I / R
D. P = E + I
Answer: B. P = E x I
Rationale: Power equals voltage times current.
5. A 1,200-watt load is connected to 120 volts. What is the
current?
A. 12 amperes
B. 100 amperes
C. 144,000 amperes
D. 10 amperes
Answer: D. 10 amperes
Rationale: I = P / E = 1, = 10 A.
Nevada C-2 Electrical Contractor Practice Exam - Page 2
,6. In a series circuit:
A. The current is the same through every component
B. The voltage is the same across every component
C. The current divides among the components
D. The total resistance is the smallest resistor
Answer: A. The current is the same through every
component
Rationale: A series circuit has only one path for current.
7. In a parallel circuit:
A. The current is the same in every branch
B. Total resistance equals the sum of the branches
C. The voltage is the same across every branch
D. Only one branch carries current
Answer: C. The voltage is the same across every branch
Rationale: Each branch connects across the same two points.
8. Three resistors of 10, 20, and 30 ohms are connected in
series. The total resistance is:
A. 30 ohms
B. 60 ohms
C. 18 ohms
D. 600 ohms
Answer: B. 60 ohms
Rationale: Series resistances add: 10 + 20 + 30 = 60.
Nevada C-2 Electrical Contractor Practice Exam - Page 3
, 9. Two 20-ohm resistors are connected in parallel. The total
resistance is:
A. 40 ohms
B. 20 ohms
C. 5 ohms
D. 10 ohms
Answer: D. 10 ohms
Rationale: For equal resistors in parallel, divide one value by the
number of resistors.
10. The unit of electrical power is the:
A. Watt
B. Volt
C. Ohm
D. Ampere
Answer: A. Watt
Rationale: Power is measured in watts (W).
11. The unit of electrical resistance is the:
A. Watt
B. Henry
C. Ohm
D. Farad
Answer: C. Ohm
Rationale: Resistance is measured in ohms.
Nevada C-2 Electrical Contractor Practice Exam - Page 4
