Licensed Electrical Contractor Electrical Contractor Electrical Theory & Fundamentals 1

Question 1

A 480-volt circuit draws 16 amperes of current. What is the resistance of the load?

Accepted Answer

30 ohms

Answer

24 ohms

Answer

496 ohms

Answer

7,680 ohms

Question 2

Three resistors of 10 ohms, 15 ohms, and 25 ohms are connected in series to a 150-volt source. What is the current flowing through the circuit?

Accepted Answer

3.0 amperes

Answer

1.5 amperes

Answer

2.0 amperes

Answer

5.0 amperes

Question 3

An electric motor draws 12 amperes from a 240-volt supply. What is the power consumed by the motor?

Accepted Answer

2,880 watts

Answer

252 watts

Answer

1,440 watts

Answer

28,800 watts

Question 4

What is a defining characteristic of voltage in a parallel circuit?

Accepted Answer

Voltage across each branch equals the source voltage

Answer

Voltage divides equally among all branches

Answer

Voltage is highest across the branch with the most resistance

Answer

Voltage decreases with each additional branch added

Question 5

Two 40-microfarad capacitors are connected in series. What is the total capacitance of the combination?

Accepted Answer

20 µF

Answer

10 µF

Answer

40 µF

Answer

80 µF

Question 6

What is the standard frequency of alternating current (AC) supplied to residential and commercial buildings in the United States?

Accepted Answer

60 Hz

Answer

25 Hz

Answer

50 Hz

Answer

120 Hz