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

Using Ohm's Law, R = V ÷ I = 480 ÷ 16 = 30 ohms. Dividing the voltage by the current gives the resistance of the load.

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

In a series circuit, total resistance is the sum of all resistors: 10 + 15 + 25 = 50 ohms. Applying Ohm's Law: I = V ÷ R = 150 ÷ 50 = 3.0 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

Power is calculated using P = V × I = 240 × 12 = 2,880 watts. This formula relates voltage, current, and power in a purely resistive or rated-load scenario.

Question 4

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

Accepted Answer

Voltage across each branch equals the source voltage

Answer

In a parallel circuit, all branches are connected directly across the same two nodes, so every branch sees the full source voltage regardless of its resistance.

Question 5

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

Accepted Answer

20 µF

Answer

For capacitors in series, 1/C_total = 1/C1 + 1/C2 = 1/40 + 1/40 = 2/40, so C_total = 20 µF. Series capacitance behaves opposite to series resistance — it decreases.

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Licensed Electrical Contractor Electrical Contractor Electrical Theory & Fundamentals 1