CEA Basic Electrical Theory Questions and Answers

Question 1

An electrical apprentice is tasked with calculating the current in a simple DC circuit. The circuit has a voltage of 12 volts and a total resistance of 4 ohms. According to Ohm's Law, what is the current flowing through this circuit?

Accepted Answer

3 Amperes

Answer

Ohm's Law states that Current (I) = Voltage (V) / Resistance (R). In this scenario, I = 12V / 4Ω, which equals 3 Amperes.

Question 2

In a series circuit, if one of three light bulbs burns out, what happens to the other two bulbs?

Accepted Answer

They all go out.

Answer

In a series circuit, there is only one path for the current to flow. If one bulb burns out, the path is broken, and the entire circuit is opened, causing all the bulbs to go out.

Question 3

Which of the following statements is true for a parallel circuit?

Accepted Answer

The voltage is the same across all components.

Answer

A key characteristic of a parallel circuit is that the voltage is constant across all components connected in parallel. The total current is divided among the branches, and the total resistance is less than the smallest individual resistance.

Question 4

An apprentice measures the opposition to current flow in a circuit. What is this property called, and what unit is it measured in?

Accepted Answer

Resistance, measured in Ohms (Ω)

Answer

Resistance is the measure of the opposition to current flow in an electrical circuit. It is measured in units called Ohms (Ω).

Question 5

A senior electrician asks an apprentice to calculate the total resistance of a circuit containing two resistors connected in parallel. The resistors have values of 10 ohms and 20 ohms. What is the approximate total resistance?

Accepted Answer

6.67 ohms

Answer

The formula for calculating the total resistance (Rt) of two resistors in parallel is Rt = (R1 * R2) / (R1 + R2). Therefore, Rt = (10 * 20) / (10 + 20) = 200 / 30 ≈ 6.67 ohms. The total resistance in a parallel circuit is always less than the smallest individual resistor.

(CEA) Certified Electrical Apprentice Practice Test

(CEA) Certified Electrical Apprentice Practice Test

CEA Basic Electrical Theory Questions and Answers