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

48 Amperes

Answer

0.33 Amperes

Answer

16 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

They become brighter.

Answer

They remain lit with the same brightness.

Answer

They become dimmer.

Question 3

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

Accepted Answer

The voltage is the same across all components.

Answer

The total resistance is the sum of all individual resistances.

Answer

The current is the same through all components.

Answer

If one component fails, the entire circuit stops working.

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

Voltage, measured in Volts (V)

Answer

Current, measured in Amperes (A)

Answer

Power, measured in Watts (W)

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

30 ohms

Answer

15 ohms

Answer

10 ohms

Question 6

What is the primary difference between Alternating Current (AC) and Direct Current (DC)?

Accepted Answer

DC flows in one direction, while AC periodically changes direction.

Answer

AC is only used in low-voltage applications, while DC is for high-voltage.

Answer

DC is generated by power plants, while AC is supplied by batteries.

Answer

AC has a constant voltage, while DC voltage varies.