CEA - Certified Electrical Apprentice Basic Electrical Theory Questions and Answers

Question 1

According to Ohm's Law, what happens to the current in a circuit if the voltage is doubled while the resistance remains constant?

Accepted Answer

It is doubled.

Answer

Ohm's Law states that current (I) is directly proportional to voltage (V) and inversely proportional to resistance (R), expressed as I = V/R. Therefore, if the voltage is doubled and resistance stays the same, the current must also double to maintain the relationship.

Question 2

An apprentice is tasked with wiring a circuit containing three resistors. If the goal is to have the same voltage across each resistor, which type of circuit configuration should be used?

Accepted Answer

A parallel circuit

Answer

In a parallel circuit, all components are connected across the same two points, meaning the voltage across each branch is the same as the source voltage. In a series circuit, the current is the same through all components, but the voltage is divided among them.

Question 3

Which of the following materials is considered a good electrical insulator?

Accepted Answer

Rubber

Answer

Insulators are materials that have high electrical resistivity and do not allow electrons to move freely. Rubber, plastic, and glass are common examples used to prevent the flow of current. Copper, aluminum, and silver are excellent conductors because their electrons are loosely bound.

Question 4

A 120-volt circuit powers a heater with a resistance of 12 ohms. How much power does the heater consume?

Accepted Answer

1200 watts

Answer

The formula for electrical power (P) is P = V^2 / R, where V is voltage and R is resistance. In this scenario, P = (120V)^2 / 12Ω. So, P = 14400 / 12, which equals 1200 watts.

Question 5

In a simple series circuit, what is the total resistance if it contains three resistors with values of 10Ω, 20Ω, and 30Ω?

Accepted Answer

60Ω

Answer

For resistors connected in series, the total resistance is the sum of the individual resistances. Therefore, R_total = R1 + R2 + R3 = 10Ω + 20Ω + 30Ω = 60Ω.

(CEA) Certified Electrical Apprentice Practice Test

(CEA) Certified Electrical Apprentice Practice Test

CEA - Certified Electrical Apprentice Basic Electrical Theory Questions and Answers