CEA Electrical Theory & Fundamentals

Question 1

What is Ohm’s Law?

Accepted Answer

Voltage equals current times resistance

Answer

Ohm's Law is a fundamental principle in electrical engineering that describes the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit. It states that the voltage across a conductor is directly proportional to the current flowing through it, given by the formula V = I × R. This law is crucial for understanding and calculating electrical circuit behavior.

Question 2

Which unit is used to measure electrical resistance?

Accepted Answer

Ohm

Answer

The Ohm (Ω) is the standard unit of electrical resistance, named after Georg Simon Ohm. Resistance is a measure of how much an object or material opposes the flow of electric current. Other units like Ampere measure current, Volt measures voltage, and Watt measures power.

Question 3

What does a capacitor do in an electrical circuit?

Accepted Answer

Stores electrical charge

Answer

A capacitor is a passive electronic component designed to store electrical energy in an electric field. It consists of two conductive plates separated by a dielectric material. When a voltage is applied, charge accumulates on the plates, allowing the capacitor to store and then release this energy, often used for filtering or timing in circuits.

Question 4

What is the function of a transformer?

Accepted Answer

Changes voltage levels in AC

Answer

A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction. Its primary function is to change voltage levels in alternating current (AC) circuits, either stepping up (increasing) or stepping down (decreasing) the voltage. This capability is crucial for efficient power transmission and distribution.

Question 5

Which component opposes changes in current flow?

Accepted Answer

Inductor

Answer

An inductor is a passive electrical component that stores energy in a magnetic field when electric current flows through it. Its primary characteristic, inductance, causes it to oppose changes in the current flowing through it. This property is utilized in many circuits for filtering, energy storage, and tuning.

(CEA) Certified Electrical Apprentice Practice Test

(CEA) Certified Electrical Apprentice Practice Test

CEA Electrical Theory & Fundamentals