CEP Electrical Theory & Principles

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, with the constant of proportionality being the resistance. The formula is commonly expressed as V = I * R.

Question 2

What unit is electric current measured in?

Accepted Answer

Amperes

Answer

Electric current is the rate of flow of electric charge through a conductor. The standard unit of measurement for electric current is the Ampere (A), often shortened to 'amp.' One ampere represents one coulomb of charge passing a point in one second.

Question 3

What does resistance do in an electrical circuit?

Accepted Answer

Limits current flow

Answer

Resistance is a property of a material that opposes the flow of electric current. In an electrical circuit, components with resistance convert electrical energy into other forms, such as heat, and effectively limit the amount of current that can pass through them for a given voltage. Higher resistance leads to lower current flow, assuming voltage remains constant.

Question 4

What is a conductor?

Accepted Answer

Allows electricity flow

Answer

A conductor is a material that readily allows electric current to flow through it. This is because conductors have free electrons that can move easily from atom to atom when an electric field is applied. Common examples include metals like copper and aluminum, which are widely used in wiring and electrical components.

Question 5

What is alternating current (AC)?

Accepted Answer

Current reversing periodically

Answer

Alternating current (AC) is an electric current that periodically reverses direction, unlike direct current (DC) which flows in only one direction. AC is the form of electricity typically delivered to homes and businesses, as it can be efficiently transmitted over long distances and its voltage can be easily transformed using transformers. The frequency of reversal is usually 50 or 60 Hz.

(CEP) Certified Electrical Professional Practice Test

(CEP) Certified Electrical Professional Practice Test

CEP Electrical Theory & Principles