# Module 2: Fundamental Concepts

## Welcome to Module 2!

**Module 2 – Fundamental Concepts**:

*Lesson 0*: Module 2 Introduction

*Lesson 1*: Electric Circuits

*Lesson 2*: Electric Power Sources

*Lesson 3*: Electric Current

*Lesson 4*: Voltage

*Lesson 5*: Electrical Resistance

*Lesson 6*: Ohm’s Law

*Lesson 7*: Electric Power

## Fundamental Concepts

Welcome to Module 2, an introduction to fundamental concepts in electrical theory. We will build on the topics introduced in Module 1 to introduce you, step by step, to important ideas like voltage, current, resistance, power, and Ohm’s Law.

Electric circuits are the basic building blocks of all electric and electronic systems. Without circuits, we would not be able to generate, transmit, or use electrical power. From the biggest power plants to transistors much smaller than a human hair, circuits are the way in which everything ‘electrical’ works. This Module will introduce you to some of the most important concepts that are critical to every single circuit on the planet.

In Module 2, we’ll learn about important topics like **voltage**, **current**, **resistance**, and **power**. These concepts define how electricity is measured, and how circuits are analyzed. We’ll learn what they are and how they relate to each other. We’ll start looking at the math behind electronics. It may be daunting, but analyzing circuits mathematically is the best (perhaps only?) way to learn about electronics.

We’ll even gain a solid understanding of **Ohm’s Law**, one of the most important equations in electronics. Ohm’s Law is an equation that you will see over and over while working with electronics. It’s impossible to overstate how important it truly is. It helps you develop the intuition to start really understanding circuits, so you can go from an electronics ‘operator’ to a fully fledged ‘maker’.

The material presented in Module 2 provides the backbone for any serious understanding of electrical theory or electronics. You will find it every course in electronics unless they assume you already know this stuff and are starting at a more advanced or applied level. Even if you only read through Module 2, you’ll never look at electricity the same way again. If you decide to progress beyond Module 2, you will already have the necessary fundamentals to provide a strong foundation for your journey.

Let’s get started with Lesson 1, an introduction to electric circuits.

**Module 2 – Fundamental Concepts**:

*Lesson 0*: Module 2 Introduction

*Lesson 1*: Electric Circuits

*Lesson 2*: Electric Power Sources

*Lesson 3*: Electric Current

*Lesson 4*: Voltage

*Lesson 5*: Electrical Resistance

*Lesson 6*: Ohm’s Law

*Lesson 7*: Electric Power

### About This Course

On each page, you will find a drop-down lesson menu at the top of the page and a content listing at the bottom of each page for easy access if you’d like to review past lessons or jump around.

Below the drop-down menu, you will find a ‘*Why it’s important*‘ section to help clarify why we are covering that topic, and why we put it in that order.

Following the ‘*Why it’s importan*t’ section, you will find the main lesson, a link to the next lesson, and a Module content listing below that.

If you’re a newbie, we recommend reading through each lesson before moving on to the next. As in any complex subject, the more you learn, the more you will understand- don’t be surprised if you find it difficult at first- because the farther you go, the more you will be able to understand. Each new concept builds on the last, but also enhances your understanding of what you thought you *already *knew.

As always, if you have any questions, don’t hesitate to reach out!