Module 4: AC Circuits

Welcome to Module 4, our guide to AC circuits. ‘AC’ stands for Alternating Current, meaning that the current changes with time (typically 50 or 60 times per second). AC shares many properties with DC, and it’s important to have a good understanding of DC before continuing on to AC. On the other hand, much of AC is focused on topics that aren’t necessary for the average electronics tinkerer to understand. However, it’s useful to have some idea of what AC means and to understand the functionality of some AC devices like transformers.

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 important’ 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!

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