Study Guides

Electrical Theory & NEC Code, Explained

Free in-depth guides covering electrical theory, NEC code articles, HVAC fundamentals, and exam concepts — with fully worked examples.

All Guides Electrical Theory Basics

Electrical Theory Basics

1 guide

The fundamentals every electrician needs before the code makes sense -- Ohm's Law, circuits, and how electricity actually behaves.

Electrical Theory Basics

Ohm's Law and Basic Circuit Theory Explained

A deep, worked-example-driven guide to Ohm's Law, series and parallel circuit math, the power formulas, AC vs DC, and how this one relationship drives voltage drop, load calculations, motor sizing, and multimeter troubleshooting.

Read guide