Engineering Guides & Tutorials

Practical guides to help you master engineering calculations, from resistor color codes to cable sizing.

How to Read SMD Resistor Codes: 3-Digit, 4-Digit & EIA-96 Guide

Decode any surface-mount resistor marking — from simple 3-digit codes to the EIA-96 precision system with reference tables and worked examples.

Understand the preferred number system behind standard resistor values — why 4.7 kΩ exists but 4.5 kΩ doesn't, and how to pick the right series.

Learn how to size cables correctly using voltage drop calculations, current-carrying capacity tables, and NEC guidelines.

Decode 4-band and 5-band resistor color codes like a pro. Includes memorization tricks and common mistakes.

Master voltage divider circuits from basic theory to real-world design. Learn when to use them and how to account for load effects.

A practical guide to Ohm's Law and power calculations with worked examples and common pitfalls.

Understand why voltage drops in electrical circuits and how to calculate and minimize it.

Understand series and parallel resistor formulas, when to use each, and how to combine them for custom values.

Practical guide to sizing cables for LED display installations, including daisy-chain limits and troubleshooting.

Comprehensive AWG to mm² conversion table with resistance values and current ratings.