Introduction

Electricity is part of everyday life — from lighting our homes to charging our phones. But how does electric current actually move through circuits? And how can we calculate what happens inside a wire?

This website explains the basic principles of electric circuits and the relationship between voltage, current, and resistance using Ohm's Law.

What you will learn

• what electric current is
• how simple circuits work
• how Ohm's Law connects voltage, current, and resistance
• how to understand circuit behavior visually

Why this topic matters

Understanding Ohm's Law helps us design electrical devices, prevent overloads, and understand how energy flows through circuits.