Why Does Voltage Drop Happen in Long Wires? (And How to Fix It)
Have you ever noticed a power tool struggling to start at the end of a long extension cord, or perhaps your outdoor lights seem a bit dimmer than the ones inside? This isn't your imagination—it’s a physical phenomenon known as voltage drop. Understanding why this happens is key to keeping your electrical systems running safely and efficiently. Let’s break down the science behind the "pressure loss" in your wires. The Science: It’s All About Resistance At its core, voltage drop is caused by the natural resistance of the wire. While we think of copper or aluminum as perfect conductors, they aren't. As electricity flows through a wire, the electrons bump into atoms, creating friction. This friction converts some of that electrical energy into heat , causing the electrical "pressure" (voltage) to decrease by the time it reaches its destination. This relationship is governed by Ohm’s Law , which tells us that three main factors dictate how much voltage you’ll lo...