A voltage divider uses two or more resistive elements to output a lower voltage than was input. This can have many functions, like allowing communications between devices operating at different voltages, and acting as inputs for devices that have variable resistance. After the break I’ll look at some of those uses, and cover the basic principles of voltage dividers.
One of the first thing’s you’re going to want to do when getting into hobby electronics is to light up some LEDs. Take the time to read through this guide and you’ll have a basic understanding of how they work and how to use them.