Welcome — let’s learn electronics with a simple LED circuit: a battery, a resistor, and an LED.

The core idea is: electricity only flows in a complete loop, voltage “pushes” current, and resistance limits how much current flows. For our first example, we’ll use a resistor to protect the LED from too much current.

We haven’t changed your project yet. Next, we can walk through this step by step starting with: what voltage, current, and resistance mean in the LED circuit.