So, what is this site about you ask?
This is for people that want to buy an Arduino, Raspberry PI, Photon, RedBear Duo or any of the other prototyping boards, and make them work, but don’t know, or have forgotten what a resistor is, and why you need it with an LED.
This is for the people that think the beginners class is way to advanced, and prefer to use a breadboard for making lunch.
Stick with me, and together we will brave the Ohms, the Vs and even the mystic Is…. i may have duplicated something there, but from the dusty reachs of my mind v = i r
onward, to a working LED :