"An LED (light-emitting diode) is a special kind of diode that emits light when a current flows through it. The LED has two terminals, an anode and a cathode. Because it is a diode, electrons can only flow in one direction. When the electrons cross the barrier between the anode and the cathode, they release a photon, which produces light."
"A diode lets electrons flow in only one direction. It works like a switch: when current is flowing one way, the switch is on, but when current tries to flow the other way, the switch turns off. Sir John Ambrose Fleming is best known for inventing the diode, originally called the kenotron."
So much awesome knowledge!
And, here is a way to share this blinky awesomeness.
- LEDs - our rainbow flashing LEDs are the most satisfying
- CR2032 Batteries
220 Ohm or 330 Ohm resistors
- Diagonal Cutters
- Small Flat Pliers or Crimping Pliers
- Shrink Tubing
- Small Ziplock Baggies ( 2 x 3 inches )
If you don't have any of these tools, you might want to consider Ladyada's Electronics Toolkit. It has everything you need... and more.
If you plan on soldering any of the components, I recommend using SAC305 RoHS lead-free Solder... especially if your kits are going to be in tiny hands.