LEDs

The white and color LEDs (D6 & D8) are light-emitting diodes, and may be thought of as special one-way light bulbs. In the “forward” direction, (indicated by the “arrow” in the symbol), electricity flows if the voltage exceeds a turn-on threshold brightness then increases. The color LED contains red, green, and blue LEDs, with a micro-circuit controlling then. A high current will burn out an LED, so the current must be limited by other components in the circuit (Snap Circuits® LEDs have internal resistors added to protect them in case you make wiring mistakes). LEDs block electricity in the “reverse” direction.