LED

An LED is a light-emitting diode. It shines when current flows through it in the forward direction. On a typical through-hole LED with untrimmed legs, the longer leg is the anode (+) and the shorter one is the cathode (−).

The flat edge on the rim of a usual round LED body marks the cathode (−). If the legs have been shortened or the package is different, check the manufacturer’s pinout. Keep the current within its safe limit, usually with a resistor.

LED stands for Light Emitting Diode, a diode that emits light. Since the D already means Diode, saying “LED diode” repeats the same word — “LED” is enough.

Tiny LEDs sparkle along the festival path, each with a resistor to keep its current safe.