Q: What are LEDs and how do they work

A: LEDs (Light-Emitting Diodes) are semiconductor devices that emit light when an electric current passes through them. They consist of a chip made of a material called a semiconductor, which is surrounded by a transparent plastic lens. When current flows through the chip, electrons and electron holes combine, releasing energy in the form of photons (light). The color of the light emitted depends on the specific materials used in the LED.