Ask questions about projects relating to: aerodynamics or hydrodynamics, astronomy, chemistry, electricity, electronics, physics, or engineering
Moderators: MelissaB, kgudger, Ray Trent, Moderators
Hello. This is Yolandy. This is my first time using this website. Thank you for having it open for me.
Will you please explain how LED lights work?
- Posts: 1
- Joined: Wed Dec 19, 2007 8:56 pm
LED stands for "light-emitting diode." A diode consists of two "special" materials that are "put" together. For a regular (non-light emitting diode), when a voltage is applied with one polarity, current flows. In the other polarity, current does not flow. For an LED, when you apply the right voltage polarity (also called a bias) such that current flows, some of the electrons that flow in the current "move" to a lower "energy state." When an electron moves to a lower energy state in an LED, it emits a photon, or light. The amount of energy level change (also called the bandgap energy) determines the color (frequency) of the light.
I hope this helps.
- Former Expert
- Posts: 1
- Joined: Wed Nov 07, 2007 3:32 am
Return to Grades 9-12: Physical Science
Who is online
Users browsing this forum: No registered users and 9 guests