LEDs- Traffic Lights

We have been talking in the technology class about LEDs. We thougt it was an interesting device used in very common machines or instruments, such as telephones, televisions or traffic lights.

We will fists give you a basic description of what are LEDs and then we will give you an example of its use in traffic lights.

LED technology is simple. An electric current passes through a LED, electrons in that current transform some of their energy into visible light. LEDs use a small fraction of the power that incandescent bulbs require and are even more efficient than fluorescent lights. LEDs produce light cheaply, efficiently, and for extended periods of time.

LEDs are used in traffic lights because they save energy and reduce the emissions of carbon dioxide. We have found a video which describes very well the function of LEDs in traffic lights