Passengers talk about the Pennsylvanian, an Amtrak passenger train that runs between Pittsburgh and Philadelphia. It was announced that the line may cease in October of 2013. (Video by Michael Henninger; 2/17/2013). think it would be worth it for Amtrak and PennDOT to see if more schedule diversity might make it a more popular travel option, Ms. Katchmar says. â¢ Go to post-gazette.com for a slideshow of photos taken aboard the Pennsylvanian and a video report. Jon Schmitz: jschmitz@post-gazette.com or 412-263-1868.
A light-emitting diode (LED) is a semiconductor device that creates light using solid-state electronics. A diode is composed of a layer of electron rich material separated by a layer of electron deficient material which forms a junction.
How Solar Works. We can change sunlight directly to electricity using solar cells. Every day, light hits your roof's solar panels with photons (particles of sunlight). The solar panel converts those photons into electrons of direct current (DC) electricity. The electrons flow out of the solar panel and into an inverter and other electrical safety devices.