HOW ELECTIC BULBS ARE MADE

CFL BULBS

• How Arc Lamps Work
  A carbon arc lamp works by hooking two carbon rods to a source of electricity. With the other ends of the rods spaced at the right distance, electrical current will flow through an "arc" of vaporizing carbon creating an intense white light.

All arc lamps use current running through different kinds of gas plasma. A.E. Becquerel of France theorized about the fluorescent lamp in 1857. Low pressure arc lights use a big tube of low pressure gas plasma and include: fluorescent lights and neon signs.

First Electric Incandescent Lamps

Sir Joseph Swann of England and Thomas Edison both invented the first electric incandescent lamps during the 1870s.

•  How Incandescent Lamps Work
  Incandescent lightbulbs work in this way: electricity flows through the filament that is inside the bulb; the filament has resistance to the electricity; the resistance makes the filament heat to a high temperature; the heated filament then radiates light. All incandescent lamps work by using a physical filament.

Thomas A. Edison's lamp became the first commercially successful incandescent lamp (circa 1879). Edison received U.S. Patent 223,898 for his incandescent lamp in 1880. Incandescent lamps are still in regularly use in our homes, today.

• Lightbulbs

Contrary to popular belief, Thomas Alva Edison did not "invent" the first lightbulb, but rather he improved upon a 50-year-old idea. For example: two inventors that patented an incandescent lightbulb before Thomas Edison did were Henry Woodward and Matthew Evan. According to the National Research Council of Canada:

"Henry Woodward of Toronto, who along with Matthew Evans patented a light bulb in 1875. Unfortunately, the two entrepreneurs could not raise the financing to commercialize their invention. The enterprising American Thomas Edison, who had been working on the same idea, bought the rights to their patent. Capital was not a problem for Edison: he had the backing of a syndicate of industrial interests with $50,000 to invest - a sizable sum at the time. Using lower current, a small carbonized filament, and an improved vacuum inside the globe, Edison successfully demonstrated the light bulb in 1879 and, as they say, the rest is history."