An electric light is the most common form of artificial lighting in modern society, it providing the lighting for the buildings and nightime acitive. Before electric lighting became common in the early 20th century ,people were using the candles, gas lights, oil lamps, and fires for lighting. Before the electric light appear there have many problems, such as dim gas lights often killed people when a lamp blew out, and there were many criminals lurked at alleys to rob people. But these problems had solved after the electric light appears.
Most people believe that the light bulb is invented by the Americans Thomas Edison. But actual another American, Henry Goebbels, had invented the same principles and materials, and reliable bulbs, than Edison had for decades, and many others had contributed to the invention of electric lamps before Edison. However, according to a published in 2007 research results, this legend is not enough. Because the electric light people could continue working in larger areas, more work could be done, more goods produced. Also cities were able to stay open all