1. No suitable material for filament can be found.
2. There is no guarantee for scientific research funds.
In order to invent the electric light, Edison established the world's first technical laboratory, and established the technological creation and invention on the basis of science. In the technical laboratory, he made filaments from carbon strips, nails, grids and platinum. He tried 1600 kinds of materials before and after, and all failed.
For this reason, many experts think that the electric lamp Edison wants to study has a bleak future. Some people also ridiculed Edison's research as "meaningless" and "doing a stupid thing".
Extended data:
Edison invented the light bulb;
1 and 1878 In September, Edison began to study electric lamps, but because of Edison's economic problems, he had to seek financial support, so he set up a joint-stock company to provide financial support for the experiment. Soon, Lorelei found several shareholders who were willing to pay for Edison's electric light research.
However, Edison failed many times and soon spent 50 thousand dollars. The beliefs of some shareholders began to waver. Edison tried hard to persuade the shareholders to give Edison another $50,000.
2.1879 65438+1October 2 1 The electric lamp was successfully developed. He tried nearly 1600 materials for this purpose, and the filament of this electric lamp took 45 hours to burn out. This is the first electric lamp with wide practical value. There are "high resistance incandescent lamp" and "carbonized cotton" in this kind of electric lamp?
3. During the period of1880, Edison sent assistants and experts all over the world to find suitable bamboo. There are about 6,000 kinds, among which Japanese bamboo carbon fiber is the most practical, which can last for more than 1000 hours and achieve the purpose of durability. This kind of lamp is called "carbonized bamboo filament lamp".
4. 188 1 year, Edison exhibited a 27-ton power generation device, which could be illuminated by 1200 electric lamps.
5. 1883, Edison observed that a copper wire was sealed in the light bulb during an electric lamp test, and thought that this could prevent the carbon wire from evaporating and prolong the life of the light bulb. After repeated experiments, although the carbon filaments evaporated as before,
However, from this failure, he found that a weak current passed through the copper wire after the carbon wire was heated. Later, this phenomenon was called "Edison effect". 1904, the British physicist Fleming invented the electron tube according to the Edison effect.
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