爱迪生发明电灯的故事英文版
亚字组词
爱迪生发明电灯的故事英文版
Before the advent of the electric light, the general u of the lighting tool is the kerone lamp or gas lamp. This lamp burns kerone or gas, therefore, there is a strong black smoke and pungent odor, and to often add fuel, scrub shade, and therefore very inconvenient. More riously, the light is very easy to cau a fire disaster. For many years, many scientists have tried their best to invent a safe and convenient electric lamp.
At the beginning of nineteenth Century, a British chemical houhold 2000 batteries and two carbon rods, made the world's first arc lamp. But this kind of light is too strong, can only be installed on the street or square, ordinary families can not u. Many scientists have brains, houhold electric lamp wants to create a cheap, durable.
This day has finally arrived. In October 21, 1879, an American inventor, through long repeated experiments, finally lit the world's first electric lamp with practical value. Since the
n, the name of the inventor, as he invented the electric light, into the millions of houholds. He was praid as the "king of the invention" Edison.名亭公园
中华经典故事February 11, 1847, Edison was born in Milan, Ohio, the United states. He lives only in school read books for three months, but he was studious, diligent in thinking, the invention of electric light, phonograph, movie cameras and other 1000 kinds of results, made a significant contribution to human beings.
When Edison was 12 years old, he indulged in science experiments, through their own diligently to learn and experiment, at the age of 16, he invented the automatic telegraph to nd a signal every hour. Later, after another invention of the automatic ticket machine, the first practical typewriter, double and four automatic telegraph, telephone and phonograph etc.. With the results of the inventions Edison is not satisfied, in September 1878, Edison decided to electric lighting this fortress launched an attack. He has read a lot of books on electricity lighting, determined to make the price cheap, durable, and safe and convenient electric light.
描写品质的词语
He began to experiment with a white hot light. A small piece of heat resistance in the glass bulb, when the current to burn it to the extent of the heat, it is hot and luminous. He first thought of charcoal, and then put a small cut into a glass bulb, just a power can be broken immediately.
"What is the reason?" Edison picked up the broken into two carbon wire gments, and then look at the glass bulb, after a long time, suddenly thought, "Oh, maybe becau there are air, oxygen in the air and help carbon wire burning, causing it to immediately cut off!" so he ud his hand made an air bubble in the glass removed as much as possible. A power, really did not immediately put out. But 8 minutes later, the lights went out.创业想法
But no matter how to say, Edison finally found: when the vacuum state is very important, the key is carbon filament, the crux of the problem here.
So what kind of heat resistant material should be chon?
周记作文500字Edison thought, the highest melting point, strong heat resistance to platinum! So, Edison 感恩父母的手抄报
and his aides, with platinum tried veral times, but the high melting point of platinum, although the light emitting time extended a lot, but from time to time to turn off the automatic automatic light, is still not ideal.
Edison was not discouraged and went on with his experiments. He has tried the barium, titanium and indium and other rare metals, the effect is not very ideal.
After a period of time, the experimental work on the front of Edison made a summary, all kinds of heat-resistant materials own can think of writing, a total of more than 1600 kinds.
Next, he and aides will be arranged the 1600 kinds of heat resistant materials to test, can try to try, or the u of platinum is the most appropriate. Becau of the improved pumping method, the vacuum degree of the glass bulb is higher, the life of the lamp is prolonged to 2 hours. But this is made of platinum materials made of light, the price is too expensive, who is willing to spend a lot of money to buy only 2 hours of light?
The experimental work was in the doldrums, Edison very distresd, in a cold winter, Edis
on sit by the fire, looking at the burning charcoal, the mouth can not help but automatic speaking: ""
Do the available charcoal charcoal has tried to do? Edison felt hot, shoving the neck scarf off, e this scarf with cloth is made of cotton, Edison's mind suddenly had an idea:
Right! The fiber of the cotton yarn is better than that of the wood, can you u this kind of material?
He hastily pulled off a cotton yarn from the scarf, baked in the fire for a long time, the cotton yarn into a char. He carefully put the wire into a glass bulb, a test, the effect is very good.
动漫人物的眼睛Edison very happy, and then made a lot of cotton yarn made of carbon fiber, conducted a number of concutive tests. The life of a bulb extended for 13 hours, then 45 hours.
