Essay: Telephone and Electric Light 300 words
The invention of electric light
Before the advent of the electric light, the widespread use of lighting tools candles, kerosene or gas lamps. September 1878, Edison invented the electric light decision. He read a lot of books on electric lighting, determined to create a cheap, rable, and safe and convenient lamp. Edison made the light carefully summed up the failure of previous experience, to develop a detailed test plan. In 1879, after several experiments, Edison finally decided to make carbon wire filament. Electric light the most famous is a 19th century invention, Edison is also the most brilliant contributions to mankind.
How Edison invented the electric light 300 Words
Edison invented the electric light
On a snowy afternoon, Edison's mother suddenly fell ill. In the evening, Dad invited a doctor. It turned out that my mother had acute appendicitis and needed surgery immediately.
There were no electric lights at that time, and the light of the oil lamp was very dim. It was very dangerous to use oil lamp lighting for surgery. The doctor hesitated. Mom moaned in pain, dad rubbed his hands helplessly, and Edison stood aside and looked at his mother anxiously. Time passed minute by minute, and Edison's palms became sweaty. Suddenly, his eyes lit up and he said: Doctor, "I have a way." After saying that, Edison took out all the oil lamps. The doctor looked at it, shook his head and said, "These lamps are arranged in a circle to block your hands!" Unexpectedly, Edison moved a large mirror, placed the oil lamp on the box, and placed the mirror behind the oil lamp. This way, not only did it not block his hands, but the light Much brighter too.
After the doctor successfully completed the operation, he happily said: "My child, it was you who saved your mother with your wisdom."
When mother woke up, Edison took her mother's He held his hand and said seriously: "Mom, it's so inconvenient to have no sun at night. I want to create a 'sun' at night."
Later, through unremitting efforts, Edison finally invented the electric light.
The story of Edison’s invention of the electric light in 300 words
The story of Edison’s invention of the electric light:
In the early 19th century, people used oil lamps , candles, etc. for lighting, but if you are not careful, a fire may occur. In order to liberate mankind from the constraints of night, Edison was determined to make electric lights to bring light to mankind.
Edison invented the electric light and conducted more than 1,500 experiments but could not find a suitable material for electric light filament. After working tirelessly on 1,600 experiments with heat-resistant materials and more than 600 kinds of plant fibers, he created the first carbon filament light bulb, which can burn for 45 hours at a time.
Later, he continued to improve the production method on this basis, and finally invented a bamboo filament light bulb that could burn for 1,200 hours. This took a full 30 years.
(3) The story of the electric light is about 300 words. Extended reading:
On October 21, 1879, the American scientist Edison invented the electric light, that is, the incandescent lamp, which is a kind of electric light that passes electricity. , a lamp that uses a resistor to heat a thin wire to incandescence to emit light. Edison was the world's first inventor to use the principles of mass production and his industrial research laboratories to produce inventions. Edison has more than 1,500 patents in his name. Founded General Electric Company in 1892.
An electric light bulb, or electric bulb, its precise technical name is an incandescent lamp, is a lamp that uses electricity to heat a fine wire (usually tungsten wire in modern times) to incandescence by using resistance to emit light. . The periphery of the light bulb is made of glass, which keeps the filament under vacuum or low-pressure inert gas to prevent the filament from oxidizing at high temperatures.
It is generally believed that the electric light was invented by American Thomas Edison. But if there is serious research, another American, Henry Goebbels (Heinrich G?bel), had invented the same principle and material and a reliable light bulb decades earlier than Edison. Before Edison, many other people had also invented the electric light bulb. He has made many contributions to inventions.
In 1801, the British chemist David electrified platinum wire to emit light. He also invented the electric candle in 1810, which used arc lighting between two carbon rods. In 1854, Henry Goebbels used a carbonized bamboo filament and placed it under a vacuum glass bottle to energize it and emit light. His invention appears today to be the first practical incandescent light bulb. The light bulb he tested at that time could last for 400 hours, but he did not immediately apply for a design patent.
The story of Edison’s invention of the electric light: 300 to 350 words
The story of Edison’s invention of the electric light:
Edison and his assistants tried platinum several times , but this kind of platinum with a higher melting point, although it extends the lighting time of the electric lamp a lot, it still has to be automatically turned off and then automatically illuminated from time to time, which is still not ideal.
Edison was not discouraged and continued his experimental work. He successively tried barium, titanium, indium and other rare metals, but the results were not satisfactory.
Next, he and his assistants classified the 1,600 heat-resistant materials and began testing, and found that platinum was the most suitable. Due to the improved extraction method, the vacuum inside the glass bubble is achieved. Lamp life has been extended to 2 hours. But this kind of lamp made of platinum is too expensive. Who is willing to spend so much money to buy an electric lamp that can only be used for 2 hours?
Edison saw this lamp made of cotton yarn Scarf, Edison suddenly had an idea in his mind:
Yes! The fiber of cotton yarn is better than that of wood. Can this material be used?
He hurriedly pulled off the scarf. A piece of cotton yarn was carefully put into the glass bubble, and the effect was really good.
Edison was very happy and made many carbon filaments made of cotton yarn and conducted many experiments. The life of the light bulb was extended by 13 hours, and later reached 45 hours.
"I hope it lights up for 1,000 hours, 16,000 hours!" Edison said.
Finally, Edison finally chose bamboo. He first took out a piece of bamboo and put it into a glass bulb. After turning on the electricity, the bamboo filament bulb lit up continuously for 1,200 hours!
He finally made an electric lamp that he was satisfied with.
The Story of Edison Inventing the Electric Light"
Before the invention of the electric light, when it got dark, people could only rely on moonlight, torches, candles, and oil lamps lit by walnut oil for lighting. .
Today, our nights are brightly lit, which is the result of a great American inventor, Edison.
More than a hundred years ago, people began to use the earliest The electric light - arc lamp. However, the 30-year-old Edison saw that the arc lamp was weak and easy to hurt his eyes, and he had to constantly replace the charcoal strips used for burning. Regardless of others laughing at him for being a fool, he boldly proposed to The arc lamp changed to a white light lamp, and he wanted to make the electric lamp brighter and last longer.
It was not easy to find a suitable filament material. Edison did countless different experiments, but the results all failed. But he He still insisted on working in the laboratory until early morning every day. When he was tired, he would put his head on two or three books and lie under the experimental table to sleep for a while.
Finally one day three years later, Edison fanned the banana A piece of bamboo filament was torn into thin filaments and made into a filament. As a result, he invented an incandescent electric lamp - the bamboo filament electric lamp.
Several years later, he used tungsten filament instead of bamboo filament. , and finally invented the incandescent electric light that people still use today - the tungsten electric light
The scientist's short story is about 300 words
Watt built the steam engine
One summer On the morning of the same day, the weather was fine, and the thrush sang a sweet song on the tree. On the campus of the University of Glasgow, England, a man was walking. He walked slowly up and down the green lawn. Sometimes he looked at the vast sky, sometimes at Hutan's playground, sometimes he frowned... Suddenly, a smile appeared on his face, and his mood suddenly brightened. He figured it out and came up with an effective solution to the steam engine. He ran happily, his feet flying into the air. In an instant, his figure appeared on the console that had been with him for many years. He was Watt, the inventor of the steam engine. Someone once said: "Watt invented the steam engine because he had superhuman genius and wisdom." This is not true. In order to illustrate this problem, let’s tell a story about Watt’s diligent study, hard work, and inventions.
The Enlightenment of Water Vapor
With the development of intellectual education, Watt developed a strong interest in some objectively existing things, and developed curiosity and a desire to study. This laid a good foundation for his future invention of the steam engine.
In Watt’s hometown, the small town of Greenock, every household lights a fire to boil water for cooking. Who has ever paid attention to such a common thing? Watt paid attention. There is Huai? He is in the kitchen watching his grandmother cooking. There is a pot of boiling water sitting on the stove. The water is boiling. The lid of the pot made a snapping sound and kept jumping up. Watt observed it for a long time and felt very strange. He couldn't figure out the reason, so he asked his grandmother: "What kind of thing makes the lid of the pot jump?"
Grandma replied: "The water is boiling, that's it." "
Watt was not satisfied and asked again: "Why does the water jump when the lid is opened? Is something driving it? "
Maybe my grandmother was too busy to answer him correctly, so she said impatiently: "I don't know. The children asked inquisitively what the meaning of this was. "
Not only did Watt not find the answer from his grandmother, but he was unjustly criticized. He felt very uncomfortable, but he was not discouraged.
For several days in a row, whenever he did During the meal, he squatted next to the stove and observed carefully. At first, the lid of the pot was stable. After a while, the water started to boil and made a splashing sound. The steam in the pot came out and pushed the pot. The lid jumped. Steam kept rising, and the lid kept beating, as if there was a magician hiding inside, doing tricks.
Watt was so happy that he almost screamed. He opened and closed the lid of the pot, and then opened it again to verify again and again. He also covered the cup and spoon where the steam came out. Watt finally figured out that it was the water vapor that pushed the kettle lid to beat. The power of this water vapor was really quite big.
Just when Watt was in high spirits and ecstatic, his grandmother spoke again: "You kid, you don't know what to do, what's the fun in a kettle? Get out of my way!" She said casually.
His grandmother was too impatient and subjective. This casual remark almost dampened Watt's self-esteem and enthusiasm for exploring scientific knowledge. The old man doesn't understand Watt's heart at all. I wonder what a great revelation "water vapor" has to Watt! Isn't the physical phenomenon of water vapor pushing the kettle lid beating the source of Watt's understanding of the invention of the steam engine?
In 1769, Watt changed the steam engine into a single-action engine with greater power. Later, after many studies, he completed the trial production of a new steam engine in 1782. The linkage device changed the single type into rotary motion, and the perfect steam engine was invented successfully.
Due to the invention of the steam engine and the developed coal and iron industry in Britain at that time, Britain became the first in the world to use steam to promote iron production. In the 19th century, the reform of maritime transportation began, and some countries entered the so-called "steamship era". Since then, ships have traveled on the vast ocean, and coal mines, factories, and trains have followed. The steam engine was used everywhere. Manual labor was liberated and the economy developed. This is certainly the result of the invention of the steam engine. Therefore, Watt is famous in the world. Watt's life was full of hardships and struggles, and the road he traveled was so bumpy. He benefited mankind through hardships and setbacks, and opened up new milestones for mankind. Watt attached great importance to learning and practice. , enriched his wisdom; practice produced fruitful results
It is said that on the first day when Einstein came to the Institute for Advanced Study in Princeton, the administrator asked him what tools he needed, and he replied: “I think a table or stand, a chair and some paper and pens will do. Ah, yes, and a big wastebasket. The manager asked strangely: "Why do you want a big one?" "Einstein replied: "So that I can throw all the mistakes into it. "The world has always been like this. Every ordinary or great person will make mistakes. Only people like Einstein, who constantly discard mistakes, can see a way forward.
Scientist's Short story of 300 words
The invention of the electric light
Lamp is a great invention for mankind to conquer the night. Before the 19th century, people used oil lamps, candles, etc. to illuminate. Although this has broken through the night, But it still failed to completely liberate mankind from the constraints of night. Only the birth of the generator enabled mankind to use various electric lights to brighten the world, turn night into day, and expand the scope of human activities. Gain more time to create wealth for society.
It was the American inventor Edison who really invented the electric light and made it bright. He was the child of a railroad worker. He dropped out of elementary school and sold newspapers on the train. Edison was an extremely diligent person who liked to do various experiments and create many ingenious machines. He was particularly interested in electrical appliances. Since Faraday invented the motor, Edison was determined to create electric lights and bring light to mankind.
After carefully summing up the failed experiences of his predecessors in manufacturing electric lamps, Edison formulated a detailed test plan and conducted tests in two aspects: first, classifying more than 1,600 different heat-resistant materials; second, improving evacuation equipment , so that the light bulb has a high vacuum. He also conducted research on new generators and circuit shunt systems.
Edison tested more than 1,600 heat-resistant luminescent materials one by one, and only platinum wire was the best. The energy was good, but platinum was extremely expensive, so a more suitable material had to be found. In 1879, after several experiments, Edison finally decided to use carbon wire as the filament.
He sprinkled a piece of cotton silk with charcoal powder, bent it into a horseshoe shape, put it in a crucible, heated it, made it into a filament, put it in a light bulb, and then used an air extractor to remove the air from the light bulb. The light turned on and could be used continuously. 45 hours. In this way, the world's first carbon filament incandescent lamps came out. On New Year's Eve 1879, Lopack Street, home to the Edison Electric Light Company, was brightly lit.
In order to develop electric lights, Edison often worked more than ten hours a day in the laboratory, sometimes testing for several days in a row. After he invented carbon filament as a filament, he successively tested more than 6,000 plant fibers, and finally Bamboo filaments are selected, charred in a high-temperature sealed furnace, and then processed to obtain carbonized bamboo filaments, which are then installed into the light bulb. This increases the vacuum of the light bulb again, and the light can be continuously lit for 1,200 hours. The invention of the electric light caused the gas stock price to plummet 12% in three days.
Following Edison, in 1909, the American James Curry invented the use of tungsten filament instead of carbon filament, which greatly increased the efficiency of electric lamps. Since then, electric lights have leapt to a new level, and various lamps such as fluorescent lamps and iodine-tungsten lamps have sprung up on the lighting stage.
Lamps turn darkness into light, making the world more dazzling and colorful.
A 300-word essay on the dark fairy tale of candles, electric lights and flashlights
During my schooling career, countless teachers have taught me the principles of life. In that faint past, there are faint memories. That faint memory has become an eternal constellation in my mind. Each and every teacher is as innocent and shining as a star. Their love is deeply imprinted on the river in my memory, and the flow will never end. In the galaxy of my memories, there are so many stars, which makes me feel extremely proud, proud! I am happy to have these teachers who are as bright as stars. They have given me the source of knowledge!
No matter how long the memory is, whenever I think of the teacher, I am still passionate; whenever I face a familiar teacher, at that moment, those little things always arouse my love for the teacher. The gratitude that has been stored in our hearts for a long time; the love between our teachers and students, releases our hearts to the universe, is fixed in eternity, and creates a monument of "humanity". Teachers are like red candles, flowing their own fat to the world without hesitation, cultivating flowers of comfort and forming fruits of happiness. In my memory, the teacher's eyes are like the most beautiful notes, singing the most beautiful songs; in my mind, the teacher's eyes are like a wooden bridge, swinging out our naughtiness, in order to prevent us from jumping into the quagmire of life. The abyss; the teacher's gaze is like a path, winding and winding, measuring our childishness in order to prevent us from being trapped by thousands of difficulties. The teacher's gaze is like a beam of electric light, which flickers on and off, illuminating our confusion in order to prevent us from crying in the clouds and mist of life. In my eyes, the teacher's gaze is like the gentle wind, the gentle breeze. It is its greetings to the seedlings; the teacher's gaze is a long line, and the longness is its concern for the students; the teacher's gaze is the deep sea, and its deep love for the world. The teacher is a flower in our life. It bloomed for us, then withered, and then turned yellow. The teacher is a lamp that lights up for us when we study hard, and then goes out. Teacher! You are our street light, lighting up our journey of life. Teacher! You are our flower protector, cultivating thousands of colorful flowers. At this time, we want to say: Teacher, thank you for your hard work. You can also contribute. You will always be the candle in our hearts that will never go out. Because of your candle, we will have our light!
300 words of Edison’s success story
When Edison was 8 years old, he successfully used his wisdom to save his mother.
At that time, Edison lived in a small mountain village in the United States. One night, Edison's mother suddenly had a stomachache and rolled on the bed. Edison's father hurriedly rode to fetch a doctor. After a while, the doctor came and after diagnosis, he concluded that Edison's mother had acute appendicitis and needed immediate surgery. But there was no kerosene lamp at home, and the doctor said the light was too dark to operate. Edison's father was jumping around anxiously, and Edison's mother was sweating profusely in pain. Little Edison thought about it and remembered that he and his friends were playing with lenses this morning. The lenses would reflect when facing the sun.
Thinking of this, Edison ran out like a gust of wind and borrowed four large mirrors and a kerosene lamp from his neighbor's house. Putting the kerosene lamp in front of the big mirror, the room suddenly lit up. The operation was successful and my mother was saved. Dad praised Edison as a smart child.
This story tells us that to be a thoughtful person in life, we must also learn this kind of wit from Edison!