Otaku Engineer in Great Tang Dynasty

Last year, when Li Zexuan was making telegraphs and voltaic batteries in his workshop, he used carbonized bamboo silk to make a energization test. The bamboo silk can emit a bright light when it is energized, but it is only for a moment. After a moment of brilliance, the bamboo silk will be heated and burned and turned into ashes!

　　 Although this experiment failed, it at least proved that carbonized bamboo silk can be used as a filament. As long as it is not allowed to come into contact with oxygen, its service life can be guaranteed!

　　 Now Li Zexuan uses candles to consume oxygen to ensure that there is no oxygen in the bulb. In this way, the light bulb made of carbonized bamboo silk can be used for a long time!

In 1854, the German watchmaker Henry Gobel, who immigrated to the United States, used a carbonized bamboo wire in a vacuum glass bottle to make the first practical electric lamp, which lasted for 400 hours, but he did not Apply for patents in time.

In 1874, two electrical technicians in Canada applied for a patent for an electric light: nitrogen was filled under a glass bulb to emit light with an energized carbon rod. However, they did not have enough financial resources to continue to perfect the invention, so they sold the patent in 1875. To Edison. After purchasing the patent, Edison tried to improve the filament and finally produced a carbonized bamboo filament lamp in 1880 that could last for 1,200 hours.

　　 This is already quite powerful. If you know the life of the tungsten filament lamp, it is only about 1500 hours. Before discovering and mining tungsten ore, it is undoubtedly the wisest choice to replace the tungsten filament with carbonized bamboo filament!

　　 "Xiao Xuan! The batteries are here! Five are enough~?"

　　 Following Li Zexuan’s instructions, Yan Shaoning took five voltaic batteries and walked into the laboratory.

　　 Li Zexuan frowned, and said: "It should be not enough! Try it first, let's talk about it~!"

The voltage of one piece of voltaic battery that supplies electricity to the telegraph is about one volt, and the current is about 500 milliamperes. Five pieces are connected in series, and the voltage is only about five volts. The light bulb in his hand is about five volts. It's not small. The carbonized bamboo filaments inside are wound into a spiral shape, so the longer the length, the higher the resistance value. If you want to light it up with a voltage of five volts and a current of 500 milliamperes, it is probably a bit choking!

After all, Li Zexuan connected the five batteries in series, and then led out two copper wires from the top of the bulb, one end connected to the positive pole and one end to the negative pole. Suddenly, the carbonized bamboo filaments in the bulb lit up with a faint light. , This light is not fleeting like the previous experiment, but it shines continuously and steadily. Li Zexuan could not help but breathe a sigh of relief when he saw it.

　　 "It's on! It's on! Shanchang! This light is really on~!"

　　 In the laboratory, Mo Lingwei could not help cheering excitedly when he saw the faint light from the electric light.

　　 "Hmm! I just feel that the brightness is not enough!"

　　 Yan Shaoning looked up and down for a while, and said with some regret.

　　 "That's because the voltage is too low! If the voltage is increased, it will definitely be brighter, at least much brighter than a candle!"

　　 Li Zexuan smiled and said.

　　 "Yeah! Then can Xiao Ningzi hold a few more batteries? Xiao Ningzi, go!"

　　 Mo Lingwei stubbornly said to Yan Shaoning.

　　 "Good, good! Then I will get five more batteries!"

　　 Facing the "Goddess' Will", how can Yan Shaoning refuse to follow? He quickly stood up and was about to walk outside the house.

In other words, the power generation efficiency of the voltaic battery made of salt water is very low, so many small compartments are integrated in each voltaic battery to ensure that the voltage of each battery can be used, so the weight of each battery is not It's light, and five yuan together is more than ten kilograms heavier. It can be said that it is difficult for Yan Shaoning!

　　 Seeing this, Li Zexuan quickly said:

"Forget it! No need! Since this light can be on all the time, it means that our idea of ​​making lights is correct. It won't be too late to do the experiment when the dam is opened and the generator is officially generating electricity! Work hard, we need to make several sets of electric lamps with different voltage resistance values, and save them for experiments with generators and transformers! After all, no one knows what the voltage from the generator is? The voltage after the transformer is converted is How many?"

　　 What is the most lacking thing in the academy now? That is all kinds of instruments and measuring tools!

First of all, due to the constraints of process conditions, various ancient measuring tools are actually not accurate. Although the accuracy of rulers, scales and measuring buckets can meet daily needs, if they are used in precision manufacturing, they are far from enough. !

Now because of the Bahe Hydropower Station, Lantian County will soon be able to use electricity. When it comes to electricity, it also needs measuring instruments such as voltmeters, ammeters, and ohmmeters. These things are not easy to manufacture, and they are formulated for these new physical quantities. The unit standard must be approved by most people!

Li Zexuan intends to pull away later and organize the elite forces of the academy to establish the Datang Institute of Metrology to unify the old measurement units and formulate new measurement standards for the new physical quantities. In addition, the measurement used in future engineering Tools and measuring instruments require Datang Institute of Metrology to make a standard instrument. All subsequent related instruments must be calibrated according to this standard instrument to ensure that the error is within the acceptable range!

　　 After the establishment of Datang Metrology Institute, modern measurement units such as "meters, kilometers, grams, kilograms, volts, amperes, watts, kilowatts" and so on, Li Zexuan can continue to use them!

Moreover, if you want to engage in precision manufacturing in Datang, the first step is not to build machines, but to unify measurement standards and make more precise measurement tools. Only in this way can more precise machine tools be manufactured. Parts!

　　 There is an old saying that "the slightest loss is a thousand miles away." It is most appropriate to use this sentence in the field of precision manufacturing!

　　 "Oh! That's okay! But Shanchang, what can I do to make the lamp filaments have different voltage resistance values?"

　　 Mo Lingwei nodded thoughtfully, and then wondered again.

　　 Yan Shaoning also set his sights on Li Zexuan. He has not mastered the electrical part of the "Physics" textbook as well as Mo Lingwei has not understood well. He naturally does not understand the problems that Mo Lingwei does not understand!

Li Zexuan thought for a while and explained: "Under the same voltage, the smaller the resistance of the filament, the greater the current passing through it. For example, when we use a wire directly connected to the positive and negative ends of the battery, Although the voltage of the battery is small, the resistance of the wire is almost close to zero, and the current passing through it will be infinite, and the temperature of the wire and the battery will rise sharply! So only the larger the resistance value, the voltage that it can withstand The bigger it is!

　　The reason why I made the filament into a spiral is to increase the length of the filament. The longer the length, the greater its resistance. On the other hand, the filament is made into a spiral, which is actually an inductor! In a DC stabilized circuit, the inductance is equivalent to a short circuit, and the resistance value can be ignored!

　　 But in sinusoidal alternating current, the inductance will form a certain impedance to the current! There will be voltage on both sides, and there will also be current through. But the lower the frequency of the sinusoidal alternating current, the less the inductance will hinder it, which is equivalent to a low pass filter.

　　 So making this spiral filament is more conducive to increasing the voltage resistance of the bulb! "

　　 Mo Lingwei heard the words, digested it earnestly for a while, then nodded and said: "Well! Shanchang, I understand! Then let me do the lights with different voltage resistance values!"

　　 Li Zexuan just saw the whole process of making electric lights. She saw it in her eyes. There was no difficulty in the whole, so she took the initiative to ask for it.

　　 Li Zexuan nodded, and stood up and said: "That's good! Just work hard, Girl Mo!"

　　 After all, he looked at Yan Shaoning on the side, and then went out.

　　 "Hey! Weier, I'll do it for you!"

　　 "Huh! Who wants your help?"

　　 "No! You can't let you do such a rough job as drilling holes, right?"

　　 "Hmm...it seems to make some sense..."

　　 Outside the house, Li Zexuan heard the conversation between the two and couldn't help but shook his head, and sighed as he walked: "Hey! What a happy couple!"

　　...................

　　 "Open the gate! Release the water!"

　　 Two days later.

　　 All the canal construction and waterwheel installation projects in Lantian County have been completed. In Lantian County, hundreds of thousands of mu of fertile fields that have been drought for more than half a month are finally able to be re-moisturized today!

Next to the Bahe Dam, with an order from Li Zexuan, the dam opened a gate. The surging water in the dam rolled down, and the water poured directly into the ditch through the waterwheel, and then happily followed the direction of the ditch. Pentium surging!

　　 "There is water! There is water~!"

　　 "Finally, water can flow into the field! Great! Great!"

　　 "Master Hou is kind! If there is a severe drought this year, our crops may not be harvested!"

　　 "Yeah! Yeah! I heard that this dam took hundreds of thousands to build!"

"There is also this aqueduct. I heard that all the cement used in it was produced by Master Hou himself. You can't buy this thing outside, but Master Hou used it to repair the canal for us. We must spend all our lives. I am grateful to Lord Hou for his kindness!"

　　 "That's a must! To stand such a good Lord Hou, it is our ancestors who burned incense! If anyone does not appreciate the kindness of Lord Hou, who is a white-eyed wolf and should be poked in the backbone!"

　　 Seeing a large amount of river water pouring into the cement ditch not long after construction, the people on the bank of Bahe burst into cheers.

　　 "He county magistrate, immediately send people to various villagers to see which villagers do not have access to water. If there is a situation, come and report immediately~!"

　　 On the bank, Li Zexuan put his hands on his back and gave light instructions.

　　 It is said that Lantian County is the first county to divert water into the fields in the surrounding counties of Chang'an City. The main reason is that the construction of the canal was started early and the construction of the canal was completed early. And because of the dam, the abundant water resources here in Lantian County provide a huge convenience!

　　 So, when other counties were still busy building canals and loading water trucks, Lantian County had already introduced the water from the Bahe Dam into the fields!

County magistrate He was full of red light at this time. Lantian County was the first county to bring water from the river to the fields. He, who was the magistrate, also had light on his face. It would not be useless for him to take all the county officials with him in recent days. The officials worked hard.

　　 Hearing Li Zexuan's instructions, he quickly handed his hands over: "Don't worry, Hou Ye, you have already arranged people to station in various villages before you get out of office~! They will come over and report to the next official soon!"

　　 Li Zexuan nodded in satisfaction, and said: "Yeah! Not bad! You will report to me later!"

　　 "Shanchang, a generator has started to run, and relays and transformers have been installed. Would you like to check it out?"

　　 At this moment, Mo Huai and Mo Lingwei and his group walked over the embankment of the dam and said to Li Zexuan.

　　 "Try! Of course I have to try~!"

　　 Li Zexuan's spirit was shaken. It is important to open the gates and release water and irrigate the farmland, but whether the generator can generate electricity is even more important. This relates to whether Lantian County can be directly brought from the farming era to the power era! He took two steps forward and said:

"Mr. Mo, first cut off the generator's output power through the relay switch, then connect the lights in parallel, and then turn on the relay switch to see if the lights can be energized normally! The generator outputs high-voltage alternating current. If you are not careful, you will be in danger! You must pay attention to the safety of electricity, and it is best to wear insulating rubber gloves~!"

　　 Mo Huai nodded solemnly, and said, "Elder Mountain! The old man understands!"

　　 After that, he turned and headed towards the control room of the dam.

　　 After a while, under the suspicious eyes of the surrounding people, someone began to erect wires next to the river bank. There were a dozen fist-sized glass **** on the wires, and everyone couldn't help but talk.

　　 "What is Hou Ye doing? These threads don't look like twine!"

　　 "Of course it's not hemp rope. The outside of this thread is rubber. As for what's inside, I don't know!"

　　 "Rubber? This thing is expensive! I don't know what the bread is~www.ltnovel.com~ Hou Ye is so willing!"

　　 "I really want to know what that glass ball is for! I feel that Master Hou is going to make a new trick again!"

　　 The people onlookers talked a lot. The gentlemen of Yanhuang Academy who came to "watch the ceremony" all clenched their fists, praying in their hearts that this first generator experiment would be successful!

The manufacture of generators and the construction of power stations are inseparable from the silent contributions of the teachers of the academy. The dam can be built by civilians, as long as the drawings are drawn, but the hydropower station is different. This must have people who are proficient in this area. Guide the whole process!

As the first killer project of Yanhuang Academy, the teachers of the Academy, especially the teachers of the Physics Department, have contributed a lot to the construction of the hydropower station in the past few months. As for the success or failure, just look at this time. Experimented!

　　 "Shanchang, everything is ready, do you turn on the switch to turn on the lights?"

　　 Half an hour later, Mo Huai walked over again and asked Li Zexuan.

　　 "Power on! Be careful of everything!"

　　 Li Zexuan clasped his hand secretly and nodded.

　　 He is also nervous and excited now!

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