Otaku Engineer in Great Tang Dynasty Chapter 1412: The lights are shining in the world, green water surrounds Lantian! (Next) (Thanks Han…

　　 When Li Zexuan was making telegraphs and voltaic batteries in his workshop last year, he used carbonized bamboo silk to make a energization test. The bamboo silk can emit a bright light when it is energized, but only for a moment. After leaving 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, it can guarantee its service life!

　　 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 a patent in time.

　　 In 1874, two electrical technicians in Canada applied for a patent for an electric lamp: Filling a glass bulb with nitrogen gas to emit light with an electrified carbon rod, but they did not have enough financial resources to continue to perfect the invention, so in 1875 Sold the patent 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 most wise choice to replace the tungsten filament with carbonized bamboo filament!

　　"Xiaoxuan! The battery is 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 not be enough! Try it first, let's talk about it~!"

The voltaic battery manufactured by 　　, which supplies electricity to the telegraph, has a voltage of about one volt and a current of about 500 milliamperes. The five pieces are connected in series, and the voltage is only about five volts. This light bulb is not small in size. The carbonized bamboo filaments inside are wound into a spiral, so the length is longer, and the resistance value will be higher. If you want to light it up with a voltage of five volts and a current of 500 milliamperes, it is estimated Some are choking!

　　 After all, Li Zexuan connected five batteries in series, and then led out two copper wires from the top of the bulb. One end was connected to the positive electrode and the other was connected to the negative electrode. Suddenly, the carbonized bamboo filament in the bulb lit up. The faint light, this light is not fleeting like the previous experiment, but is on for a long time and steadily. Li Zexuan could not help but breathe a sigh of relief when he saw it.

　　"It's on! It's on! The mountain is long! This light is really on!"

　　 In the laboratory, Mo Lingwei could not help cheering excitedly when she 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.

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

　　 Mo Lingwei puffed up her lips and ordered Yan Shaoning.

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

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

　　 It is said that the power generation efficiency of the voltaic battery made of salt water is very low, so every voltaic battery is integrated with many small compartments to ensure that the voltage of each battery can be used, so each battery The weight of this is not light, and the weight of five yuan is more than ten catties. It is hard to say for Yan Shaoning!

　　 Li Zexuan saw this and 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 is not too late to do the experiment when the dam is opened and the generator is officially generating electricity! At this moment, we need to make several sets of electric lamps with different withstand voltage values, and save them for experiments with generators and transformers in the future! After all, no one knows what the voltage of the generator is? After the transformer is converted What is the voltage?"

　　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 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 for these The establishment of unit standards for new physical quantities 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 Metrology Institute to unify the old measurement units and formulate new measurement standards for new physical quantities. In addition, it will be used in engineering in the future. The measurement tools and measuring instruments obtained 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. For precision parts!

　　 There is an old saying, "A little bit is lost, but a thousand miles away." It is most suitable to use this sentence in the field of precision manufacturing!

　　 "Oh! That's okay! But Shanchang, what can I do to make the voltage resistance of the lamp filament different~?"

　　 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 thorough as Mo Lingwei, and he does not understand the problems that Mo Lingwei does not understand, he naturally 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 through it. For example, when we use a wire directly connected to the positive and negative terminals of the battery. At the end, although the voltage of the battery is small, the resistance of the wire is almost close to zero, 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, it can withstand The higher the voltage value!

　　 The reason why I made the filament into a spiral shape is to increase the length of the filament. The longer the length, the greater its resistance. On the other hand, the spiral shape of the filament is actually equivalent to 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 for a long time, then nodded: "Yeah! 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, and overall there was no difficulty, so she took the initiative to ask for it.

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

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

　　 "Hey! Wei Er, I'll do it for you!"

　　 "Huh! Who wants your help?"

　　 "No! You see drilling such a rough job, you can't let you do it with a girl, right?"

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

　　Outside the house, Li Zexuan heard the conversation between these two people 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 all ended. In Lantian County, hundreds of thousands of mu of fertile fields that have been dry for more than half a month are finally able to be re-moisturized today!

Next to the 　　Bahe Dam, following Li Zexuan’s order, the dam opened a gate. The surging water in the dam rolled down, and the water poured directly into the ditch through a waterwheel, and then happily moved along the canal The direction is endless, surging!

　　 "There is water! There is water~!"

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

　　 "Master Hou is kind! Otherwise this year's drought, our crops may not be harvested!"

　　 "Yeah! Yeah! I heard that the dam Houye spent hundreds of thousands to build!"

　　"There is also this aqueduct. I heard that all the cement used in it was produced by Lord Hou himself. You can’t buy this thing outside, but Lord Hou brought it to us to repair the canal. We must I want to remember Master Hou’s kindness for the rest of my life!"

　　 "That's a must! To stand such a good Lord Hou, it is our ancestors who burned incense! Whoever does not appreciate Lord Hou’s kindness, who is a white-eyed wolf, 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 each village to see which village does not have access to water. If there is a situation, come and report immediately~!"

　　 On the shore, Li Zexuan put his hands on his back, and gave lightly.

　　 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 launched 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, while 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!

　　 The county magistrate He is full of red light at this time. Lantian County is the first county to bring water from the river to the fields. He, the county magistrate, also has light on his face. To say it, it’s not in vain that he carried All county officials worked hard.

　　 Hearing Li Zexuan's order, he quickly slammed his hands: "Don't worry, Hou Ye, people have already been stationed in various villages before getting off the government~! 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 running, and the relay and transformer have been installed. Would you like to check it out?"

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

　　 "Try! Of course I have to try~!"

　　 Li Zexuan's spirit was shocked. It is important to open the gates to 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 output power of the generator through the relay switch, then connect the light in parallel, then turn on the relay switch to see if the light can be energized normally! The output of the generator is High-voltage alternating current, a little carelessness, there will be life-threatening! Be sure to pay attention to the safety of electricity, it is best to wear insulated rubber gloves~!"

　　 Mo Huai nodded solemnly, and said: "The leader of the mountain! The old man understands!"

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

　　 After a while, under the suspicious gaze of the surrounding people, someone started to set up electric 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 in~IndoMTL.com~Hou Ye is so willing!"

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

　　The people onlookers talked a lot, and the gentlemen of Yanhuang Academy who came to "watch the ceremony", all of them clenched their fists tightly, 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 be proficient in this aspect. Knowledgeable people 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 hydropower stations in the past few months. As for the success or failure, it depends Today is the experiment!

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

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

　　 "Power on! Be careful of everything!"

　　Li Zexuan squeezed his hand secretly and nodded.

　　 He is also nervous and excited now!

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