Last year, when Li Zexuan made a telegraph and voltaic battery in the workshop, he used carbonized bamboo wire to do a power-on test, the bamboo wire can emit bright light at the moment of power-on, but it is only for a moment, after leaving a moment of brilliance, the bamboo wire will be heated and burned and turned into ashes!

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

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

In 1854, Henri Goebel, a German watchmaker who immigrated to the United States, made the first practical electric lamp from a carbonized bamboo wire placed in a vacuum glass bottle, which lasted for 400 hours, but he did not apply for a patent in time.

In 1874, two Canadian electrical technicians applied for a patent for an electric lamp: nitrogen gas was filled under a glass bubble to emit light with an electrified carbon rod, but they did not have the financial resources to continue perfecting the invention, so they sold the patent to Edison in 1875. Edison bought the patent and tried to improve the filament, and finally in 1880 he made a carbonized bamboo filament lamp that could last for 1,200 hours.

This is already quite powerful, to know that the life of tungsten lamp, is only about 1500 hours, before the discovery and mining of tungsten ore, it is undoubtedly the wisest choice to replace tungsten wire with carbonized bamboo wire!

"Xiao Xuan! The battery is here! Is five enough~? ”

According to Li Zexuan's instructions, Yan Shaoning brought five voltaic batteries and walked into the laboratory.

Li Zexuan frowned and said, "It shouldn't be enough!" Let's try it first~! ”

The voltaic battery made by the workshop to supply the telegraph to energize, the voltage of one piece is about one volt, the current is about 500 milliamperes, the five pieces are connected in series, and the voltage is only about five volts, and the light bulb in his hand is not small, the carbonized bamboo wire in it is wound into a spiral, so the length is longer, the resistance value will be relatively high, the voltage of five volts and the current of 500 milliamperes to light it up, it is estimated that some are enough!

After that, Li Zexuan connected the five batteries in series, and then from the top of the bulb, two copper wires were drawn, one end was connected to the positive electrode, and the other end was connected to the negative electrode.

"It's lit! It's lit up! Mountain Chief! This electric light is really on~! ”

In the laboratory, Mo Lingwei couldn't help but cheer excitedly when she saw the faint light from the electric light.

"Hmmm! I just feel that the brightness is a little insufficient! ”

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

"That's because the voltage is too small! If you increase the voltage, it will definitely be brighter, at least much brighter than a candle! ”

Li Zexuan smiled and said.

"Hmmm! Wouldn't it be okay for Xiao Ningzi to hold a few more batteries? Xiao Ningzi, go! ”

Mo Lingwei pursed her mouth and instructed Yan Shaoning.

"Good, good! Then I'm going to get five more batteries! ”

In the face of the "will of the goddess", how dare Yan Shaoning disobey? He quickly stood up and was about to go outside.

It is said that the power generation efficiency of the voltaic battery made of salt water is very low, so many small compartments are integrated into each voltaic battery to ensure that the voltage of each battery can be used, so the weight of each battery is not light, and the five together weigh more than ten catties, which is difficult to say for Yan Shaoning!

Seeing this, Li Zexuan hurriedly spoke:

"Forget it! No more! Since the electric light can be lit all the time, it means that our idea of making electric lights is right, and it is not too late to do experiments when the dam is opened the day after tomorrow to release water and the generator is officially generated! Taking advantage of this time, we need to make several sets of electric lamps with different withstand voltage values, and keep them for experiments with generators and transformers in the future! After all, no one knows what the voltage of the generator is? What is the voltage after the transformer conversion? ”

What is the academy lacking the most? That's all kinds of instrumentation and measuring tools!

First of all, due to the constraints of process conditions, all kinds of measuring tools in ancient times are actually not accurate, rulers, scales, measuring buckets, although their accuracy can meet daily needs, but if it is used in precision manufacturing, it is far from enough!

Now because of the relationship between the Bahe Hydropower Station, Lantian County will soon be able to use electricity, involving electricity, and need voltmeter, ammeter and ohmmeter and other measuring instruments, these things are not easy to manufacture, and for these new physical quantities to develop unit standards, but also must be recognized by most people!

Li Zexuan plans to wait for a while, 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 the new physical quantities.

After the establishment of the Datang Metrology Institute, Li Zexuan will be able to continue to use these modern measurement units such as "meters, kilometers, grams, kilograms, volts, amperes, watts, and kilowatts"!

Moreover, if you want to engage in precision manufacturing and processing 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 you manufacture more precise machine tools and more precise parts!

There is an old saying called "a small miss, a thousand miles wrong", this sentence is most suitable for use in the field of precision manufacturing and processing!

"Oh! That's fine, too! But the mountain is long, how can I make the voltage resistance value of the lamp filament different~? ”

Mo Lingwei nodded thoughtfully, and then wondered.

Yan Shaoning also set his eyes on Li Zexuan, he didn't have a mastery of the electricity part of the "Physics" textbook as well as Mo Lingwei, and Mo Lingwei didn't understand the problem, so he naturally didn't understand it!

Li Zexuan thought for a while and explained: "In the case of the same voltage, the smaller the resistance of the filament, the greater the current through it, for example, when we use a wire and connect it directly to the positive and negative ends of the battery, although the voltage of the battery is very small, the resistance of the wire is almost close to zero, and the current through it will be infinite, and the temperature of the wire and the battery will rise sharply!" So only the greater the resistance value, the greater the voltage value it can withstand!

The reason why I made the filament spiral is to increase the length of the filament, the longer the length, the greater its resistance, and on the other hand, the filament is made into a spiral, which is actually equivalent to an inductor! In a DC stabilization circuit, the inductance is equivalent to a short circuit, and the resistance value is negligible!

But in sinusoidal alternating current, the inductor forms a certain impedance to the current! There will be voltage on both sides of it, and there will be electric current passing through it. However, the lower the frequency of sinusoidal alternating current, the less the inductor hinders it, which is equivalent to a low-pass filter.

Therefore, making this spiral filament is more conducive to increasing the pressure resistance value of the bulb! ”

Hearing this, Mo Lingwei digested it seriously for a long time before nodding and saying, "Hmm! Mountain Chief, I see! Then I'll make the lamps with different withstand voltage values! ”

Li Zexuan saw the whole process of making the electric light, and on the whole there was no difficulty, so she took the initiative to ask for help.

Li Zexuan nodded, got up and said, "That's good!" It's hard work for the ink girl! ”

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

"Hey, hey! Vier, I'll do it for you! ”

"Humph! Who wants your help? ”

"It's not! You see, such rough work as drilling can't be done by a girl, right? ”

"Hmm... There seems to be some truth..."

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

...................

"Open the gates! Water! ”

Two days later.

All the canal construction and waterwheel placement projects in Lantian County have been completed, and hundreds of thousands of acres of fertile land in Lantian County, which has been dry for more than half a month, can finally be re-moistened today!

Next to the Bahe Dam, with Li Zexuan's order, the dam opened a sluice gate, and the surging river water in the dam rolled down, and the river water poured directly into the ditch through the waterwheel, and then happily went forward and rushed along the direction of the canal!

"There's water! There's water~! ”

"Finally water can flow into the fields! That's great! That's great! ”

"Master Hou is merciful! Otherwise, there will be a big drought this year, and our crops will probably not be harvested! ”

"Yes! Oh, yes! I heard that this dam took hundreds of thousands of dollars to build! ”

"There is also this canal, I heard that the cement used in it is all made by Hou Ye himself, this thing can't be bought outside, but Hou Ye took it to repair the canal for us, we must be grateful for Hou Ye's kindness for the rest of our lives!"

"That's a must! There is such a good Hou Ye on the stall, that is our ancestor burning high incense! Whoever doesn't miss Hou Ye's kindness is a white-eyed wolf and should be poked in the back! ”

Seeing a large amount of river water pouring into the cement ditch that had just been built, the onlookers on the bank of the Bahe River suddenly burst into cheers.

"He County Order, immediately send people to each Zhuangzi to see which Zhuangzi is not connected to water, if there is a situation, come to report immediately~!"

On the shore, Li Zexuan put his hands behind his back and commanded lightly.

It is said that Lantian County is the first county in the counties around Chang'an City to bring water into the field, mainly because the canal construction plan started early, and the canal was also completed early. And because of the dam, the abundant water sources in Lantian County provide a huge convenience!

Therefore, when other counties were still busy repairing canals and loading water trucks, Lantian County had already introduced the water from the Bahe dam into the fields!

He County's order was full of red light at this time, Lantian County was the first county to lead river water into the field, and he was the county commander, and he also had a light on his face.

Hearing Li Zexuan's order, he hurriedly bowed his hand and said: "Don't worry, Master Hou, the next official has already arranged for people to be stationed in various villages before~!" They'll be coming over soon to report back to the lower authorities! ”

Li Zexuan nodded with satisfaction and said, "Hmm! Not bad! You'll report back to me later! ”

"Chief, a generator has started running, relays and transformers have been installed, do you want to take a look?"

At this moment, Mo Huai, Mo Lingwei and their entourage walked over from the embankment of the dam and said to Li Zexuan.

"Try! Of course you have to try~! ”

Li Zexuan's spirit was shocked, although it is important to open the sluice gates and release water and irrigate farmland, it is more important whether the generator can generate electricity normally, which is related to whether Lantian County can be directly brought from the agricultural era to the electricity era! He took two steps forward and said:

"Mr. Mo, after a while, through the relay switch, first cut off the output power supply of the generator, and then connect the lamp in parallel, and then turn on the relay switch to see if the lamp can be energized normally! The generator outputs high-voltage alternating current, and if you are not careful, your life will be in danger! Be sure to pay attention to electricity safety, and it is best to bring insulated rubber gloves~! ”

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

With that, he turned and headed for the dam's control room.

After a while, under the puzzled eyes of the surrounding people, someone began to set up wires next to the riverbank, and there were more than a dozen fist-sized glass balls on the wires, and everyone couldn't help but talk about it.

"Master Hou, what are you going to do? These threads don't look like hemp rope! ”

"Of course it's not hemp rope, this thread is wrapped in rubber on the outside, as for what's inside, it's unknown!"

"Rubber? It's a precious thing! I don't know what the bread is, but Hou Ye is so willing! ”

"I want to know what the glass ball does! I feel that Master Hou is going to do new tricks again! ”

The onlookers were talking, and the gentlemen of Yanhuang Academy, who came to "watch the ceremony", were all clenching their fists tightly at this time, 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 efforts of the teachers of the academy, and the dam can be built by the people, as long as the drawings are drawn, but the hydropower station is different, this must be guided by someone who is proficient in this knowledge!

As the first killer project of Yanhuang Academy, the teachers of the academy, especially the teachers of the Physics Department, have contributed great energy to the construction of the hydropower station in the past few months.

"Mountain chief, everything is ready, do you want to turn on the switch and let the lights power on?"

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

"Power on! Be careful! ”

Li Zexuan secretly clasped his hands and nodded.

He is also nervous and excited now!

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