President of Datang [Transmigration Book]

Li Xi said indifferently: "What can this do?" Playing tricks.

But he swallowed the last four words. The students of Truth Pavilion this afternoon were basically convinced by Li Tan, and he couldn't just care about his pleasure.

While thinking, he put his hand into the water. At first, when his hand just touched the water, he noticed that his fingers were slightly numb, and he felt a little strange in his heart, but he didn't pay much attention to it.

When I touched the copper wire, I felt a tingling sensation instantly, and this tingling sensation even spread to the arm through the gap.

Li Xi let out a strange cry, quickly withdrew his hand, and said in a panic: "This... this... what kind of monster is this? How could it bite?"

Li Tan held back his laughter, walked over and said slowly, "It's electricity."

Li Xi held his hands together, looked carefully and found that apart from a little redness, there was nothing abnormal about his fingers, and the tingling sensation was gone, only a slight numbness remained.

As soon as Li Xi looked up and saw that everyone around him was smiling, he couldn't help but blushed, feeling that he had made a fuss just now.

After all, he was not very old, and he was quite angry at this time. He pretended not to care and shook his hand before saying, "How can you prove that it is electricity? Anyone who has been struck by lightning..."

Li Tan looked at him pretending to be shocked: "So...do you want to be struck by a real lightning once?"

Li Xi stared: "I didn't mean that!"

Li Tan smiled and said: "Okay, okay, I know what you mean, but I must say, this is the feeling after the thunder and lightning have shrunk many times. If it is really the intensity of thunder and lightning, you have already gone to the underworld to report."

Li Xi's face changed, and he wanted to say something, but Tian Shengong couldn't stand it anymore and asked, "Master Shan, why can this small disc generate electricity?"

Li Tan took his own special gloves and explained the principle little by little. Of course, it involves a lot of knowledge about electronics, so I can’t say anything. Now I don’t even understand macroscopic electricity. He is talking nonsense.

Li Xi stood aside listening with a dazed expression on his face. After looking around, he found that everyone was at a loss, so he was relieved.

He said, "Even if it's electricity... then what's the use?"

What is the use?That's pretty good proof, does lighting a light bulb count?

It's just that the matter was rushed, and he hadn't had time to get the light bulb, so he had to say: "Tomorrow in the Gewu class, I will show you what electricity is good for. It's getting late today, and if you drag it on, you may not be able to catch up with the curfew. You should go back first." Bar."

After all, Langhuan Academy is on the outskirts of the city, so if they don't leave now, I'm afraid they will be a problem whether they can make it to the city, not to mention whether they can catch up with the curfew.

All the students were immersed in the state of frantic study, but now Li Tan reminded them that it was getting late, they were shocked, and after saying goodbye to Li Tan, they prepared to leave in twos and threes.

Only Tian Shengong and Li Xi were left behind by him.

Li Xi looked at Li Tan vigilantly and said, "What are you trying to lie to me about?"

Li Tan looked at him rather amusedly and said: "The experiments are all finished, why should I lie to you, I just want to tell you that fighting is strictly prohibited inside the academy, and Tian Shengong is a student of the academy, so there is no need to say goodbye Yes, just punish according to the regulations?"

Tian Shengong was not unconvinced, and replied honestly: "Yes."

Li Tan continued: "It's you...how did you get in here?"

Li Xi hesitated for a moment and seemed unwilling to say it, so Li Tan said, "You'd better not lie, the people in the academy have eyes, who do you think you can fool?"

Li Xi had no choice but to say: "Sun Lu brought me here."

Sun Lu?Li Tan turned his head to look at He Zhizhang who was at the side.

He Zhizhang: ... What do you see me doing?I don't know all the students in the academy, at least there are hundreds of students!

He Zhizhang had no choice but to get someone to investigate, but Li Xi gave up and said, "There is no need to investigate, he is... my aunt's brother's son."

Li Tan was stunned for a moment, and then he remembered that Li Xi's biological mother was from Sun Gong, and this Sun Lu should be Li Xi's cousin strictly speaking.

Li Tan turned his head to look at He Zhizhang and said, "The access control will be stricter in the future. Visitors can be released depending on the situation, and they must register!"

He Zhizhang also nodded, this matter is indeed more important, you can't let people in casually, right?

Li Tan turned his head to look at Li Xi's sullen look and said, "You are not a student of my academy, so I won't punish you, let Da Lang do it."

Li Department: ...

How about punishing him according to the rules and regulations of the academy, he also read it, the fight is nothing more than copying books or something, how can he be fine if he falls into Li Chu's hands?

Forget it, if Prince Li Heng finds out...

Li Xi's complexion suddenly turned ashen.

Seeing that he was afraid of becoming like this, Li Tan was still wondering, is Li Chu so majestic?At first he thought it was pretty good.

Li Tan took Li Xi all the way back to Chang'an, went directly to Si Lou and handed him over to Li Chu.

When Li Chu saw the two of them, he was still a little strange: "How did you two get together?"

Li Tan explained the matter again, and Li Chu gave Li Xi a cold look and said, "It's good, the fights all went to Langhuan Academy."

Li Xi... bowed his head and pretended to be dead.

Li Tan waved his hand and said, "It's not a big deal, but how is the progress on your side?"

Li Chu sighed and said, "What else can I do? The progress can't be as fast as I want."

Li Tan was a little surprised: "What's going on?"

Li Chu said with a wry smile: "It's not the Ministry of Household Affairs. It's not fun to allocate money at first. Recently, there has been a war, and they have even more reason. Even saints can't force their heads to give money. We have to hold off."

Li Tan frowned, and Li Chu immediately said: "You don't need to worry about this matter anymore. What the Ministry of Finance said is also reasonable. Anyway, it's okay to postpone the project. It's a big deal in the second half of the year. Try to get this building built before the Chinese New Year." Get up."

Li Tan thought that there was no way to deal with this matter, so he could only sigh and said, "That's the only way, that's fine, I'll leave it to you, and I'll go back first?"

He has to go back to study the light bulb, oh, no, it's assembly.

There is no need for research. There are so many documents at hand, how can he use them for research?

The only thing to worry about is the raw materials, because he found that even the mall doesn't have everything, except for the original game mall, there is nothing left that surpasses the development of this era.

Even the previous armor was bought by him from the system, and then he refined the metal and reforged it.

But if you think about it, if you really have everything, if he just builds a generator, then Datang can directly enter the modern society.

Li Tan was thinking about what was available, and at the same time, he was picking a replacement for the filament from the mall.

Tungsten is now called heavy stone. He has no research on where it is used. He only knows that tungsten wire does not exist, and it is not particularly easy to make tungsten wire, at least overnight.

Fortunately, there are other alternatives, that is, carbon filaments, but the lifespan of carbon filaments is too short. After Li Tan estimated the time, it would take only one cup of tea at a time.

If you want to make the carbon filament bright longer, you must improve it.

Li Tan will not improve. He came up with this thing just to stimulate students' enthusiasm for learning. In fact, it is not very appropriate to have something like electricity now. In case there is an Anshi Rebellion Well, he's going to make a wedding dress for someone if he can't say it.

As for the students to do research, you must know that the battery has come a long way from scratch, or from a simple battery stack to a finished battery.

What Li Tan produced was the most primitive version, so if you want to completely produce a working light bulb, you must solve the power supply problem together.

Without the right direction, he didn't feel that these students could produce much research results in a short period of time.

Early in the morning of the second day, when Li Tan arrived at the academy, he once again found that the classroom was full of people. This time, it wasn't that some big boss came over, but that other classes came to gain knowledge.

The current teaching method of the academy basically follows the model of Guozixue plus later generations of universities. The course of Gewu is an elective, and there are very few people who can focus on this. After all, everyone still hopes to take a more orthodox imperial examination path.

So usually there are at most five or 60 people who come to class. Today... the whole classroom is full, and even the open space is full of students sitting on the ground.

Li Tan looked full of black lines, you people, don't you want the image of a scholar?Just sit on the ground like this?If this group of old gentlemen from the Imperial College saw this, I'm afraid they will criticize you again!

Regarding this, Tian Shengong said calmly: "Anyway, here are all scholars, and scholars have no image in front of knowledge."

Only then did Li Tan understand that the feelings here are all his own, and he doesn't need to maintain their image in the hearts of the people, so he doesn't care.

Li Tan was a little dumbfounded. He looked at Tian Shengong and asked, "Why are you here? I remember you didn't take the course of Gewu."

Tian Shengong scratched his head and said: "I didn't choose it because I haven't touched it before. This...is too profound, and I don't understand it. I saw the...thing called an experiment made by the head of the mountain yesterday, and I thought it was quite interesting. "

Li Tan was extremely nervous for a moment, he wouldn't fool a good general into becoming a physicist, would he?Wouldn't that be a sin?

Just when he was thinking about asking Tian Shengong whether he was interested in the art of war, Tian Shengong said: "I just feel that if this subject is learned well, it may be able to improve our existing weapons."

Only then did Li Tan breathe a sigh of relief. Fortunately, Tian Shengong didn't want to be a physicist yet.

It's just that when someone came, he couldn't drive Tian Shengong away, so he said: "Forget it, you can find a place to sit casually first."

Although there were many students, Li Tan found that he was not nervous at all, or he had been tempered, and he gave lectures calmly.

When the class was about to end, Li Tan finished the content of this class and said: "Last night, I did a small experiment in the Pavilion of Truth, which proved that besides the sky, our world also has electricity. At that time, someone asked What if I know? What is the use of electricity?"

He paused here, and found that the enthusiasm of the students had been mobilized before he said: "Actually, this question is very good. When we discover any new thing, it is best to keep such doubts. What is it? What is the use of it? It just so happens that I actually discovered some kind of effect during my previous research, and I will show it to you today."

While talking, Li Tan asked Bakun to bring up the battery pack he had prepared.

Yes, the battery pack, or multiple battery reactors, is as simple as it is anyway, and Li Tan finds it terribly ugly when he looks at it.

However, these students don't know what the battery will look like in the future. This battery pack consisting of four or five battery reactors is already very new to them.

Li Tan put on special insulating gloves, took out a transparent ball the size of a lychee and said, "This thing, I call it an electric lamp, well, as the name suggests, it is a lamp that is lit by electricity. The appearance of the lamp is made of crystal. Inside is a section of carbon wire, very simple, now we connect it to these two copper wires and see the result."

After Li Tan finished speaking, he signaled Bakun to put down all the windows and curtains in the classroom. Although the classroom was not completely dark, the light was also dim.

Everyone's eyes widened. They knew that thunder and lightning had light, but no one could understand why electricity could light up the lamp. Moreover, there was no oil or wick in the lamp, only a piece of carbon filament, and even There is no wax, how to light it?

Just when everyone was wondering, they saw Li Tan operating a little bit to connect the thing called the electric light with the copper wire.

And then... that small sphere emitted a faint light.

Although the light was very small, it was extremely bright in the dimly lit classroom.

The students were unanimously surprised, and Li Tan put down the lamp and said, "Look, this is an electric lamp. If it is enlarged, it will be brighter than it is now, but it will consume more electricity. , then you need a more powerful battery pack.”

After Li Tan finished speaking, he asked all the students to observe from left to right one by one. Of course, they can only observe but not get started.

Because the structure of this battery pack is too simple, the place where the battery is connected is also very simple, and there is not even a decent insulator.

Li Tan is not sure whether the electricity in this battery pack will electrocute people, but to be on the safe side, let them have a look.

After everyone had seen it, Li Tan saw yearning on their faces, and someone even asked: "Shan Zhang, does this mean that we can use electric lamps instead of oil lamps in the future?"

Li Tan replied earnestly: "Yes, but not now. You have also seen that the light of this electric lamp is very weak, not as good as an oil lamp, and its service life is very short. The most important thing is that electricity is still very dangerous. Look at me. I always wear gloves when working on this battery stack, because there are special things in the gloves that can block the conduction of electricity to me, and unless these problems can be solved one day, it is possible to use electric lights."

Immediately, a student said with a smile: "The head of the mountain has already been researched, so let's work hard to improve it, maybe we can use electric lights in the future."

Li Tan did not dampen their enthusiasm. In fact, even if all the problems he mentioned could be solved, there was still one thing that could not be solved in a short time-that was the high cost.

The lampshades of electric lamps must be transparent, at least at this stage, but glass has not been popularized yet, or there are too few raw materials suitable for making glass in the Central Plains, so it is not as good as some regions in terms of only glass.

Then without glass, we can only use crystal or colored glaze, neither of which is cheap.

That's not something ordinary people can afford!

However, we still have to work hard. Seeing that the weather is getting hotter and hotter, although Li Tan's quality of life is very high, and there is an unlimited supply of ice, how can it compare to the comfort of air conditioning?

I wish he could see air conditioning come out someday.

Seeing all the students discussing this issue very excitedly, Li Tan was also very relieved, but no matter how relieved he was, he had no plans to work overtime, and he still had to dismiss the get out of class.

But the moment he walked out of the classroom, he suddenly heard someone shout: "Thunder and lightning are powers that can only be mastered by the gods, and those who rebel against the gods will be punished!"

When he heard these words, he instantly had a bad premonition, and his body thought first and took a step aside to hide, but even so, he couldn't hide from the sharp blade behind him.