Short video spoiler history: The beginning of modern warfare

Chapter 63 Principles of Power Generation
During the Hongwu period, Jinling City.

“Fertilizers and improved seeds.”

What was said in the comments section is basically correct, and both mentioned the importance of fertilizers.

When it comes to fertilizers, Zhu Yuanzhang was extremely concerned about it. A few months ago, after learning from Tianmu about the production of three types of local fertilizers, namely, local ammonia fertilizer, local sulfur fertilizer, and local nitrogen-phosphorus compound fertilizer, he specially allocated 117 acres of land for experiments.

In order to ensure the reliability of the results, the fertilization, irrigation and other conditions of these allocated farms were kept consistent with those of other farms. Servants were simply assigned to look after them and apply the corresponding fertilizers at appropriate times.

Since Tianmu only mentioned the production process, when it came to fertilization, the amount of fertilizer and the timing of fertilization became problems. The timing of fertilization was easy to say, but the amount of fertilizer could only be tried a little bit at a time. In addition, the amount of fertilizer applied and the subsequent growth of rice must be strictly recorded each time fertilization was applied.

It can be said that the imperial court has now gradually understood the approximate range of application amounts per acre of land.

After several long months, we finally see a glimmer of hope. The rice in these fields is growing much better than that in ordinary fields. The rice ears are so heavy that they bend the stalks, and the grains are full.

The output is expected to increase by more than 30% compared to ordinary farmland.

This is an exaggerated number, but it is indeed the case, which is why Zhu Yuanzhang attached so much importance to the sky curtain.

Of course, the premise is that I don’t know how many times the grain yield per mu has increased in the past 60 years. Now that I know, I think it’s okay.
However, even though he was embarrassed to brag about it, Zhu Yuanzhang still felt a little regretful in his heart. How much less grain would be harvested this autumn.

Finally, after thinking about it, I can only say that it is Tianmu's fault. Don't talk about such an important thing so lightly.
Just like the steam engine, the end of science is boiling water, etc.
What does boiling water have to do with science?
Another example is honeycomb briquettes.

Although it sounds simple, it doesn't look difficult, and it's actually very easy to operate, but who knew that this thing had to be mixed with yellow mud and water, like kneading dough? Zhu Yuanzhang seriously suspected that the person who invented honeycomb coal was a profiteer.
In addition to the application of chemical fertilizers in some experimental fields in Zhuangtian, later with the various magical skills taught by Tianmu, many people gradually became convinced by Tianmu, so a small amount of corresponding ammonia, sulfur, nitrogen and phosphorus fertilizers were applied to some fields with poor growth according to the situation, and the situation improved accordingly.

Therefore, everyone from the imperial court to the public finally felt relieved, and the "technology" mentioned by the sky curtain a few months ago is now slowly being accepted and used.

During the Zhenguan period, Chang'an City.

Li Shimin was also a little confused when he looked at the comment section. He had only known from Tianmu that fertilizer could increase production in a short period of time, but he did not expect its importance to be so high.

He exchanged a glance with Fang Xuanling and the others, secretly feeling lucky. Fortunately, they had no prejudice at the time. Although they had some concerns about the theory of the sky curtain, they still marked out part of the imperial land for experimentation with the mentality of giving it a try. The specific measures were basically the same as those during the Hongwu period.

But I feel a little ashamed to say that I have been so busy in the past month that I almost forgot about this matter.
"I remember that a long time ago, the sky curtain taught several methods of making fertilizers. What were they?" The civil and military officials below began to whisper, because each time the sky curtain lit up for at least 2 hours and at most 3-4 hours, and the videos involved were extremely numerous and complicated, so no one could remember so much content.

In the beginning, some people in the private sector also took notes, but they gave up later because there was too much content. Just sitting there to read it would make your neck sore and your head swollen, not to mention having to take notes while reading, which was simply torture.

"Alas, I forgot too."

"What should I do then?"

"How about you go and ask His Majesty to look through the old files?"

"Why don't you go?"

Li Shimin didn't hear it clearly, but he could guess what was going on.

Every household in the imperial court, civil and military officials, has plenty of fertile land, so even if grain production increases by only 10%, it is a real benefit, and it is a long-term benefit.

At this moment, I had a slight thought in my mind. If I could compile the magical knowledge taught by Tianmu into a book every month and publish it at a low price.
As soon as this idea came into being, it occupied Li Shimin's mind crazily. It was similar to the breeding efforts of the whole country in later generations.

Li Shimin certainly did not think that the development and exploration of science could be supported by the officials of the court. He just had not thought of a better way before. Now this method has brought in local gentry and many poor families.

Now that all regions have tasted the convenience and benefits brought by the development of science and technology, they are naturally motivated to do these things. Moreover, unlike in the past, with the path pointed out by the sky, the exploration and improvement of scientific theories should be much simpler than in later generations.

Seeing the scene change again on the sky screen, Li Shimin had to temporarily interrupt his thoughts and record it down.

[We all know that human society has experienced three industrial revolutions, the most notable of which are the invention, improvement and application of steam engines, the invention and application of electricity, and the invention and application of computers.]

[These three waves of industrial revolutions, one higher than the other, brought mankind from agricultural society into the steam age, the electrical age, and the information age, each of which brought earth-shaking changes to human society.]

[Electricity is a product of the Second Industrial Revolution and is still in use today. Have you ever thought about where the electricity we use in our daily lives comes from?]

[In fact, this is all thanks to Michael Faraday, who we learned in junior high school physics. He discovered 200 years ago that if you move a wire in a magnetic field, the wire will induce an electric current.]

[Faraday later summarized this discovery and proposed the law of electromagnetic induction.]

[Make a coil of wire and put it into a magnetic field to rotate, and electric current is generated.]

During the Zhenguan period, Chang'an City.

At first, Li Shimin thought that Tianmu was talking about the changes brought about by various industrial revolutions, but he didn't expect Tianmu to change the subject and introduce the principles of electricity.

Um? ?

In order to make it easier to understand, Tianmu also made a corresponding painting demonstration, which was a coil rotating between two block-shaped objects on the left and right.

"Is this electricity?" Fang Xuanling and others exclaimed in horror.

Li Shimin's face changed drastically. To be precise, is this the principle of power generation?

But this is the product of the Second Industrial Revolution. We haven't mastered the steam engine yet.
Li Shimin's expression changed several times. He didn't know whether the first and second industrial revolutions had a relationship of inheritance, but now huge wealth was right in front of him.

There might not be another store like this after this one, so after the shock, I firmly shouted, "Copy!"

This was almost shouted out, and all the civil officials, military officers and clerks reacted. Without caring about words, they hurriedly copied down what Tianmu said. The painters also carefully copied the scenes demonstrated by Tianmu.

Li Shimin's forehead was covered with sweat, and he also started to copy it himself, but his handwriting was crooked.

The thing in the sky dome is divided into three parts. The red block on the left has N written on it, and the blue block on the right has S written on it. According to what the sky dome said about the magnetic field, could this thing be a magnet?
The middle one is the simplest coil, you can understand it at a glance.

It's that simple?
During the Hongwu period, Jinling City.

Zhu Biao recognized the object displayed on the skylight at a glance. It was an electric fan.

However, before he could tell us his discovery, Tianmu suddenly changed the subject and introduced the principle of power generation. ! !
"Is this thing a common thing? How come people in later generations start learning it in junior high school?" Hu Weiyong caught some insignificant information and felt very upset.

In fact, many things in later times are very different from today, such as boys and girls going to school together. In the past, there were many knowledgeable people in the comment section, but they were bored and cursed at each other by quoting classics.
As far as Hu Weiyong knew, the school system in later generations was small, middle and big, that is, primary school, middle school and university, among which middle school might be further subdivided.

He was not sure how many years each course lasted, but he guessed that later generations invested a lot in education, so all the unusual phenomena could be explained, such as why so many learned people were too idle to argue and confront each other in the comment section, and many methods that seem shocking today were common in later generations.

For example, artificial rainfall is not as popular as the panda named Lan.
At least he had never seen any video that had received so many "red hearts" clicked on it so "unhesitatingly".

Thoughts were racing in his mind, but the pen in his hand did not slow down. Hu Weiyong only picked out the important parts to record, so he could still think about other things. He was able to do it with ease.

The left and right sides should be magnets? What do N and S stand for?

Zhu Yuanzhang got the principle of power generation, but after being delighted, he felt a little confused.
This stuff is important like oil, but.
I don't seem to know how to use it.
孽 孽!
[If you connect the two ends of the coil directly to the wires, the wires will get tangled when the coil rotates.]

[Engineers installed brushes and slip rings on the coils. The current generated by the rotation of the coils can flow to the wires through the slip rings and brushes, thus solving the problem of wire entanglement.]

[Connect this wire to the brushes at both ends to form a circuit]

[Every time the coil rotates half a turn, the circuit will be reversed due to the change in the magnetic field. If the current has color, then the light bulb connected to the wire will change color every half a turn]

[The current generated by this generator is also called alternating current, which has more advantages than direct current in long-distance transmission]

[It can also easily change the voltage through a transformer to adapt to a variety of electrical appliances and industrial equipment, so the electricity we use at home is AC, and this generator is also called an AC generator]

The latter part talks about some small details of power generation, and the explanation is accompanied by corresponding explanatory paintings, so even Zhu Biao and a group of civil servants can understand it.

"That's brilliant! Make the extended part of the rotating copper coil into a circular slip ring, and add a brush at both ends of the wire so that they are in contact instead of connected together, which can prevent the wires from getting tangled."

This part was extremely simple, so the painters and craftsmen understood it immediately.

"Alternating current and direct current?" Zhu Yuanzhang could not fully understand the difference and could only remember it according to what Tianmu said.

"So that bright thing is called a light bulb! So it runs on electricity!" Zhu Biao used the word "so" twice in a row. After all, he had seen the night view from the sky many times, and the light was dazzling even from a distance.

In the skylight, the school at night also uses this light bulb. Those school night scenes are always remembered in my mind.

Of course, there is also the electric fan that he has been thinking about.

Zhu Biao trembled slightly. He could clearly feel that the electrical age was about to arrive.

Perhaps, this speed is much faster than many people imagine.

Hexing Tea and Snack Shop.

The diners, the shopkeeper and the servants were all very excited, it was electric!!!
That is the most violent force in the world!

"It turns out that later generations did not tame thunder and lightning, but created them out of nothing!" Mr. Su pinched his thigh under the table. Well, it hurt.

This is more terrifying, okay?
Creation is harder than taming, it's creating something out of nothing!!!

He took a long breath and pinched himself again. Hmm, it still hurt. It wasn't a dream!

He didn't know how many times he had pinched his thigh today, and his thigh was probably bruised by now.

"This thing is called a light bulb!" The waiter put the rag on his shoulder, looked at the sky and murmured, it turned out that they were powered by electricity.

The waiter carefully recalled the busy scene, the endless vehicles passing by, and the things lit on the roadside. At that time, he thought it was a special lantern. He also lamented how much oil it would take every day, how many people would be hired to light it, and how high the lanterns were hung.
The waiter's face turned red, but when you looked closely, no one noticed.

Fortunately, I haven't told anyone about this.
[The stability of direct current is better than that of alternating current, especially in some fields that require high-precision electric equipment]

[At this time, a DC generator is needed. Its principle is also based on the law of electromagnetic induction, but the direction of the current must remain unchanged.]

[We already know that on the AC generator, every half turn of the coil will cause the circuit to reverse due to the change in the magnetic field]

[In order to keep the current flowing in the same direction, a commutator needs to be installed between the two brushes]

[This commutator is a ring split in the middle with a gap in the middle. It can automatically change the brush contact point when the magnetic field of the coil changes, so that the circuit always maintains the same direction. This is the basic principle of the DC generator]

[Adding more turns increases the magnetic field produced by the coil rotor. You can also increase the torque of the electromagnet to achieve higher speed by winding more wire around the coil, thus completing the production of a generator]

[Of course, natural magnets are not suitable for power generation. The solution is simple: wrap the copper wire with a familiar magnet.]

[Then wrap these copper wires around the iron block according to the right-hand spiral law. When lightning strikes, the current in the copper coil will generate a strong magnetic field, which will magnetize the iron block in the coil, and the magnet will be ready.]

[Now that I understand this principle, my mother won't have to worry about me traveling through time anymore. But if I really travel through time, do you have the confidence to rebuild electrical civilization? ]

"So poor students should not even think about traveling through time [covering face]"

"Knowledge is power. This is not just a saying. It is a joke to rely on brute force to achieve development."

"When I first took the electricity and magnetism course, I was really confused. What is the connection between electricity and magnetism? How was the relationship between the two discovered? It's hard to imagine."

"I am ashamed. What was my Qing Dynasty doing at that time?"

"The Qing Dynasty also carried out reforms, but unfortunately they were unsuccessful."

You missed the transmission and transformation part

There Was No Such Thing in the Beginning

"My eyes understood it since middle school, but my hands never understood it"

(End of this chapter)