Compared with the first experiment, the second experiment is not complicated, what he wants to do is a simple hand-cranked generator. Belts, gears, crank handles, rotors made of natural magnets, and stators made of coils.

With Jiang Xingchen's hands-on ability, this simple hand-cranked generator was quickly completed, and Xian Ning and the others watched attentively, waiting for the miracle to appear again.

The lead wire was reconnected to the carbon wire, Jiang Xingchen turned the rocker, and the rotor spun rapidly in the center of the coil. Then the carbon filament was lit up again, and then it burned out!

"Can this also generate electricity?" asked Xian Ning in surprise. Jiang Xingchen said just now that the use of potatoes to generate electricity means that electrons are transferred from the negative electrode to the positive electrode to form an electric current. But the current experiment also generated an electric current, which has nothing to do with the loss of electrons gained.

Jiang Xingchen replied: "This phenomenon is called electromagnetic induction, and the induced current will be generated when the magnetic field lines are cut by a closed circuit...... You may not know about magnetic field lines, but you can't see them!"

Jiang Xingchen said, beckoning to the private soldier behind him, and the private soldier behind him immediately handed over a long magnet, a piece of cardboard, and a small cloth bag.

"Magnets can absorb iron, you should have heard Xian Ning say this!" Jiang Xingchen put the magnet on an iron frame casually, and snapped and sucked it.

The researchers nodded, they did already know this, and Xian Ning told them two days after the little pompom was brought back.

Jiang Xingchen smiled, put the magnet on the table, covered it with cardboard, and then opened the small cloth bag and put it on the cardboard.

"This is fine iron sand, you see!" Jiang Xingchen said and shook it slightly, spreading the iron sand evenly. Then flick it a few times.

"Oh~" Xian Ning and the researchers exclaimed again, and the iron sand spread on the cardboard turned into arcs. Very regular.

"See, this is the embodiment of magnetic field lines!" Jiang Xingchen said and then kept silent. Let them digest it well.

"Sir, it's this kind of invisible magnetic field line that can be cut by a closed wire that can generate an induced current, right?" asked the researcher who had just spoken.

"Yes!" Jiang Xingchen nodded and said, "Actually, not only magnetic energy can generate electricity, but electricity can also generate magnetism!"

Then he took out another piece of ordinary iron, wrapped it with a wire, and connected the two ends to the wire that came out of the potato battery.

After a while. Jiang Xingchen used this ordinary iron block to get close to the iron sand, and part of the iron sand was adsorbed on the iron block. Then he turned off the electricity again, and the iron sand fell off.

"It's really amazing!" Xian Ning let out a sigh, these two experiments today have touched her very much, this is completely a new energy, which will bring earth-shaking changes to the world. She couldn't help but think of the scene Jiang Xingchen had described, and her heart became hotter and hotter.

Next, Jiang Xingchen asked everyone to form a circle. Take out a pen and paper and start to explain some circuit knowledge, what is voltage, what is current, what is resistance. and the relationship between the three described by Ohm's law. What else is called series, what is parallel, and what are the characteristics.

If there were no previous two experiments. Jiang Xingchen explained these to them is tantamount to playing the piano to a cow, if they can understand it, it would be strange. But there is an experiment as a basis. Even if you can't figure it out, you can understand it a little bit.

Another full day. The sky was dark, and Jiang Xingchen stopped, and the immortals still had some unfinished feelings.

"What is there to study tomorrow, this is a university subject, and it can't be explained clearly in one sentence or two! I haven't eaten for a day, and it can't affect my body!" Jiang Xingchen stood up, he was really hungry, and his throat and eyes were about to smoke.

Jiang Xingchen said this, and the stomachs of a group of people immediately sounded a gurgling sound, all of them were in their twenties, of course they couldn't stand it without eating for so long.

"Let's eat early! But you can't eat the potatoes on the table!" Jiang Xingchen reminded that he had read the report in his previous life.

The researchers nodded again and again, and then said goodbye to Jiang Xingchen and left, talking about what Jiang Xingchen had just said as they walked.

After everyone left, Jiang Xingchen said to Xian Ning: "In the past two days, you can refine the disciplines, although thermodynamics, electricity, optics, and mechanics all belong to the category of physics, but it is better to study them separately!

"So fast?" Xian Ning frowned, the researchers still hadn't even figured out the basic theory.

Jiang Xingchen said: "The construction of the railway is very fast, and the invention of the telegraph is imminent! The construction of the new city is also nearing completion, and the application of electricity must also be done as soon as possible!"

"But the lighting device isn't there yet!" Xian Ning shook his head.

"I'll be involved in the next stage, and we'll work on it together! I'll start tomorrow on the lighting installation, and I'll work on the telegraph design at the same time...... By the way, the proofreading of the clock has been completed, and a batch can be produced first, and in the future, the time algorithm of our star will be based on the clock, and (the month time) is called the hour!"

Xian Ning shook his head and said, "Is this okay, can the tourists who come to our territory adapt?"

"It's okay, try it first! The clock is much more intuitive than the hourglass, and when the tourists get used to it, I will mention it to the emperor, and change the diary time, which is subject to ours!"

"Can the Great Emperor agree?" Xian Ning wondered.

"Let's talk about this later, if you don't agree, there is a way to disagree......" Jiang Xingchen smiled slightly, and turned back to the original topic: "In the future experiments on electricity, we must pay more attention to safety, the danger is very high!"

Xian Ning nodded: "I know, I knew when you asked Xiao Yong to try it just now...... But we're busy this time, telegraphs, lighting fixtures, electrical experiments, and clocks! Xingchen, why don't you find someone else to take over the management of the university!"

As soon as Jiang Xingchen heard about this, he turned his head and left: "Let's go back, let's eat first, I'm too hungry!"

"Hey!" Xian Ning stretched out his hand to grab Jiang Xingchen, but he didn't expect him to move quickly and trot out of the door of the laboratory.

"Hmph, so much work, how can I be so busy, I don't have time to study at all!" Xian Ning stomped his feet angrily.

At this time, Jiang Xingchen's voice came from outside again: "Xian Ning, don't forget to arrange a place for Xin'er and the old man, medicine should also be built in the university!"

Xian Ning puffed out her mouth angrily, and finally shook her head helplessly and left the laboratory......

After Jiang Xingchen returned to the Lord's Mansion, he casually took a bite of food, and immediately found Grandpa Fu and told him about his subsequent plan.

Grandpa Fu was dumbfounded after hearing this: "Prepare 10 billion citrine coins, what do you want to do, sir, to ask for so much money?" (to be continued......)

PS: It's finally finished!