At this stage, the first thing that Xingchen needs to study is the telegraph, and in order for the rapid development of the railway, there must be a communication tool that is not affected by the weather, has no time limit, and is faster than the railway. With the technology of Xingchenling at this stage, there is no doubt that the telegraph is the most suitable.

Jiang Xingchen was anxious to find magnets, not only for telegraphy and power generation, but also to establish the discipline of electricity first, especially the principle of electromagnetic induction. Only by letting everyone have an intuitive understanding will it be more conducive to their understanding, and it will have a huge impetus for the development of electric power in the future.

As for the telegraph, as long as the principle of electromagnetic induction is understood, all that remains is to find the right material to lay the line and invent the battery, and the most important one is coding.

Jiang Xingchen didn't know much about the Morse code commonly used in telegraphs in the previous life, and he didn't know the specific structure of telegrams, but as long as he knew the principle, it shouldn't take too long to study it. This time into the depths of the vast mountains, they used a simple flashlight to spread the message, and its practical use was a kind of code.

And the experiment that Jiang Xingchen wanted to do for Xian Ning was to show the effect of electricity and explain the principle of electromagnetic induction.

In fact, it is most convenient to explain the principle of electromagnetic induction through batteries, because battery research is not difficult, as long as you find the right metal, Xianning has a relatively complete summary of the activity of known metals through several years of experiments.

As for electrolytes, it's even simpler, and potatoes can be used instead...... However, for power generation, the use of batteries to make electromagnets is obviously far from enough, and now there is no enameled wire to do the winding, so he is so anxious to find a natural magnet, and the new city is about to be built. When the time comes, what will happen if there is no electricity?

Of course, in the future, when electricity has developed to a certain stage, electromagnets will still be used.

Xianning has been longing for electricity for a long time. Hearing Jiang Xingchen mention the experiment, he nodded happily: "Of course I remember." You're going to show me electricity, I've been waiting!"

"Okay, you arrange a few researchers and let them study with us. Jiang Xingchen nodded and commanded in a low voice.

After leaving the university, Jiang Xingchen did not return to the lord's mansion, but first went to the rubber production yard and asked to make a batch of wire insulation.

After more than three years of development, the rubber industry has become more mature. The craftsmen said they could study it in one night.

The next day, Jiang Xingchen came to the university early in the morning, and Xian Ning was already waiting with more than a dozen researchers.

The researchers' eyes were a little dark, but their spirits were very excited, and last night Xian Ning told them that they were about to participate in an epoch-making experimental research, and they didn't sleep much all night.

Jiang Xingchen was very satisfied with the people selected by Xian Ning, these researchers were full of vigor and longing for the unknown. In the future, I will definitely be able to become a backbone of scientific research projects.

Taking everyone to the laboratory, Jiang Xingchen took out a few wires, there was no copper, he used the yellow silver alloy of the empire to make copper coins. The outside has been covered with insulation, and it is the prototype that the craftsmen of the rubber factory have studied overnight.

Later, Jiang Xingchen asked the private soldiers to bring a few potatoes, all of which were steamed! He remembered that he had read an article about potato power generation in his previous life. It is said that the power generation performance is best when steamed to medium cooked.

The next thing is to choose metals, Xian Ning has already arranged dozens of metals in order according to their lively nature.

Jiang Xingchen directly chose two metals, iron and silver. Then a couple of potatoes were connected in series with wires and metal clips, and finally a very thin carbon filament was taken out......

In the process of Jiang Xingchen's preparation, everyone held their breath. Staring at his movements with wide eyes and unblinking, for fear of the slightest mistake.

At the moment when Jiang Xingchen clamped the two wires drawn out of the tandem potatoes at both ends of the carbon filament, the carbon filament emitted a bright light, as if it had been ignited.

"Oh~" Xian Ning and the researchers exclaimed in unison, their faces flushed with excitement.

After a few moments, the carbon filament burned through the middle, and the light suddenly disappeared. Xian Ning and the researchers still opened their mouths wide, and they didn't come back to their senses for a long time.

"Xingchen, this is also amazing, just use a few potatoes to set the carbon filaments on fire?" Xian Ning muttered.

"This is electricity!" Jiang Xingchen said with a smile: "If there is an electric current passing through the carbon filament, it will light up! In fact, you can feel it if you try it!"

Jiang Xingchen said and nodded to one of the researchers: "You stretch out your hand!"

"Oh!" the researcher held out his hand sneeringly.

Jiang Xingchen took out a few more potatoes and connected them together, and then put the two clips into his hand, and the researcher suddenly sighed and shook his hand vigorously.

"What's wrong?" the group hurriedly asked.

"It's like...... It looks like something has been bounced hard!" the researcher replied, looking up and seeing that nothing had changed, it was normal.

When everyone calmed down a little, Jiang Xingchen said: "This is a battery, converting chemical energy into electrical energy! In fact, this is a process of gaining and losing electrons......

Next, Jiang Xingchen roughly explained to them, but except for Xianning, they all seemed ignorant, when it came to the microscopic world, they hadn't been in contact with it, of course, they couldn't understand any words such as atomic nuclei and extranuclear electrons.

Jiang Xingchen was not in a hurry, he was just instilling such a concept in them now.

"Sir, what is electricity used for?" asked one of the researchers.

"As you all saw just now, you can light up the carbon filament with electricity! If the carbon filament burns continuously, can it continue to illuminate?" Jiang Xingchen said with a smile.

"Hmm!" the researchers nodded, all lost in thought.

"Xingchen, you said before that metal elements can be separated by electrolysis, is that this method?" asked Xian Ning.

Jiang Xingchen shook his head and said, "The electrolysis method is fine, but it is not necessary whether the power is enough or not, and I don't know very well, I need to do experiments!"

"Since you can generate electricity with potatoes, why are you going to the depths of the vastness to find magnets?" Xian Ning asked again.

"Hehe!" Jiang Xingchen chuckled and explained: "If you want to light up more carbon filaments, how can this little power be enough, even if you take out all the potatoes we plant, it will not be enough!, so you must use magnets...... And there are so many uses for permanent magnets!"

Xian Ning thought for a moment and asked, "How can you use magnets to generate electricity?"

Jiang Xingchen waved his hand and said, "Of course not, you will understand this experiment next, this is a very important phenomenon!"

The battery power generation was successful, and Jiang Xingchen was also quite confident in the electromagnetic induction experiment, and turned around and ordered the private soldiers to prepare the relevant materials. (To be continued......)

PS: I originally wanted to write 4,000, but it took a long time to check the information, and in the end I only wrote 2,000!

In addition, I have seen the part of the book with carbon filament lit on TV, but it is not a battery. Whether this current can light up the carbon filament is actually not clear about garlic, it is apocryphal, and it has not been tested, brothers, forgive me!