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Liu Fang's original intention of joining the organization was to consult some questions that he was not very clear about, and after hearing Sam's all-encompassing words, he couldn't suppress his inner curiosity and asked such a question: "Okay, let me first ask the first question - in essence, human communication is basically completed through electromagnetic waves, and in the process of current transmission, electromagnetic fields will also be formed, that is, electromagnetic wave signals, in this case, can we complete signal transmission through current?" ”

Sam was immediately stunned when he heard this question, and paused before he spoke: "Do you mean that signals are transmitted through electromagnetic fields formed by electric currents?" ”

"Yes, the current needs wires to transmit, the wires are equivalent to a complete signal transmission track, as long as this problem can be solved, we don't need to install telephone lines in the future, because every household has wires accessible, and it is completely possible to use wires to transmit signals, isn't this a big cost savings?"

"Well, theoretically speaking, this problem is indeed feasible, but in practice, there are still many obstacles."

"I don't know what the obstacle is?"

"This ...... This ......"

Sam hadn't thought deeply about this question, and now he was asked by Liu Fang, he didn't know how to answer, and in desperation, Sam could only cast a look at Professor Callem for help.

Seeing this, Professor Callem stood up, and he smiled and nodded: "What an interesting person, and the questions raised are also very thoughtful. ”

Professor Callem walked up to Sam and took the microphone in his hand: "Poor boy, the idea you put forward has actually been applied as early as the twenties of this century, as you said, the use of power lines for signal transmission can indeed save the cost of laying communication pipelines, but there are some big problems in this technology, such as the stability of signal transmission, and the safety of power use, because if you want to transmit signals through power lines, you need rated voltage to maintain a fixed electromagnetic wave frequency, Only the high-voltage line has this function, and the general household voltage does not have this condition, in addition to need to be equipped with special mediation equipment, in order to demodulate and restore the signal, in general, the main limitation is still from the hardware technology, the existing hardware technology is not enough to support the large-scale application of this concept. ”

Liu Fang only studied high school courses by himself, whether it is knowledge or overall view, can not be compared with the world-renowned Massachusetts Institute of Technology professors, after listening to Professor Callem's explanation, Liu Fang suddenly had a feeling of surprise: "Thank you for your explanation, I have understood, the next question - in essence, the transmission of electricity is actually the movement of energy, and the principle of electromagnetic field and electromagnetic wave is basically the same, in this case, can power transmission be carried out without passing through wires?" ”

This question belongs to the category of energy physics, which is somewhat different from the direction of Professor Callem's research, he focuses on physical information engineering, and is not very good at energy physics.

Sam and the others all showed incredible looks when they saw their teacher being asked, you must know that Kalem is a senior professor at the Massachusetts Institute of Technology, and he has been famous for many years.

In order to alleviate the professor's embarrassment, Sam hurriedly rummaged through the nearby bookshelves, and soon found a book on energy physics from the shelf.

Sam looked at it at a very fast speed, but Liu Fang didn't hear the answer, so he said strangely: "Hey, are you still there?" Is the signal too bad that you can't hear clearly? ”

Sam took the microphone from Professor Callem's hand, and while flipping through the book, he pretended to feed twice: "I encountered clutter just now, and the signal on our side is not very good, can you please repeat the problem?" ”

Liu Fang did not doubt him, and repeated the question according to Sam's words, Sam took this opportunity to find the answer, he laughed, and said in a mocking tone: "Poor boy, the question you raised is very deep, if it weren't for my extensive knowledge, I'm afraid it would be difficult to answer, to tell you the truth, as early as the nineties of the last century, there was a scientist named Tesla, who applied for a similar patented technology, unfortunately, this technology is also because of technical defects, can not be effectively applied in practice." ”

Sam began to read according to what he had found: "The biggest obstacle is that electromagnetic waves are only suitable for transmitting signals, not for transmitting energy, because the directivity of electromagnetic waves is very poor, just like the electromagnetic wave signals we are making now, and the electromagnetic waves we emit to each other are scattered, and they may send out ten units of electromagnetic wave signals, and the other party can only receive one of them." ”

"This is not too much of a problem in terms of communication, but once it comes to energy transmission, then the problem is very serious, first of all, the energy lost in the transmission process is too huge, from a practical point of view, it is very uneconomical, if a power company really uses this power transmission method, it will definitely go bankrupt very quickly."

"Secondly, the biggest difference between electrical energy and electromagnetic signals is that electrical energy is extremely dangerous, it can kill people very easily, but electromagnetic waves are different, if you want to raise electromagnetic waves to the level of being able to kill people, the intensity required is very high, and it is basically impossible to achieve this intensity in reality, and only in the laboratory, can you create such high-intensity electromagnetic waves, do you understand what I said?"

After listening to Sam's explanation, Liu Fang couldn't help but think: This organization is really powerful, and any person can explain the problem so thoroughly, well, if you stay here in the future, you will definitely be able to learn a lot.

Liu Fang nodded seriously when he thought of this: "Thank you, Your Excellency, your words have given me a deeper understanding of electromagnetic waves, and I have a feeling of being sudden." ”

Sam thought to himself: The question raised by this guy is so profound, it must not be an ordinary person, such a powerful person, can he communicate with us? Whatever, just join in anyway, so that the association can be maintained.

Next, Liu Fang kept asking questions, compared with the previous two questions, the questions he asked were not too difficult, mainly involving hardware.

Sam and others are mainly focusing on this direction, and they have a certain level of attainment in these questions, and they can answer them without any brain cells.

Liu Fang felt that he had really found the right place, and he was even more determined to stay in the association.