readx;?“ In fact, the charge can neither be created nor destroyed, it can only be transferred from one object to another, or from one part of the object to another, and in the process of transfer, the total number of charges of the system remains the same. Pen @ fun @ pavilion wWw. ｂｉｑUｇE。 Info charge, also known as electricity, has the physical properties of matter. It cannot exist without electrons and protons. The essence of making an object charged is the process of gaining or losing electrons. The essence of electricity is to separate the positive and negative charges, so that the charge is transferred, the essence is the transfer of electrons, not the creation of charges, we also let the electrons be transferred. Ye Xiaoyu said very professionally.

Listening to Ye Xiaoyu's words, Li Yun thought for a while, and then said: "The amount of charge is called the amount of charge, that is, the amount of electricity carried by the atoms or electrons of matter, according to the directionality of the electric field force, the charge can be divided into positive charge and negative charge, the electron has negative charge, and the proton has a positive point, what we have to do now is how to make the electrons and protons in our cicada wing material unbalanced, electron transfer, this is the key, we all know that the glass rod rubbed with silk has a positive charge, The rubber rods rubbed with fur have a negative charge, and as long as I find a way to make the electrons move, the violent movement will achieve my goal, and then this point is up to the martial arts master itself. ”

Listening to Li Yun's words, Xuan Nian thought for a while, and then said: "Yun Shao means that there is an electric charge in the cicada wing material itself, but the number of electrons and protons is in a state of equilibrium, and it does not show the essence of being charged. ”

Li Yunnian smiled slightly, and then said, "That's right, but I don't know if there will be high pressure." ”

Although Ye Xiaoyu sounded a little ambiguous, Ye Xiaoyu groped and knew that the so-called martial arts might be some kind of substance that the cicada wing guard armor wanted to defend against.

"In fact, even if the electricity generated by sitting in the matter itself is not high-voltage electricity, high-voltage electricity is to be converted, and energy is conserved, so it will not produce 1500V high-voltage direct current for no reason." Ye Xiaoyu said.

"Xiaoyu is not wrong, what we are talking about is within the range of generating electricity, as for the high-voltage electricity, it still needs to be converted, just like the high-voltage tester is converted by the transformer, from 220V to 10000V or even higher voltage, so here we need a DC transformer, when this DC transformer must be very small, attached to the cicada wing guard itself." Li Yun said.

"According to Yun Shao, a transformer should be considered when making the Cicada Wing Guard Armor." Dian Kang said.

Xiang Ben Xuannian and Deng Zixuan were a little puzzled, Xiang Ben said: "Yun Shao, do you really want to install a DC transformer in the cicada wing guard?" Is this possible? ”

Li Yun thought for a while and said carefully: "Although the current technology can synthesize cicada wing materials, it is still difficult to make a DC transformer attached to the armor according to the current driving. Generally speaking, a transformer has two sets of coils, a primary coil and a secondary coil. The secondary coil is outside the primary coil, when the primary coil is connected to direct current, the transformer core generates an alternating magnetic field, and the secondary coil generates an induced electromotive force, and the turns ratio of the transformer coil is equal to the voltage ratio. For example, the primary coil is 50 turns, the secondary coil is 5000 turns, the primary is 10V direct current, and the secondary voltage is 1000V. A primary coil with a smaller number of coils than a secondary coil is a step-up transformer, which can ramp a low voltage into a high voltage. Even if the electrons of the cicada wing material move, the transformer is ineffective. ”

Hearing Li Yun say this, everyone was a little depressed, but only Ye Xiaoyu had a smile on his face.

The other Xiaoyu said: "Xiaoyu, why are you still laughing? Do you think Yun Shao is telling a joke? ”

Li Yun Xiaoyu, Xiaoyu knew what the reason was, Li Yun was very pleased, and it was not in vain that he took great pains to invite Ye Xiaoyu back.

"Xiaoyu, someone doubts your smile, why don't you explain!" Li Yun said to Ye Xiaoyu.

Xiang Ben and Dian Kang are both looking forward to Xiaoyu, although the two are top students majoring in electronics, but now in the face of a bit of physical knowledge, the two are also hot-headed, and they can't think of anything north and south.

"Actually, Yun Shao has already mentioned this question just now, but we missed it when we listened." Ye Xiaoyu felt that Li Yun was not an ordinary person, and these people he came into contact with seemed to admire Li Yun very much, and he was still employed by others, so it was not an exaggeration to call Yun Shao.

"I mentioned it, where, what is it?" Deng Zixuan asked curiously, as if she had broken herself.

The ship is not far away from hating the ghost gang after the cruel cold

Ye Xiaoyu smiled and said: "It's the sentence that the glass rod rubbed with silk has a positive charge, and the rubber rod rubbed with fur has a negative charge. ”

"What, isn't it! Is that all? Triboelectric electricity, is it that simple? Impossible. Deng Zixuan said.

"Yes! How can it be so simple, absolutely impossible. Dian Kang said.

"It's that simple, it's just that we want to be complicated. We are all familiar with the phenomenon of triboelectric activation, but in fact, very few people really pay attention to how high the voltage will be generated by triboelectric charging, and I don't think anyone here has thought about it, except for the few clouds, of course. Ye Xiaoyu said.

"So how high is the voltage that can be generated by triboelectricity?" Deng Zixuan said.

"In dry weather, when we rub the plastic rod with fur, it will make a crackling sound, and in the dry weather night, we take off the sweater, the sweater rubs against the hair, and we will also hear this crackling sound, when there is no light, you may still have small sparks, you know, this small spark and crackling sound, but it is equivalent to close thunder and lightning, the breakdown electric field of dry air is about 300,000 volts / cm, that is, friction electricity will produce a high voltage." Ye Xiaoyu said.

After listening to Ye Xiaoyu's words, everyone else touched the cotton plush clothes they were wearing, and it was indeed like this, but they didn't expect that the small spark, and the crackling voltage, would have such a voltage.

"It's kind of unbelievable, it's unbelievable! With such a large voltage, why don't we feel like we are being sucked away by high-voltage electricity? Xiang Ben was also a little incomprehensible and said.

At this time, Li Yun said: "Ye Xiaoyu is not alarmist, what he said is indeed true. For example, if a small ball with a diameter of one centimeter, then the surface area of the ball is about 3 cubic centimeters, and the diameter of an atom is about one billionth of a centimeter, which is about the minus eighth power of ten, and the area occupied by an atom above the surface area of the ball is ten to the minus sixteenth square centimeter, and the surface area of this small sphere is about three times ten to the sixteenth power of atoms, that is, 300 million billion atoms.

In the friction process, every 10,000 atoms on the surface area of the sphere gain an average of one electron, so a total of three times ten to the twelfth power of electrons is obtained, and the amount of charge of each electron is 1.6 times 10 to the minus 19th coulomb, and a total of 0.5 μC of negative charge is obtained.

The knot is observant from afar, and he hates it coldly

That is to say, when a small ball with a diameter of one centimeter has a uniform charge of 0.5 μC in its surface area, the electric potential on the surface of the charged ball is u=kq/r, and it is determined by the experiment that k is equal to nine times ten to the ninth power vm/c. The electric potential u is equal to nine times ten to the ninth power vm/c multiplied by zero point five times ten to the negative sixth power c divided by zero point five times ten negative power m and finally equal to nine times ten to the fifth power, that is, 900,000 volts, isn't this still high voltage? ”

Hearing Li Yun say very professionally, they were all very convinced, but Xuan Nian asked: "Yun Shao, just like Violet asked just now, why can we generate a voltage of almost 900,000 volts, but we don't feel the slightest feeling, that is, small sparks, and a faint crackling pain." ”

"Although triboelectric can produce a high high voltage electricity, because the amount of charge is very small, it generally does not cause a large continuous current, so we will not feel any disconnection, but if there is a continuous current, the effect will be different." Li Yun said.

"According to Yun Shao's meaning, we have the innate conditions to generate high-voltage electricity but not the conditions to be able to generate continuous current, as long as there is continuous current, our armor will be considered successful, does that mean?" Dian Kang said.

"That's right, that's what it means." Li Yun said.