Rebirth 91, this time I want to be a doctor

Seeing Liu Xiaochuan come in, Guo Yunda said, "I'll fix this black and white TV first, and you can fix the 21-inch color TV."

Liu Xiaochuan nodded, went over to open the back cover of the color TV, and took a look. The problem was not serious and could be repaired.The owner of the color TV was waiting at the scene and asked Liu Xiaochuan: "Can it be repaired? How much will it cost?"

Liu Xiaochuan said: It can be repaired, but two capacitors need to be replaced.As for the repair costs? "

Before he could say anything, Guo Yunda rushed to say: "This needs to be replaced. It's quite troublesome. It will probably take several hours to repair, at least one hundred and fifty."

Liu Xiaochuan originally wanted eighty, but he didn't expect Guo Yunda to want so much. He thought this guy was really evil.

The man negotiated the price, and finally Guo Yunda offered a discounted price of one hundred and twenty, and asked the man to go back and do more publicity. The man gritted his teeth and agreed, one hundred and twenty, and half a month's salary was gone.But if we don’t repair it, it won’t work. A color TV costs more than 2000 yuan, which is a year’s salary less.There is basically no after-sales service for household appliances in this era. If they break, you can only find a repair shop.

Since he asked for a high price, he had to repair it for a while to make people feel more balanced. Liu Xiaochuan spent more than an hour tinkering with it before repairing it.

Seeing normal images appear on the TV again, the owner of the TV happily paid the money and went home with the color TV in his arms.

In 91, the TV penetration rate was already very high. Liu Xiaochuan remembered that when his grandfather was still alive, he bought a 88-inch Panda brand black and white TV in 17. Of course, this TV is now given to Liu Xiaochuan's second son. In my uncle's house, my grandpa has passed away, and my grandma has to go to her younger son's house to take care of herself.Liu Xiaochuan's own family originally bought a black-and-white TV set last year. Later, Liu Xiaochuan had an accident and had to pay compensation, so he gave it to someone else.

Nowadays, many families in rural areas have TVs, and they are basically popular in provincial cities. However, color TVs are still relatively scarce and are considered a big item in the home.

Guo Yunda spent a long time tinkering with the remaining black-and-white TV, but he still couldn't fix it. Finally, it was Liu Xiaochuan who found the problem and quickly fixed it.After a while, the owner of the black and white TV came back. Guo Yunda asked for 60 yuan in repair fees. Liu Xiaochuan finally understood that there was no specific standard for charging for this product. As long as it was a color TV, the repair fee would be higher than that of a black and white TV.

In the next month, the TV repair business was booming. In just over a month, Liu Xiaochuan earned more than 2600 yuan from Guo Yunda's repair shop. If he had known that repairing TVs was so profitable, he would have started a few months in advance.

Liu Xiaochuan was very puzzled. Later he figured out that in his previous life, he only learned to repair TVs in 96, and now it is 91. TVs have just become popular, the failure rate is still very high, and there are relatively few places where TVs can be repaired. So as long as you can repair it, there is still a market.

Liu Xiaochuan's level is not that high, and there are several that have not been repaired, especially those that need to be replaced, which Guo Yunda does not have at all.

Guo Yunda learned quickly. By December, he could solve many small problems by himself. He became more courageous and dared to take apart color TVs and tinker with them. There were fewer TVs left for Liu Xiaochuan to repair. , revenue plummeted.Liu Xiaochuan also knew that he would not be able to do this job for a few days.

In December, Liu Xiaochuan only earned more than 1500 from Guo Yunda. Sometimes there was no work for Liu Xiaochuan for several days in a row.After New Year's Day, Liu Xiaochuan said to Guo Yunda: "I think you are basically able to practice now. I won't come here next week."

Guo Yunda was a little embarrassed: "Even though you are younger than me, you are actually my master. Since I learned how to repair TVs with you, I have made a lot more money every month. I happen to be free today, so I'll invite you out Have a drink.”

Liu Xiaochuan actually wanted to ask him, can he get cash if he doesn't eat?I followed Guo Yunda to a small restaurant and drank two bottles of beer. Guo Yunda said a lot of words of thanks.In the end, he actually gave Liu Xiaochuan 500 yuan to express his gratitude.

Liu Xiaochuan didn't want it at first, but thinking that he would be short of money later, he accepted it and said, "I am really short of money recently. I borrowed these five hundred from you. I will pay you back double before summer."

Guo Yunda thought he just said that and didn't care. He really wanted to give it anyway.I just feel that what Liu Xiaochuan said is a bit false.

Liu Xiaochuan naturally didn't care what he thought and said goodbye to Guo Yunda. On the way back, he remembered that there was an evening class that day.

I hurried to the tutoring class, washed my face and rinsed my mouth. Fortunately, I didn't drink enough wine, so I couldn't see it on my face.Entering the classroom, students were already waiting there.

"Today we will do a comprehensive exercise on the momentum theorem and electromagnetism. For this problem of Ampere's force in a magnetic field, if we are looking for displacement, what formula should we first think of using?"

"Use the kinetic energy theorem, right, teacher?" the student asked weakly.

"You didn't listen carefully, did you? I said in the first sentence that today's theme is a comprehensive exercise of the momentum theorem and electromagnetism. What about the kinetic energy theorem? However, for this kind of displacement problem, we do tend to think of kinetic energy first. Theorem. But there’s a problem.”

Liu Xiaochuan paused, asked and answered: "What's the problem? The kinetic energy theorem requires force multiplied by displacement to express work. In this type of question, Ampere's force is a variable force and cannot be multiplied by displacement to express work, so there is no way to express it. No need to use the kinetic energy theorem.”

"Then what should we do, teacher, use the momentum theorem?" the student asked.

"That's right, use momentum, change the product of current and time into the amount of charge in the formula, and then use another formula. The amount of charge is equal to the change in magnetic flux divided by the total resistance of the circuit. In this way, the momentum theorem and the magnetic field are connected. . The magnetic field intensity remains unchanged. Find the change in the area enclosed by the conductor rod and the wire frame, and then find the displacement, and you can solve it."

"I understand, teacher, this kind of question is indeed a bit convoluted!"

"Yes, so you need more practice to master it. Okay, let's do the questions!" After a few more big questions, get out of class was over.

For science teachers, especially in high school classes, it is actually easier to start classes than in liberal arts classes. You don’t have to teach all the time. The main reason is that using your brain will make you tired. When students do exercises, teachers can take a break.

If you keep talking, not only will the teacher be tired, but the students' learning effects will also be poor. Tell knowledge, practice, correct mistakes, teach again, and practice again. This sequence is a virtuous cycle, but the learning effect is very good.

After class, I left the tutoring class. It was already snowing outside. This was the first snow in 92, and a thick layer had already accumulated on the road.When I returned to the downstairs of the rental house in the snow, I found a person standing at the entrance of the corridor. I couldn't see clearly in the dark, but I just felt that he was tall.

Before Liu Xiaochuan could see the man clearly, the man spoke with a cry in his voice: "Xiaochuan, you are finally back."