The training center was set up in a suburb area, and after all the students got off the bus, they spent about two hours in their rooms to put their luggage, eat, and get acquainted with the whole school.

Finally, in a classroom, the members of the 12 provincial teams took their seats according to the seating charts prepared in advance, and took out their pencil cases and notebooks.

On the podium, Wei Tianshuo took a sip of tea to moisten his throat, then took out a brand new piece of chalk and wrote a line on the blackboard.

【Basic Rules for the Finals】

After writing, he turned to look at the students below and said, "I believe that most of the students sitting below already know the rules of the finals very well, but even if you know it, listen to me again." ”

"First of all!"

Wei Tianshuo suddenly raised his voice by two notches, almost startling Wu Bin, and the others reacted similarly, and they all sat up straight and continued to listen.

"Before that, I want to give you a general idea of the difficulty of the finals, and here I will describe it to you from the side, a total of two points."

Saying that, Wei Tianshuo raised his index finger: "First point, as long as you can get any place in the finals, then the mechanics that accounts for 4 credits in the first semester of Beijing University, you don't need to listen to it, just take the exam directly." ”

The students below nodded their heads.

"As for the other point, I believe you are all very clear, as long as you get the gold medal, that is, when you are anti-guest, all the admission letters of all universities in China will be placed in front of you, and you can choose."

"This is naturally a recognition of your learning level, representing that among this group of high school students in the country, no one can beat you in terms of physics knowledge!"

Although Wu Bin had already understood these words in his heart, he still had a feeling of blood boiling when he heard Wei Tianshuo say them, and I believe that several other classmates were the same.

"Doesn't that sound good? However, the more beautiful things are competing for the more people will naturally be, and the difficulty of the semi-finals is more difficult than the preliminaries, and I believe you all know very well, so I can tell you clearly now that the difficulty of the finals is much more difficult than the semi-finals, and your opponents will also be promoted to the national level, how strong I believe you all understand without me. ”

"Every question in the finals is created to make it difficult for you, and some of the ideas may not be found in all the problem collections and real questions, you can only rely on your own knowledge to solve them, and there is no routine to move."

After Wei Tianshuo finished speaking, he glanced down, and found that most of the classmates were in a state of unfazed, and it was estimated that many people had said these words, but there was one student who behaved strangely, he was actually laughing, and it was the kind of laughter with a little excitement.

'It should be called Wu Bin, right...... It's kind of interesting. ’

On the bus, Wei Tianshuo had already known all his classmates, and although he had only been together for a few hours, he had already remembered his names.

After reading the reactions of his classmates, Wei Tianshuo continued.

"I believe you have all practiced solving all the same type of problems in one way before, and the purpose of our training camp is to let you go further, so that after you get the paper and read the question, you will immediately understand which solutions the questioner has in mind, rather than what solutions there are really for this problem, which will help you improve efficiency."

The classmates below nodded again.

"Okay, I have a set of papers, you can do it first." After Wei Tianshuo finished speaking, he took out a stack of rolls from the podium.

It is unlikely that a student who will shout "ah" when he disagrees is going to do a paper is unlikely to sit in this classroom, so everyone in the classroom took out their pens, turned on the calculator, and entered a state of preparation after hearing that they were going to do the paper.

Wu Bin got the paper and habitually began to review the questions, and found that in terms of difficulty, it was not as hellish as he imagined, and they were all relatively common question types.

"Alright, let's get started." Wei Tianshuo announced after glancing at his watch.

As a result, all that remains in the classroom is the sound of the pen tip rubbing against the paper.

"Let's stop writing."

An hour later, when he was calculating the fifth mechanics problem at full power, Wei Tianshuo, who had been walking around and was in a state of patrol, suddenly shouted.

'Gan...... No way? Is everyone else done? ’

After thinking about it, Wu Bin raised his head and looked around, and found that the others were almost the same as him, and he was finally relieved.

At this time, Wei Tianshuo spoke: "Don't be nervous, you should also understand the difficulty of this paper, there is no problem, the function is just to test your efficiency." ”

Saying that, Wei Tianshuo glanced at his watch: "So far, the students here can basically control the time for each question within 15 minutes, which is very good." ”

Looking at the relieved expressions of most of his classmates, Wei Tianshuo smiled in his heart, it seems that everyone is very competitive.

"Then I've said all the premises, and now I'm officially going to talk about the finals."

"The total score of the finals is still 200 points, of which the experimental questions still account for 60 points, but the experimental questions in the finals will not be selected from any textbook, they are all direct propositions, in terms of difficulty, take last year's questions as an example."

As he spoke, Wei Tianshuo returned to the blackboard, picked up the chalk and began to write.

[Using the electronic components in the "Assembling Power Component Box", design a rectifier filter circuit that can convert AC voltage into DC voltage with maximum efficiency, and connect and assemble the designed circuit to make it a DC power supply]

Then, after writing down the experimental requirements, Wei Tianshuo nodded to the first question.

[Draw a design circuit diagram, assemble and measure.] 】

"Do you have any ideas at this point?"

When Wei Tianshuo wrote the question, Wu Bin was naturally already thinking.

'First input AC voltage 12V, then use bridge rectification, and then draw π filter circuit......

"Wu Bin, you come up and do this question."

Just as Wu Bin was thinking, Wei Tianshuo suddenly shouted.

Wu Bin nodded, walked up to the podium, took the chalk handed to him by Wei Tianshuo and began to draw.

(This is a circuit diagram, please raise your claws if you see it.) ）

After more than ten minutes, Wu Bin clapped his hands and said to the teacher, "It's done, teacher." ”

Wei Tianshuo nodded with a smile after reading it, "Explain how your circuit diagram works." ”

"Okay." Wu Bin nodded and began to point to the diagram and introduced: "The 12V AC voltage becomes the DC pulsating voltage after passing through a bridge rectifier circuit composed of 4 diodes, and then passes through a π filter circuit composed of electrolytic capacitors and resistors. ”

Saying that, Wu Bin made a shrinking gesture, "At this point, the amplitude of the voltage will be greatly reduced, and it will become a DC regulated power supply that can be used when the load is used." ”

Wei Tianshuo nodded with satisfaction and said: "Very good, you have already got 4 points, and then as long as you explain the role of each component in the circuit clearly, then you can take home 5 points for this question." ”