[The fat man is crazy, the fat man is crazy, he is outgoing, begging for subscriptions, rewards, and monthly passes. Pen @ fun @ pavilion wWw. ｂｉｑUｇE。 ｉｎｆｏ】

……

Liu Chen took the chalk and said loudly: "In the circuit analysis studied in junior high school and high school in the past, whether it is parallel, series, or parallel and then connected in parallel, this way of circuit connection is generally very intuitive and easy to imagine, and we learn [circuit theory] is very different is that many complex circuits cannot be imagined, and can only be rationally analyzed through KCL and KVL and various transformations. ”

With chalk, ABCDEFGH was marked on each vertex of the square connection to facilitate explanation, and said: "The resistance connection method of such a space is obviously no longer able to entangle the relationship between series or parallel, we need to draw out a more important idea, if this diagonal imagines a plane divided into two pieces, then it is clear that the two sides of the split are symmetrical, everyone should be familiar with the bridge, right?"

Ling'er was about to get up and fight side by side with Liu Chen, but seeing that he was calm and calm, she felt that he could solve it, so she turned to watch.

Liu Chen said and drew a simple electric bridge on the blackboard, the so-called electric bridge is composed of four resistors, two by two in series in parallel after the connection, as long as the two sides are in equal proportional relationship, then the series point is the equivalent potential point, whether the two points are short circuit, open circuit or connected to the resistor that is arbitrarily blocked, it has no effect on this bridge, because there will be no current flow at all.

This is a very important idea in [Circuit Theory] to analyze difficult and complex circuits.

"Now everyone should understand the concept of equipotential point, right?" Liu Chen said this, and the students who were waiting to see the excitement obediently closed their mouths, but recorded them in their notes, and their intuition told them that the method Liu Chen talked about was very effective, and the explanation was very simple and strategic.

In particular, Zhuo Ling's pair of beautiful eyes also looked at Liu Chen, recording carefully, and was shocked in his heart, he even studied the circuit so deeply.

"So let's go back and look at this simplified block resistance group, because all the resistance values are R. So DBH three-point equipotential, CEG three-point equipotential, we can add a short line between the two sets of equipotentials, and it won't affect the connection relationship anyway. In this way, it looks clearer, can you see it?"

Many of the students still shook their heads.

Liu Chen said helplessly: "Okay, then let's put it on the plane and look at it more clearly." As he spoke, he drew the floor plan according to the connection, which made it clearer and clearer. With the addition of short-circuited cables, simplification is easy.

In this way, these six resistors are in parallel, these three resistors are in parallel, these three resistors are also in parallel, and then connected in series, it is easy to find the result, 5R/6, and then in parallel with the following R, the whole simplified result is 5R/11. Actually, this topic could go a little deeper. ”

Speaking of this, Liu Chen felt that he could expand it, and drew several simplification of the resistance of the cube, one side of the diagonal has resistance, find the resistance of the other side of the diagonal two points, and the diagonal has no resistance to find the resistance of the adjacent two points, and even talked about how to simplify when all the resistors are not exactly the same.

On such a topic, drawing inferences from one another, Liu Chen spoke for half an hour and told about eight situations. The students in the audience are listening carefully, they are all super scholars, and Liu Chen is easy to understand, these situations basically completely cover this kind of resistance simplification. It can be said that this half-hour lecture is enough for them to be able to make such a question when they face it again, you must know that this kind of question is almost every year, and even the graduate school entrance exam must have a question.

talked until the end of class, and Tang Jie listened to it with relish. To be honest, as an associate professor, he is usually very busy with projects, how can he have time to summarize so comprehensively, and when he listens to it, he also feels that he has gained a lot, and he can't help but look at Liu Chen suspiciously, this guy can't be a sophomore.

The bell rang for the end of class, and everyone felt that Liu Chen had been talking for so long.

For top students, there is nothing happier than acquiring knowledge, and you can't pretend to have goods in your stomach or not.

Tang Jie was the first to applaud and applauded warmly, and the classmates also applauded, it was indeed too exciting, Tang Jie's face softened, and he said with a smile: "This classmate, you can indeed see your beautiful girlfriend in class, but you must always take into account the feelings of other students, next time let's sit together, it looks convenient, hehe, classmates, let's get out of class." ”

"Well, I must carefully consider Mr. Tang's suggestion. Liu Chen responded with a smile, feeling that Mr. Tang was quite interesting, bright and upright.

"Hehe, the students have benefited a lot, after class. ”

Liu Chen was about to go down, but Tang Jie grabbed him and said with a smile: "You kid has a very high level of circuit analysis." ”

"I'm sorry, Mr. Tang, I'm not a sophomore, I accidentally ran to your class and caused you trouble. ”

Tang Jie just thought that this guy couldn't be a sophomore, it was too rebellious, and said sincerely: "Even if it is a freshman, it is not easy to reach your level, do you have anything to do later? If you don't come to my laboratory, I'll talk to you." ”

Facing Teacher Tang's eager eyes, Liu Chen was embarrassed to refuse, and nodded, "Okay then." ”

"That's okay, my laboratory is in 2207, you can send your little girlfriend first, anyway, I'm in the office later, and I'm not in a hurry. Tang Jie glanced at Zhuo Ling in the front row and said with a smile.

In school, super academic masters are always able to receive liking from teachers.

Zhuo Ling looked at Liu Chen with a smile, smiling without saying a word, and Yin Jun stood next to her, obviously preparing to take the light bulb as the end, looking at him vigilantly.

Liu Chen looked at Ling'er gently, she hadn't seen her for a few days, she was even more bright and moving, her white and tender face was red, she was still shy, her flawless skin, full of collagen, green silk behind her ears, and her delicate facial features were even more dazzling.

"I don't have a class for the next class, so take me to the library. Ling'er said generously.

Liu Chen smiled and nodded, Yin Jun also followed beside him, Liu Chen smiled at him: "Classmate, are you going to the library too?"

Zhuo Ling doubted: "Aren't you going to work at the gym?"

Yin Jun gritted his teeth and said goodbye.

He is obviously unwilling, he has been carefully hiding his love for Zhuo Ling, looking forward to moisturizing things silently moving the goddess, and finally winning the beauty, clenching his fists, no matter what, he is still willing to wait, but his emotions are a little out of control.

After he left, the two entered the library and went up to the second floor together, Liu Chen smiled and said, "Ling'er, I'm really happy today." (To be continued.) )