What is the focus of the Electricity section of the High School Physics Competition in High School P

In recent years, the Olympiad has paid less attention to the investigation of electrical knowledge. Knowledge of electric fields may include potential calculations, charge equivalence, motion trajectories (possibly combined with rigid body mechanics such as angular momentum), complex capacitors, and so on. The constant current test center is annoying, but I haven't taken it for a long time.

Resistance (often tested infinite resistance) equivalent, circuit equivalent, capacitor series and parallel, multi-power supply circuit. The most difficult thing is to combine these to examine. I took the exam in the 90s of the last century, which was more annoying and difficult, and then I basically didn't take the test.

The examination of alternating current is also very rare, and it is enough to understand the various concepts in the two three-phase alternating current electrolysis methods.

Half space is 1 2 c The capacitance of the other half of space increases: 0. Then 1 2 c is the latter equation.

If you have the ability, the best way to play the foundation of the competition is "The Road to the Gold Medal", but this book is now out of print Zhang Datong's "Physics Competition Course" (three books) is also a good book to lay the foundation of the competition, and then Cheng Jiafu's "Middle School Olympiad Physics Course" (mechanics, electromagnetism), it is recommended that these two books be read intensively, if you can eat these two books thoroughly, it should be no problem to save one, and then, you can use Shen Chen's "Higher and Better Physics", most of which are new questions, There are also semi-final questions, and the above books are the best evaluated books in the physics competition.

Electricity is recommended to buy a copy of the electromagnetism to see, our school used this set in the first round.

The constant current is relatively simple in physics.

1.Bulk conductor resistance calculations.

Equivalent to a point charge or integral).

2.Complex circuit calculations.

a.Kirchhoff's law (two equations: nodal current and loop voltage equation) bThevenin's theorem (also known as the equivalent voltage source method).

c.Knowlton's theorem (also known as the equivalent current source method).

Transform (emphasis added).

3.Infinite resistance network calculation, 1D infinity, 2D infinity, 3D infinity.

One-dimensional methods often employ the method of infinity + 1 = infinity.

Two-dimensional and three-dimensional mainly make use of symmetry.

Hehe, I'm a physics teacher. To be honest, the most abstract and difficult part of high school physics to learn is the electrical part, especially the electromagnetism part. However, it is not very difficult to learn well, and the electromagnetism part is more abstract, so when encountering exercises related to electricity and magnetism, you may wish to build a physical model on scratch paper first, that is, to simply describe the motion of electrons in the magnetic field and the force of electrons in motion.

After that, combined with Newton's laws of motion, I think if you do this, the problem will be solved! Of course, science always runs and practices this lifeline, and I think the practice is not in the tactics of Haiti, but in the refinement and thoroughness. You might as well find one or two typical test questions to do, of course, in the process of doing it, I want you to think independently and not rush to ask the teacher.

Even if you can't think about it for a while, don't give up. It's not too much to spend a lesson or two thinking about a problem alone, or even a day or two of thinking about a question--- I think it's very important: first, the process of thinking is actually the process of your improvement, and secondly, going through this kind of thinking helps to develop the resilience of thinking, and it also helps to enhance self-confidence.

If you think my method is suitable and practical, please help to support it!

The key to learning electricity well is understanding.

I have a similar experience as you, physics has always been good, but after winning the second prize in the national competition, I am also proud, and my grades have declined. I think that learning physics should do more problems, and the same is true of electricity, lay a good foundation, see more question types, and pay attention to your own summary of problem solving methods, summarize wrong questions, etc., there is nothing difficult in electricity, adjust your mentality, don't be proud, and don't be stunned when you see electricity, tell yourself in your heart that I can do a good job before solving problems. If you are good at physics and have energy, it is recommended that you start preparing for the competition now, which will be beneficial to your future studies and independent admissions.

Hehe, I'm a freshman. High school physics is piled up with a sea of questions, to tell you the truth, physics in the first semester of high school is not difficult at all, don't be careless. Anyway, it's just to keep doing questions and summarizing.,Don't let your classmates do more questions.。。 Huh

Some physical models can be summarized.

What about high school physics? What are some good ways to study?

Now there are many friends, all say that for high school physics is a relatively difficult subject, which makes physics a kind of sore in the hearts of many high school students, in fact, learning high school physics is also very simple, as long as you master good ideas, cultivate your own study habits, let yourself like this subject, in fact, it is relatively simple.

High School Physics Textbook.

1. Learn more, observe more, and think more.

In fact, high school physics is about some theorems of things in nature, these are many things around us that contain these truths, there is physics everywhere in life, for example, every time we take a car, we can see the outside world and the things outside these cars are going backwards, this is the reference in our high school physics, this knowledge point, there is knowledge everywhere in life, you have to experience it with your heart.

As long as we have an eye for discovery, you must look more at the many phenomena in your life, whether it is natural or life, you also have to look at the stars at night, see their changes, you will also find light and heat in physics and some law problems. This knowledge is still present in our lives.

1. Learn to start with theorems.

You have to attach great importance to some theorems and some dead concepts and some laws, but you not only have to remember this knowledge from time to time, you have to learn how to use it, this is the key, smart children are using these formulas and then applying them to their own mistakes, from which to find the problem, you also have to do from a small mistake, you can review a lot of knowledge, it is really a double harvest, which is also the key to whether students can open up in high school physics.

Second, change the incomprehension to be very proficient.

For learning, if you like this subject more, the better you will learn, maybe for various reasons to make you like this subject, maybe because of the teacher, some teachers grasp it tightly, you learn this subject very well, but some students just like this teacher and like this subject, if you change the teacher, you will not learn well, in fact, this is harmful to yourself.

High School Physics Exam Papers.

Read every textbook, read every unit, learn every problem, have key insights and solutions for every exercise in high school physics, maybe they use the same knowledge, as long as you remember a theorem you can do many similar problems.

The best way is to do more questions, remember not to be able to remember, be sure to write down.

The key to physics is to understand, and at the same time, we must be diligent and thoughtful, and ask questions if we don't understand.

(1) Including electrostatics, constant current and electromagnetism.

Electrostatics is mainly combined with mechanics and kinematics, involving electric fields, electric field forces, Coulomb's law, the trajectory of charged particles, electric potential, electric potential energy, capacitance, etc.

The content of constant current is similar to that of junior high school, that is, there are more Ohm's laws in the closed loop, and there are more electromagnetism, which is more difficult and very important, mainly including magnetic field, Lorenzi force, the motion of particles in magnetic fields and electromagnetic mixed fields, Faraday's law of electromagnetic induction, alternating current, electromagnetic waves, etc.

This is just the backbone, there are all kinds of branches, such as experiments, etc., 2) people have differences, can not say whether it is difficult in mechanics or electricity, this has to rely on their own slowly experience, but to be honest, if you don't engage in competition, high school electricity is okay, focusing on cultivating physical thinking, that is the most difficult.