How to learn electricity in high school physics How to learn high school physics well? How to learn

High school electricity is not difficult, the exam is generally not simply a problem, the electric field must first understand the basic principle of the electric field, pay attention to the difference between the electric field line and the contour line, the electric field line and the contour line of the two lines to eat thoroughly, the electric field will take more than half, on these two lines the proposition is the eternal melody; The second is the combination of electric field and gravity field, electric field and gravity field, magnetic field, this involves kinetic knowledge, electric field is generally an additional force, pay attention to the role of each force, do this kind of problem is the most likely to leak force, so you must be careful.

The circuit looks a little complicated, in fact, everything is the same, the focus is on the link of the sliding rheostat, whether it is a shunt or a voltage divider, the two basic models must be very familiar, and there is to pay attention to whether the internal resistance of the power supply can be ignored, the difficulty is to judge when a certain resistance in the circuit changes** voltage is large or small, **current is large or small, and the potential problem in the circuit, just at the beginning you can calculate step by step according to the formula learned, this method is accurate but very troublesome, do more than you don't needYou can quickly judge it based on the characteristics of each circuit.

Electricity and magnetism are inseparable, when encountering this kind of electromagnetic combination problem, you should be careful, distinguish ** is the electric field line ** is the magnetic field line, and whether gravity can be ignored (the gravity of charged particles in the general question can be ignored, if it is a charged ball can not be ignored), what movement of charged objects in the electric field, what movement in the magnetic field, do not be confused, it must involve mechanical knowledge. At this time, you should know when to use the left-handed rule and when to use the right-hand rule, and don't use it the other way around.

Electricity is also often combined with work and energy problems, learning to solve this kind of problems is also the same, the law of conservation of energy is an eternal melody, as long as you pay attention not to leak work, do not leak heat, and do not leak the potential energy of particles, kinetic energy, this kind of problem can generally be solved correctly.

In short, to learn electricity, the first to be familiar with, master the basic knowledge of electricity, the basic model is not only to know the level of understanding, must reach a very familiar realm, the main knowledge to be familiar with the heart, the second is to be careful, do not see a complex diagram on the upset, this is a taboo in learning, careful analysis is the best policy, electrical knowledge is very flexible, will definitely be combined with other knowledge, when learning to contact more problems of the combination of multiple types of knowledge, I listed some common situations above, of course, there are some other situations, so in normal times, it is necessary to calm down and develop the habit of carefully analyzing problems.

The last thing to say is to make a set of wrong questions, learn physics can not be less wrong problem set, collect the questions that you usually do wrong, you can copy it, it is convenient to cut and paste, you should look at it usually and before the exam, it is definitely beneficial; In emphasizing the problem of habits, usual learning is to cultivate a learning problem, not only physics, all disciplines are the same, pay attention to their usual study habits, their usual examination habits, pay attention to correct bad study and examination habits, these are closely related to the performance of the college entrance examination, the high level and low level of the college entrance examination is not accidental, and the habits that are usually formed. I wish you good in electrical science, physics, and good results in the college entrance examination.

Connect with real life and carefully comprehend concepts.

It's very simple, start with the formula i=u r. Resistance, current, voltage You must understand what these are, but the most basic, start with the basics. Thinking should be active and abstract thinking should be valued!!

Think more about reality in light of reality. It's much easier than math, Chinese, and English.

High school physics is divided into 5 modules: Mechanics and Kinematics, Electromagnetism, Optics, Thermal, Modern Physics and Frontier Science.

It is possible to test in a variety of question types, and it is necessary to be able to use the left-handed rule to determine the direction of the Lorentz force, and pay special attention to the force analysis of charged particles with different properties. There are often propositions that combine the different characteristics of the Lorentz force and the electric field force. The test question type can be multiple-choice questions or calculation questions, which can be a separate proposition in this test center, or it may be combined with Newtonian motion and circular motion, focusing on the characteristics of the uniform circular motion of charged particles in a uniform magnetic field and the centripetal force provided by the Lorentz force.

Electricity and heat are the same, these topics require you to understand what they say, the general high school can not do in-depth, even if the competition is the same, but to understand the concept of the requirements accurately, not only accurately, and the requirements of point-to-point knowledge connection, the formation of a network of knowledge structure, inferences, in order to face the topic without hurry, in the college entrance examination, these questions can not be wrong, and to respond quickly! Electricity, including electrostatics midpoint charges, electric fields, electric potentials, and their properties, calculations (potential scalar calculations, electric field vector calculations), circuit analysis.

First of all, you need to do a good job of pre-studying, understanding the basic concepts, such as the meaning of electricity, especially the circuit diagram to read several times.

When you are in class, you should listen carefully to the class, especially when the teacher is doing experiments, you should study seriously, and you can also ask the teacher to borrow experimental instruments to do experiments for you after class, so as to enhance your practical ability.

Do more exercises, although the tactics of the sea of questions are not advocated, but the science subjects need to be practiced more, so that they can be more flexible. Remember, it is important to preview and summarize, do your own questions after the preview, and then summarize some methods.

As long as you do a good job of pre-studying, it is not so difficult to summarize often, and it is better for you to be one or two lessons ahead of the teacher.

Electricity includes electric fields, steady currents, magnetic fields, electromagnetic induction, and electromagnetic waves.

One. Important Concepts: Electric Field Strength (E), Electric Field Force (F), Electric Potential Difference (U), Electric Potential, Capacitance (C); Current intensity (i), electromotive force (e), road-end voltage (u), electrical work (w), electric power (p), superconductor (r=0); Molecular current hypothesis, magnetic induction intensity (b), magnetic flux ( ), ampere force (f), electromagnetic induction phenomena, induced electromotive force, Maxwell's electromagnetic theory.

Two. Difficult knowledge points of physics and electricity in high school.

1.Charged particles must be subjected to the electric field force in the electric field, and the direction of the electric field force (f) at this point is the same as the direction of the electric field strength (e).

2..Charged particles are not necessarily affected by the Loren force in the magnetic field, and when forced, the force (f) is perpendicular to the magnetic induction intensity (b), and the force is also perpendicular to the direction of velocity.

3. Understand the relationship between electric field lines and electric field strength (e) and electric potential (u).

Three. Important laws of high school physics and electricity: Coulomb's law (f=kq1q2 r2); Ohm's Law; Ohm's law for closed circuits: i=e (r+r). Joule's law, the law of electromagnetic induction (e=t, e=blv).

Four. Applications of three important rules: Ampere's rule (i.e., right-hand spiral rule) is used to determine the direction of the magnetic field generated by an electric current; The left-hand rule is used to determine the direction of the ampere force (or Loren magnetic force) experienced by an energized wire in a magnetic field; The right-hand rule is used to determine the direction of the induced current;

Five. In electric or magnetic fields, Newton's laws and kinetic energy theorems can sometimes be used to solve problems.

In fact, junior high school physics talked about electricity (what force, sound, heat, electricity, light), but it was not very deep. He was able to go back to our first why, but did not answer our second why. High school physics will answer our second why, and the third why ......High school physics and electricity are more profound, and they are explained and explained, and they are also more extensive.

Like the same charge repels each other, the different charge attracts each other, and we only know that this is the case in junior high school. The high school will answer why this is the case, and then the force will be talked about. Finally, there is the relationship between electricity and magnetism, which makes our understanding of the world more profound.

The original answer is as follows:

where y=(1 2)at in acceleration.

a=f m=qe m=qu2 md, so.

y=(1/2)×(qu2/md)×t²……From the original l=v0t, we get t=l v0 ......From the first formula of the original solution, we can obtain:

v0²=2qu1/m……Substituting this equation into t = l (2qu1 m) ......Substituting y=(1 2) (qu2 md) (l 2qu1 m)=u2l (4u1d).

Note: 2 in u2 is a subscript.

Let the acceleration potential difference u and the deflection electric field be e, and if the orbit is to be the same, the horizontal direction corresponding to y should be the same at each time.

Then the later velocity is [2(qu1) m], then x= [2(qu) m]t

The y-axis is the acceleration motion, then it is y=1 2(qe m)t Assuming x is constant, then it depends on whether y is related to q and m, then at this time, we get q m=x (2ut) and bring in y, we get y=x e 4u

It can be seen that when the value of x is determined, the magnitude of y has nothing to do with q and m; It may be difficult to understand this; To put it another way, let's bring in the number, when x=0, y is a value, and this value has nothing to do with q and m; The same is true for x=, until any definite value of x is deflected out of the power plant, and y has nothing to do with q and m. It is only related to the strength of the deflection power plant and the potential difference of the acceleration power plant. Or you can put:

y=x e 4u is a quadratic function where the independent variable is x.

If you study physics and electricity in high school, the most important thing is related to formulas, and then you have to use them flexibly.

Be sure to memorize those formulas first, listen carefully to the teacher's explanation, and it is best to push out those slightly more complex formulas by yourself (very useful), and then do the exercises.

First of all, you have to be interested in physics and electricity, so that you don't find it difficult, and then read more books about it, and most importantly, interest!!

There are mainly only a few parts, Ohm's law, Ampere's law, electromagnetic induction and other parts of the mastery point.

To analyze circuits, first of all, you must memorize the formula, and remember it in order to use it flexibly. When you encounter a problem, you can check the information to solve it, and you will know what to do when you encounter a problem. If you don't have to ask the teacher less, of course, if you can't solve it, you must ask the teacher.

In fact, it is similar to junior high school, pay more attention to summarizing, do more questions, analyze circuit diagrams, and master various knowledge points of electricity meters.

Don't be nervous, just follow the teacher's ideas and learn step by step, it's actually very simple.

The topic was written faster, Liu Bei will be better than hoist.

Do more questions, if you don't understand, you must ask, and you will be proficient in the relationship between concepts and formulas.