How can I learn electricity well in the third year of junior high school, and how can I learn it wel

If it is required as a test-taker:

The circuit diagram should be learned well, this is the most important, so that we can judge the direction of the current, the nature of the series merger must be clear, don't think it is simple, it is particularly important when doing the problem, and a moment of negligence may be wrong.

When solving calculation problems, find the equiquantity relationship and correspondence, you must learn the equation well, you can use you and i as the equiquantitative relationship of the equation, do more such problems, and the ability is to cultivate yourself. At most, there are only a few test methods for experimental questions, and you will not be afraid if you are familiar with them.

In fact, instead of doing so many questions, it is better to take a good look at the wrong questions, figure them out, and ask the teacher and classmates if you don't understand.

It's OK to use a few formulas flexibly, the problem in junior high school is whether you can gnaw on the book, it's not a matter of thinking, and you must work hard

We still have to do more experiments, and the function of experiments is incomparable to others.

Be sure to draw a picture when doing the question.

Find out the correspondence of the relevant physical quantities.

The formula is remembered and will be deformed.

In the case of complex circuit diagrams, generally speaking, the ammeter can be turned into a wire and the voltmeter can be removed.

It is also important to use formulas to find the ratio of electrical quantities between resistors.

These teachers usually have a special topic in class to talk about methods.

Our teacher spent several lessons dedicated to this.

Sums it up brilliantly.

I found it particularly useful.

In short, listening to the teacher is the last word.

After all, they are much more experienced.

The most important knowledge difficulty in the third year of junior high school is electricity.

Other knowledge teachers will help you consolidate and supplement when you review, and it will not be difficult to focus on electricity in the middle school entrance examination.

Therefore, it is recommended that you first and foremost listen carefully to the lectures.

Second, do more exercises related to electricity.

Third, if there is a problem, solve it immediately, and don't wait until the end of the pile.

Fourth, take homework seriously and improve the efficiency of completion.

Be sure to pay attention to the textbook, don't think that the questions in the textbook are easy!

Almost all the test questions are based on the questions in the textbook, and after certain changes, they become the questions you do, that is, they will never deviate from their origins!

Therefore, if you get every question in the textbook clearly, you will succeed 80%, and then you will pay attention to the experiment, and you must preview before the experiment, and the preview at this time is similar to doing problems, because in this process you will continue to apply the relevant knowledge content, that is, the theoretical part.

Then you must think about it and do it when doing experiments, and consider whether there will be any errors here at each step.

In this way, you will further understand the knowledge points.

In short, only if you truly understand the formulas, theorems, and laws in the textbooks. Complete.

Step Method.

How can I learn Ohm's Law?

Tool 1: Understand the concept and lay a solid foundation.

When the voltage at both ends of the conductor is constant, the current of the conductor is inversely proportional to the current in the conductor?

When the conductor resistance is constant, the voltage across the conductor is proportional to the current in the conductor?

This is the most difficult knowledge point for students to understand when they first learn Ohm's law, children will only use Ohm's law formula to solve problems, and the understanding of the concept is not particularly deep, this is what we should pay special attention to, in 2010, 2011 high school entrance examination multiple-choice questions are conceptual problems, so we should pay full attention to this kind of problem, for Ohm's law and the derivation formula, the former has both physical and mathematical significance, and the latter two only have mathematical significance, so it is disproportionate. Ohm's law is the core knowledge of the electrical part, which has a wide range of investigation in the high school entrance examination and is very flexible, which is the difficulty of the high school entrance examination

1.Concept Question 2Dynamic Current Analysis 3Range Value Question 4Proportional application 5The problem of the amount of change in the circuit.

These five types of questions have their own characteristics, but there are also similarities, that is, they are all applied to the basic knowledge, before doing the questions, we must master the law of current, resistance, and voltage in series and parallel circuits; Complex circuit analysis; Knowledge points such as the mutual transformation between circuit diagrams and physical diagrams can be broken through Ohm's law by taking five types of questions as modules.

What are the techniques of electrical experiments?

Weapon 2: Summarize and draw inferences.

Electrical experiment questions account for more than 10 in the examination in the past years, its importance is undoubted, electrical experiments are usually known for "miscellaneous", the question type is messy, unpredictable, if students do the question, the progress will not be great, because can not grasp the law of problem solving. Therefore, the electrical experiment questions must be summarized, for example, there are more than a dozen kinds of simple resistance measurement experiments, for each circuit diagram, the formula is not to memorize, all changes are inseparable, the formulas used are r=u i, and these methods need us to understand and induct.

What are the rules of comprehensive questions in electricity?

Tool 3: solidify the model and follow it step by step.

The penultimate question of physics in the high school entrance examination is a 7-point electrical calculation question, which we also call the electricity comprehensive question, which seems simple, but it hides a mystery, as long as you are not careful, you will fall into the trap of the questioner. What are the rules of doing comprehensive questions about electricity, in fact, it is very similar to the force comprehensive, and there is also a fixed routine for doing this question:

1.Transform from physical diagram to circuit diagram.

2.Make an equivalent circuit for each case.

3.Proportional formulas are applied to establish equation relationships based on the connections between states.

4.Solve unknown quantities.

Learning Ohm's law is a crazy problem, and the future law of electric power and heat is better, and it is recommended that you buy a book to start the homework and his electricity is still good.

1. Current, voltage, resistance and charge are the four basic concepts in electricity, and when learning electricity, we must deeply understand these four concepts to lay a good foundation for the subsequent study of electricity.

2. The units of these four physical quantities should be memorized and converted proficiently.

3. Ammeter and voltmeter are two important instruments in electricity. * The ammeter should be used correctly in the size of the two ranges of 0-, 0-3a. 1) Connect in series with the circuit under test, 2) let the current flow in from the positive binding post and flow out from the negative binding post, 3) It is never allowed to connect the ammeter directly to the two poles of the power supply to measure the current, which will cause a short circuit and burn the power supply and the ammeter.

The voltmeter has two ranges, 0-3V, 0-15V, and should use the voltmeter correctly. 1) Parallel to the circuit under test, 2) Let the current flow in from the positive binding post and out from the negative binding post. 3) You can use a voltmeter to directly measure the voltage at the two poles of the power supply.

4. The role of voltage is the cause of the current in the circuit. Resistance is a property of conductors, how should we understand this property of conductors? 1) The magnitude of the total conduction resistance is independent of the voltage at both ends of the conductor and the magnitude of the current in the conductor.

2) The factors that determine the size of the resistance are: length, cross-sectional area, material and temperature. 3) Conductor resistance can be expressed as the ratio of the voltage at both ends of the conductor to the conductor current.

5. The section on sliding rheostats is a key chapter, which requires mastery: 1) production principles. 2) Construction.

5) An understanding of the meaning of the sliding rheostat nameplate. For example: 30W, 1A, the first term means that the maximum resistance value is 30 ohms, and the second term means that the maximum allowable current is 1 amp.

6) The variable resistance box reading value is also the content of the test (twisting who reads whom).

6. The relationship between current, voltage and resistance in series and parallel circuits (6 formulas) should be mastered: series: 1) i=i1=. 3) r=r1+r2 in parallel: 1) u=u1=. 3）1/r=1/r1+1/r2

Give you a formula: review the problem to identify the circuit, dismantle the diagram known, establish a relation, and solve the equation simultaneously. The meaning is to understand the meaning of the question by reading the question, and then according to the circuit changes, remove the corresponding circuit sketch (nothing more than series, parallel, and separate simple circuits, and the high school entrance examination does not test the mixed connection calculation), and then mark the known conditions next to the sketch, and list the equations according to the eight characteristics of series and parallel connection and Ohm's law.

Then solve the equation and the puzzle will not be difficult.

Grasp the basics, do more exercises, and do more questions from previous high school exams.

Read more textbooks to understand the principles, do some synchronous exercises, such as books on important and difficult points, and understand the topics in the reference books.

Be sure to lay a good foundation, communicate more, and do more exercises appropriately.

Before doing a question every time, take a good look at the relevant example questions, understand them thoroughly, and find out the ideas for solving the problems. When you do the problem independently, follow the steps of the example problem solving, develop the habit of solving the problem systematically, and don't solve the problem with a hammer in the east and a stick in the west.

Make sure to get the problem in the future, and immediately have a rough way to solve the problem.

You should develop the habit of solving problems independently, even with the help of other students, you must do it again independently.

Don't engage in sea tactics.

Learn physics to see more, ask more, do more hands-on, physics is a very experimental discipline, you not only have to watch the teacher do a variety of demonstration experiments, but also do a lot of experiments by yourself, some experiments can be done at home because of the ugliness, it is recommended that you find some popular science physics books to look at first, improve your understanding of physics, interest, do not rigidly memorize definitions, memorize formulas, set of formulas to solve problems.

There are many basic formulas in physics in the third year of junior high school, as well as various proportional relationships, just remember the formulas and do more questions.

Personally, I think that the professors in the relationship between various proportions are very bad, because they have to rely on rote memorization, in fact, if the landlord has the opportunity, look at the analog circuit in the node method and other methods are easy to understand and help to calculate.

Formulas must first be known, and I personally think that we should do more experiments to cultivate interest and at the same time be familiar with circuits.

First of all, we must have an image understanding of electricity. The directional movement of the charge produces an electric current. In junior high school electricity, the current in metal conductors is mainly studied, which is formed by the directional movement of free electrons in metals.

The direction of the current is the opposite direction of the directional movement of electrons. The basic concepts should be clear. Then the vein is the power supply that provides the voltage, and the voltage produces the current.

The relationship between voltage, current, and resistance. Voltage and current meters. The relationship between voltage, current, and resistance in series-parallel.

Just figure it out. Very simple.

Think of the current as the flow of water in the water pipe, the water flow of the main pipeline is equal to the sum of the water flow of each sub-pipe, the power supply raises the water, and the water flows down from each electrical appliance, and the total height of the increase is equal to the sum of the water reduction height of each electrical appliance.

Master the basic formulas, do some simple exercises first, and then do some difficult ones after learning to apply them, and you can basically do it.

It's not that hard. First of all, don't be afraid of him, and thirdly, diligence can make up for it.