I didn t understand Ohm s law, how can I learn Ohm s law well?

Ohm's law: The current in a conductor is directly proportional to the voltage at its ends and inversely proportional to its resistance. It is expressed by the formula as:

i=u r where i is the current (amps) r is the resistance (ohms) u is the voltage (volts) It can be converted into two variants according to the above formula: u=ir r=u i But when calculating the unknown resistance The value of the known voltage and current should not be affected by its formula The resistance cannot change with the current through it or the voltage at both ends of it. When learning Ohm's law for the first time, there are usually some one-item problems that only tell two physical quantities and find the third physical quantity according to the formula.

After learning the series and parallel connection of resistors, you will be able to judge the various physical quantities of each electrical appliance according to the circuit diagram and the title text, and then calculate it through the formula, which is relatively troublesome.

Also, there are different ways to write in different places, like the way I learned to write: 1Draw the equivalent circuit diagram 2 first

Write known physical quantities3Write out the required physical quantities4Write the formula (if you don't find the current, you need to write its variants)5

Substitution Calculations 6Write out the answer.

Learning Ohm's Law well requires the following steps:

1.Understand the definition of Ohm's law: Ohm's law is one of the most fundamental laws in the basic theory of electricity, which describes the relationship between current, resistance, and voltage.

Specifically, Ohm's law states that when the resistance is constant, the magnitude of the current is proportional to the voltage; When the voltage is constant, the magnitude of the current is inversely proportional to the resistance.

2.Learn standard units: When learning Ohm's law, you need to understand some basic units of electricity, such as current intensity (amps), resistance (ohms), and voltage (volts).

3.Learn related formulas: To learn Ohm's law, you must master the basic calculation formula, such as i = v r, where i represents the current, v represents the voltage, and r represents the resistance. These formulas will help you understand the principles of electricity and apply them to real-world problems.

4.Practical exercises: Ohm's law is a practical theory that requires a lot of practical practice to truly understand and master. Electrical experimental equipment such as circuit test boxes or oscilloscopes can be used to conduct experiments or experiments.

5.Improve math skills: Ohm's law involves mathematical calculations such as multiplication, division, and algebra that are needed to perform circuit calculations.

Most importantly, practice as much as you can, practice applying Ohm's law often, and ask for help when you get stuck. Through continuous practice and learning, you can gradually grasp the concept and application of Ohm's law.

1) A brief description of Ohm's law is that in the same circuit, the current passing through a certain section of conductor is directly proportional to the voltage at both ends of the conductor and inversely proportional to the resistance of this conductor. This law was proposed by the German physicist Georg Simon Ohm in April 1826 in "Determination of the Law of Conductivity of Metal Defects"**.

2) Ohm's law formula i=u r

Note: 1. The i, u, and r in the formula must be for the same circuit 2. The units should be unified.

The unit of the electric calendar Li Liu I is An (A).

The unit of voltage u is volts (V).

The unit of resistance r is ohms ( ).

Ohm's law is one of the important teaching contents of physics and electricity in junior high school, and it is also an important test point in the high school entrance examination. So how do you learn Ohm's law? Below I will share with you how to learn Ohm's law in physics, welcome to read.

Ohm's Law of Physics is a learning method

Pay attention to experimentation and be diligent in experimentation.

Electrical experiments are a difficult part of high school physics, and they are also the content of the college entrance examination, so you must learn this part of the content well. Before doing the experiment, you must figure out the principle and steps of the experiment, pay attention to observation, and do a good job in each experiment. Students who have the ability can design some experiments by themselves and go to the laboratory for verification.

This is a great help to improve the experimental ability.

Lectures are combined with self-study.

Compared with the first and second years of high school, there is more teaching content and large classroom capacity, so students must pay attention to the teacher's explanation and keep up with the teacher's ideas. Listening carefully in class is the most direct and effective way for students to learn methods and improve their abilities. In the lectures, you should think positively, constantly ask yourself questions, and then get answers through the lectures.

In order to achieve high efficiency in the classroom, it is necessary to preview before class, pay attention to the connection between new and old knowledge, integrate the newly learned physical concepts and physical laws into the original cognitive structure mode, quickly master new knowledge, and smoothly achieve knowledge transfer. Preview not only increases the understanding of relevant content, but also improves one's reading comprehension ability and problem review ability. Over time, students' self-learning ability will also be greatly improved.

Review regularly and summarize.

In the process of learning, it is necessary to develop a good habit of regular review and summary. Review is not a simple repetition of knowledge, but a process of sublimation and improvement. One is to review on the same day, which is one of the efficient and time-saving learning methods.

The second is to review at the end of the chapter, clarify the main line of knowledge in each chapter, grasp its knowledge structure, and systematize the knowledge. Find out the connections between sections and chapters, and establish new cognitive structures and knowledge systems. It not only consolidates and deepens the knowledge learned, but also learns the methods and improves the ability.

There are not many things that need to be memorized in physics, and most of them need to be understood. Through systematic and effective review, you will find that the thick physics textbook is actually "very thin". Try to classify the practice problems you have done, find out the corresponding solutions, and change the bad study methods, study habits, and learning psychology as soon as possible.

"Ohm's Law" study cheats

1.Ohm's law and its application.

Ohm's law says that the current, i and so on u to divide by r

The correspondence of the three should be unified, the same conductor and the same road.

u and so on are multiplied by r, and r is equal to u to be divided by i

2.Series and parallel connection of resistors.

The series of resistors should be larger, and the total resistance is equal to the sum of the partial resistances, r=r1+r2

The resistance in parallel should be smaller, and the inverted sum of the sub-resistance is the inverted total, 1 r = 1 r1 + 1 r2

3.Measure the resistance of the small bulb.

To measure the resistance of a small bulb, the principle R et u divides i

A voltage and current meter, a bulb sliding rheostat is required.

The connection switch should be disconnected, and the resistance value should be adjusted to the maximum before closing.

Series circuit formula.

In the relationship of series circuits, the current is equal everywhere.

The total pressure is equal to the sum of the partial pressures, and the total resistance is equal to the sum of the partial pressures.

4.Parallel circuit formula.

The relationship between parallel circuits, the total current is equal to the sum of the tributaries.

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.

1 Know the cause and conditions of the electric current

2. Understand the concept and definition of electric current, and be able to perform related calculations.

3. Understand the definition of resistance, master Ohm's law and be able to skillfully use it to solve related circuit problems, and know the volt-ampere characteristics of conductors

Ohm's Law. The German physicist Ohm was the first to experimentally study the relationship between current and voltage and resistance, and finally came up with the law named after him

Contents: The intensity of the current in a conductor is directly proportional to the voltage at both ends and inversely proportional to its resistance

Expressions: Note:

1) The three quantities u, i, and r in the equation must correspond to the same research object.

2) A large number of experiments have shown that Ohm's law applies to purely resistive circuits (metals, electrolytes, etc.).

3) Summary. 1 Do not assume that in any conductor the current is proportional to the voltage, not in the case of impure resistive electricity

2 It is only a definition of internal resistance, not a determinant, and the magnitude of the resistance is not determined by voltage and current

Start with the simplest questions, since the formulas have been memorized, start with the simplest, the reason why you don't understand what the teacher said should be that you still have some defects in practical application You can ask your classmates for help

First of all, you have to put your mind on studying, read the book twice, look at the example problems in the book, and think about the problems you want to do. Slowly, the physical learning method will be formed. It's easy.

As a physics teacher, I suggest you do more questions, starting from the simplest textbook exercises, you must work the amount of training, Ohm's law has always been a major difficulty, the topic of the initial practice is not the difficulty, but the amount of questions, must be done, there are only so many formulas, but understand that the formula and the problem is not a concept, calm down, keep practicing, what specific questions can be asked to me, I wish you progress!

Nimaohm's Law!! It's OK to memorize a formula, if you're in high school, you can memorize a formula and usually do the next question, and science children's shoes should learn divergent thinking, don't turn science into liberal arts. Listening to class is a premise, don't be embarrassed to ask if you don't understand.

The main test point of Ohm's law lies in the circuit analysis of parallel and series connections, and you should pay attention to listening when the teacher talks about those chapters, and ask questions in time if you don't know how to do it, otherwise you will play soy sauce.

Preview before class, listen to the teacher in class, and review in time after class. Preview is the key, listening to lectures is the focus, and revision is even more important.

Ohm's law just need to memorize those 3 formulas and do more problems in this area. Preview before class, listen to the teacher in class, and review in time after class.

Be sure to memorize the formula and summarize it a few times. Formulas are exam artifacts.

Ohm's Law and Simplicity, Just Remember the Announcement, Don't Be Too Dead, Learn to Be Flexible.

If you want to learn Ohm's law well in junior high school, you must first understand the experiment of Ohm's law, and you must understand that Ohm's law experiment includes two aspects, the first is that when the voltage at both ends of a conductor is constant, its current is inversely proportional to its resistance, so this experiment must understand the control variable method, and know the role of the sliding rheostat in the circuit.

The other is that when the resistance of the conductor is constant, the current of the conductor is proportional to the voltage at both ends of the conductor, and the control variable method is also needed for this experiment, so if the two are the same high hole, then you will know that Ohm's law applies to the circuit situation in a conductor.

On this basis, after learning Ohm's law for some circuits, we will learn Ohm's law for the entire circuit. In this way, learning is more systematic, and you must learn to use Ohm's law to calculate. Current, voltage and resistance are three physical quantities.

Actually, it's not a hassle to calculate, as long as you know two of the three physical quantities, you can find the third corresponding, you have to remember Ohm's law it refers to the same circuit. It has the sameness. At the same time, he was referring to the same conductor.

At the same moment, the current and voltage are related, so it also has simultaneity.