How do you co ordinate the teaching of electrical experiments at the junior high school level?

Physics is a science based on experiments, and after the implementation of the new curriculum standards, the examination of experiments in the high school entrance examination has undergone a fundamental change, from the examination of knowledge and conclusions in the past to the examination of process and ability. At present, most of the basic knowledge of electricity in the textbook of the People's Education Edition is based on students' experiments, such as Ohm's law, Joule's law and other important laws of electricity are also famous experimental laws. Therefore, the arrangement of electrical experiments is particularly important, and how to coordinate the teaching of electrical experiments in junior high school?

Let me personally share my opinion.

1. Make a list of the entire experiments to be done in electricity.

If you don't do things in order, then your experiment management will not be efficient. At the end of each experiment, make a list of things to do in the second experiment. This list includes the content of the experiment, the principle, the relationship between the context, the focus and the precautions, etc., and records them on paper or workbook.

Check back frequently before the next experiment begins.

2. Write down the next experiments on your list as well.

When you're done with the experiments you started planning, write down the next things to do on each of your lists. If your list is full, or if an experiment can be done the other day, you can count it as a plan for tomorrow or the day after tomorrow. Do you want to know the reason why some people tell you that they planned to do something but didn't get it done?

It's because they don't keep these things on record.

3. Refine the precautions for experiments.

Those are the things that students need to know before the experiment, such as how to use certain instruments and precautions. Those are what students need to master before the experiment, such as the experimental principle, those equipment are necessary, the students are completing the experiment, the most difficult place is in the **, we also have to evaluate**, and the rescue is what the students should do after the experiment, try to refine the experimental steps.

The experiment must be in line with the teaching progress, and it should be done wherever it is spoken, not in advance or delayed, otherwise the effect will not be good.

From shallow to deep, from easy to difficult, what can be combined with theoretical teaching in the end.

For example, when we talk about Ohm's law today, we can deepen it according to Pan Zhi's experiment.

Understanding of its definition.

If you go to the module, you can cross the theory class and the experimental class, and the effect will be better.

1. Formulas for current, voltage and resistance characteristics of series circuits.

i=i1=i2

u=u1+u2

r=r1+r2

2. Formulas for current, voltage and resistance characteristics of parallel circuits.

i=i1+i2

u=u1=u2

1/r=1/r1+1/r2

3. Other electrical formulas.

The electrical energy formula w=uit

Ohm's law formula i=u r

Electrical power formula p=wt p=ui

Joule's law formulas q=i 2rt

Hungry for all.

I'm from Tianjin, and the textbook may be different.

But I'll summarize it for you.

i=u/r u=ir r=u/i

p=ui=w/t=u^2/2=i^2*r

w=pt=uit=q

q=i^2*r*t

There's Ohm's Law, the formula for electric power, electrical work, electric heat, and that's probably it, I don't know if it's what you want.

But it's best to borrow notes from the good students in your class and summarize them yourself.

First, read the text information to clarify the known conditions of the problem and the problem sought;

Second, carefully read the circuit diagram and clarify the connection relationship of each component (the analysis circuit generally starts from the positive pole of the power supply, and follows the path of the current volt response to the negative pole of the power supply);

Third, the text information is briefly marked on the corresponding part of the circuit diagram;

Fourth, use relevant laws and principle formulas to analyze the solution to the problem, and connect the known conditions with the problem to be solved.

Fifth, solve the problem step by step according to the designed way to solve the problem.

Add me uc 43434541 I'll help you.

Or you may find it helpful to log on to this blog.

I think it's better to ask your own teacher, because your own teacher knows the key to your problem. Or find some training institutions to do some coaching in this area!

On the back of the electrical formula, several important knowledge points,

The third year of junior high school is tense about studying, and if you slack off, your grades will slip, so I'll tell you a few points:

Master the work and rest time, don't stay up too long at night, generally no more than 11:30 at the latest;

Listen carefully in class, (must be) raise your hand to speak, the general knowledge points will not be forgotten, and the most important thing is that some of the questions that the teacher has talked about will become the middle school examination questions as they are (deeply touched);

I don't recommend using the sea of questions tactic, but one or two books a semester is still essential, and it is very effective to sort out mistakes (especially in English).

To learn to ask questions, teachers are the ones who like to ask the most (ask appropriately, don't ask something extraneous).

A good learning attitude is also very important to take every question seriously

Don't learn to die (learn to be a nerd) and relax appropriately on weekends, and be able to relax when you can learn;

Complete homework conscientiously and learn to repeat the preview;

Finally, don't underestimate the enemy too much, otherwise.

With that said, I hope you can succeed。。

People's Education Edition Textbook.

1. Friction electrification and use a charged rod to attract light and small objects.

2. The same charge repels each other, and the different charge attracts.

3. Contact the electroscope with the electric rod.

4. Composed of the simplest circuit.

5. Distinguish between conductors and insulators.

6. The glass beads are heated and the conductor is transformed.

7. Connect the series circuit and the parallel circuit.

8. The bulb is connected with one and two dry cell batteries to observe the brightness.

9. Use an ammeter to measure the current.

10. Use a voltmeter to measure the voltage.

11. Study what factors are related to resistance.

12. A sliding rheostat is connected to the circuit.

13. Study the relationship between current, voltage and resistance.

14. Voltammetry measurement resistance.

15. The equivalent resistance of the resistor in series and parallel.

16. Voltammetry measurement power.

17. Joule's law.

No, I learned these things occasionally.

Serial-parallel circuits, Ohm's law, measuring the electric power of small bulbs.

Yes, the simplest parallel circuit, you drew it right, as long as the current meets the electrical appliances and separates, and the electrical appliances are merged through the electrical appliances, you can do it.

The second circuit diagram is the circuit diagram you gave, exactly the same, that is, the second wire is longer than the first one.

Excellent, correct!

The second drawing is the same as the first, no difference!

This is right, the circuit diagram has different connection methods, in fact, you can connect two bulbs in parallel and then connect the two sections of a bulb to the power supply

Yes, this is a junior high school parallel circuit, as long as the bulb is connected into a loop and then two circuits are pulled out on both sides of the power supply to connect, to make sure that it does not cause a short circuit.

I didn't learn it, but I'll learn it tomorrow.

It's a little rough, but the essence is right.