Recent content by Jackson Lee

Thx a lot. You are really helpful, guy

Oh， it seems interesting. Maybe I will learn it laterly in wave formula. Thx

So, you mean if frequency is very high, then we have to use another novel way to deal with circuit analysis.Right?

I really hope I can see that graph. I am trying to imagine your described image and connect it with my question. If you can find it or come up with other possible explanations, please write it down here. I will feel very appreciative for it.

Sorry, I was confused. What do you mean? In clockwise direction, the inner current seems to be propelled to outside. However, in anticlockwise direction, the condition is reversed. Why are charge carriers pushed away in both conditions? Could you please state it a little more clearly?

Oh, yes. You are right. It is close to 5000km. Besides, what puzzled me most is in traditional method of electric circuit analysis, both AC and DC, we always assume current is same at every point in one transmission line, I mean if there is no branch, but if it is not the case as what we talked...

Oh, your explanation is clear and helpful. I suppose I get it. Besides, could you please explain from Wiki perspective? I have attached it at the first page. Perhaps, you will feel it interesting as well. Thx a lot.

We all know that poynting vector could be used to calculate energy transferred in AC system, but I want to know if that theorem could also be applied to DC current? How to prove this? And how to prove energy transferred in AC system could be calculated via poynting vector?

Hey, guys. We all know power of AC currents is transferred via EM waves, but we seldom use that to calculate power in AC system. The reason for this is wavelength is very long. I want to know if there is really existed a transmission line which is 500km, just the length of EM wavelength, then...

Hey, guys. There is something interesting about the skin effect, which also made me curious:wink:. Could you please help to solve it? The following is what I got from Wiki. It is said that, according to theory of induction, induced current would oppose the change of magnetic field. Then when...

Hi, Jartsa. Take it easy. We just come here to discuss questions and improve ourselves. If some words hurt you, I apologize for them.:bow::partytime: Actually, I suppose it is the statement that two parallel wires led to skin effect led to this minor debate, because the skin effect is caused by...

Yeah, that is what I want to say. I understand this part. Besides, Prof. Dave, could you please help me on the skin effect? Because I suppose there is another state, core effect, during certain stages.As for energy transmitted via EM wave, I have got it.:smile: Thx a lot.

That's ok. I don't care about this. They pointed out my problems and made me improved, so I am appreciative to all of them. Never mind about this, but thanks as well.:smile:

I have looked skin effect on Wikipedia and got the main idea, but there is something made me curious. The following is what I got from Wiki. It is said that, according to theory of induction, induced current would oppose the change of magnetic field. Then when current increases in the upward...

Yeah, actually, I am a student majoring in power. We seldom got involved with EM wave in the past and that is why I felt really surprised when reading AC current is certain type of EM wave. Maybe the author means AC electricity energy is transmitted via EM wave and I misinterpreted his words...