Yes, with a short. Nominally zero ohms. Run any current through it you want, but it will have zero voltage drop.
Jan
I have been following this thread from the beginning. Mr Rasmussen uploaded some measurements in his initials posts. Probably he had something more to show but then he decided not to show it because he has been under attack since then just because someone didn't like his wording? Surely not something I can see in every thread over here. I might be wrong but this was and is my feeling.
Listening impressions. In general, these are useless for me because 99.9% of the time they are flawed. This is not because I don't trust what people hear but because they are not reproducible due to lack of control on relevant parameters. First of all room acoustics. Sorry, equalization doesn't work for me.
All this just to say that such listening impressions might not be useful or relevant for everyone.
An example of current without voltage is setting a current going in a loop with finite resistance, then cooling it below the critical temp where the resistance disappears. The current will continue to loop despite zero voltage drop.
Of course, if you have a battery connected to a light bulb through a superconducting wire, there will also be current flowing through the wire without any voltage drop.
We are loosing the plot fast.
My response was to: you can have voltage without current, but not current without voltage.
That statement implied a source connected to a load. I maintain that you can have both referred to a load.
Was that not clear from my reasoning Mark?
Jan
Guys, get a grip. Ohms' Law is a "law". That means it is an imperial relationship that is based on observation over a long period of time and shown to be reasonable. It does not give any insight as to why a current flows or what makes a current flow, or whether a potential or potential difference is required for current any more than Newton's Law tells you why there is gravity. V = IR, or V = IZ has no meaning what so ever for R = Z = 0. Frankly I don't know why you are even bothering to argue about such nonsense.
Perhaps because of the confusion surrounding the simple issue of an impedance compensated speaker, trying to make it something it isn't?
There was even a claim here (which has been shuffled around but never actually admitted to be erroneous) that there's a Kirchoff's Law violation- and in this case, the law involved is the First Law of Thermodynamics. For a couple of parts thrown across loudspeaker terminals. Amazing. Just... amazing.
Not in the context of what iSream had posted #368 and your response #390. He was clearly not talking about a voltage drop over a load but that there must be a voltage (source) for there to be a current.
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Wow. This has been covered way more than should have been needed for something so fundamental.
The super conducting wire examples make sense to me but, even there, a voltage is needed to create the initial current.
Even if we have a zero Ohm wire in our circuit, dropping zero volts, any current flowing through that wire is created by voltage being applied earlier in the circuit.
-Chris
The super conducting wire examples make sense to me but, even there, a voltage is needed to create the initial current.
Even if we have a zero Ohm wire in our circuit, dropping zero volts, any current flowing through that wire is created by voltage being applied earlier in the circuit.
-Chris
Why a current flows? Rivers might help us figure it out.
They wouldn't flow anywhere if there was no water and
gravity.
They wouldn't flow anywhere if there was no water and
gravity.
Well if you saying that I can't create a current source without voltage involved, I say you can't create a voltage source without current involved. It really, really is mirror images.
Jan
I'm not going to argue with you about something so basic.
But, in my opinion, your "mirror images" talk is exactly the kind of "sloppy thinking, sloppy writing and unclear meaning" you complained about earlier in the thread. (post 372)
You are introducing vague concepts into what should be a pretty easy to understand technical discussion.
-Chris
Hi Chris,
Jan's information is perfectly clear. Very basic and correct too. You'd best spend some time on those concepts because they are so fundamental.
Jan has more experience in the audio game, plus electronics, than I think you give him credit for. Check out his web site.
-Chris
Jan's information is perfectly clear. Very basic and correct too. You'd best spend some time on those concepts because they are so fundamental.
Jan has more experience in the audio game, plus electronics, than I think you give him credit for. Check out his web site.
-Chris
What concepts should I spend time on? Voltage drops across resistance or impedance in a circuit? Seriously?
Ohm's law and the relationship between voltage, current and resistance is the very first thing I was taught in electronics school. I'm talking day one. Day two was how to analyze a circuit when various components are placed in series, parallel or combinations of both.
If "mirror images" is so clear, what is supposed to be a mirror image of what?
Jan is obviously a smart guy but I get the impression he's more interested in arguing within this thread than actually helping anyone understand the topic.
-Chris
I know that I'm probably the least knowledgeable person in this thread, overall. But arguing with me about something like Ohms law is just ridiculous.
Anyway, my previous post was kinda ridiculous too so I removed it.
Anyway, my previous post was kinda ridiculous too so I removed it.
Given the high proportion of Piled high and deep here and the high number of Engineers, with the odd chemist someone let in you should take heed of the famous saying
A lot of these guys were also herding electrons before you were a twinkle. Roll with it and you get to learn cool things.
Hi Chris,
You were questioning what Jan was saying, that's all. I don't know how experienced you are in electronics, but if you are in learning mode, and we all are, there is a lot of helpful information on Jan's website. You really ought to have a look. Also, he publishes an excellent "webzine" that is packed with information on audio topics. The authors come from the membership here.
No attempt to shame you here, just trying to lead you to helpful information. You should really check out Jan's website.
-Chris
You were questioning what Jan was saying, that's all. I don't know how experienced you are in electronics, but if you are in learning mode, and we all are, there is a lot of helpful information on Jan's website. You really ought to have a look. Also, he publishes an excellent "webzine" that is packed with information on audio topics. The authors come from the membership here.
No attempt to shame you here, just trying to lead you to helpful information. You should really check out Jan's website.
-Chris
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