Talk:Equivalent series resistance

message: How does leakage thro' the dielectric of a capacitor affect its ESR, I wonder??--Light current 04:26, 12 September 2005 (UTC)
thread_title:  ESR in capacitors 

message: An isolating transformer uses its ESR to limit current. I have never heard this one before. Does anyone have any references please before I alter this statement??--Light current 04:33, 20 September 2005 (UTC)
replies: text: There won't be a reference for that. A standard isolating transformer will have a low ESR to keep output voltage steady with load changes. On short circuit it will burn out unless protected by a fuse. Meggar 05:05, 20 September 2005 (UTC)

text: I suppose that the author may have been thinking about why an isolation transformer is used - to isolate the Earth reference from the chassis so that a fault current to Earth will be very small.  So, in this broad sense, you could say that the isolation transformer limits the fault current.  This, however has nothing to do with ESR. Alfred Centauri 13:14, 20 September 2005 (UTC)
thread_title:  Isolating transformer- is this statement really true?? 

message: I dont know about this one. Does hysteresis of a core affect coils esr?--Light current 21:12, 20 September 2005 (UTC)
replies: text: All practical inductors exhibit losses due to the resistance of the wire or absorption by materials within the magnetic field surrounding it. It is possible to model these losses as a resistance, R, in series with a perfect or loss free inductance L. - From Meggar 01:57, 21 September 2005 (UTC)
thread_title:  Is hysteresis reflected in increases esr for inductors? 

message: Page needs some serious work I feel. Coiuld do with a diagram or two and a bit more detail. Any offers?--Light current 15:07, 23 September 2005 (UTC)
replies: text: Adding diagrams and more detail is not "cleanup".  Gene Nygaard 15:58, 23 September 2005 (UTC)

text: No, it isn't (as I already pointed out in the case of "more details").  Tell me what is currently here and in need of cleanup.  If nothing, or nothing that cannot be easily fixed, go find the proper tag to add here and remove the cleanup tag, or I will. Gene Nygaard 17:01, 23 September 2005 (UTC)

text: I don't see any real problem with the tag; cleanup is just one factor affecting quality.  Gene Nygaard 19:50, 25 September 2005 (UTC)
replies: text: Usually this sort of request is what people use  for. "Cleanup" is generally used for remedial work - cleanup, as in what you do to a mess. -- Beland 03:20, 29 September 2005 (UTC)
thread_title:  Clean up 

message: There isnt really enough meat in this subject at the moment to sustain a separate article I feel. Any thoughts?--Light current 06:36, 25 September 2005 (UTC)
replies: text: Yes, the ESR is not the DC resistance. I did put up the entry about hysteresis and eddy current losses adding to the DC resistance. Do you see that small equivilent circuit in dashed lines under the quote in the above link? The one showing an equivilent resistor representing the sum of the various losses in series with an ideal inductor? Both coils and capacitors have ESR and Q ratings, the two are inseperable. A drawing could be added to expand this, but it is futile since there is also a merge tag. If you are intent on merging it there is no point in making it too big to fit back into the capacitor article. How about picking one of these incompatable tags and removing the other? Meggar 04:42, 27 September 2005 (UTC)

text: Here is a link to the .gif . Meggar 06:17, 10 October 2005 (UTC)

text: There are some here . ESR isn't a term, only an abbreviation. The full phrase is used for many things. ESR is also a common spec for quartz crystals. Meggar 03:00, 13 October 2005 (UTC)
thread_title:  Merge or redirect? 

message: OK heres what Ive got on this from Power Electronics 2nd ed, B.W. Williams, Macmillan, 1992
Because of core losses, a coil can be represented by
:a) a series Ls - Rs cct for inductors
:b) a parallel Rp,Lp cct for a transformer.
Core losses are modelled by including a resistance, and associated losses are accounted for by considering the core mu as a complex variable. mu bar.
Series equ cct of inductor:
:Z = Rs + jwLs = jw(mubar)cN^2 ohms
where mu(bar) = mu' - j mu =Ls/cN^2 - j Rs/wcN^2
For a transformer, the parallel eq cct is 
:1/Z = 1/Rp + 1/(jwLp)
So 1/mu = 1/mu' - 1/(jmu)
:= 1/(Lp/cN^2) - 1/(jRp/wcN^2)
:series and parallel ccts are eqivalent so:
musub s/u'sub s = mu'sub p/musub p = tan delta
where tan delta is the core loss factor
tan delta = Rs/wLs = WLp/Rp = 1/Q
So pick the bones out of that lot!
Notice that ESR is not mentioned but Q and tan delta are!!!
--Light current 08:51, 19 October 2005 (UTC)
thread_title:  Book quotation 

message: Artcle's external link links to various blogs and sites selling esr meters and low esr components rather than describing the technical aspects of esr. So I am deleting all the currents links and adding another one.R!j!n (talk) 10:01, 20 July 2013 (UTC)
thread_title: External links

message: Can we say that the quoted ESR of a battery is its internal resistance ? - Rod57 (talk) 20:50, 5 September 2018 (UTC)
replies: text: No. Internal resistance is |Z| (equivalent resistance) measured at 1 kHz. And ESR is measured at 100 kHz and it does not make much sense for batteries. 2A00:1370:8184:1765:72E6:8B99:A6F6:5EB0 (talk) 19:04, 11 November 2022 (UTC)
thread_title:  Battery ESR and internal resistance