From: amdx@knology.net   
      
   On 6/19/2014 2:18 PM, John Fields wrote:   
   > On Thu, 19 Jun 2014 17:19:00 +0000 (UTC), Cydrome Leader   
   >  wrote:   
   >   
   >> Maynard A. Philbrook Jr.  wrote:   
   >>> In article ,   
   >>> jfields@austininstruments.com says...   
   >>>> The resistance of a capacitor is an entirely different thing, and   
   >>>> amounts to the leakage current measured through the dielectric with   
   >>>> a voltage across it.   
   >>>>   
   >>>> In terms of goodness, the lower the ESR and the higher the   
   >>>> resistance the better.   
   >>>>   
   >>>> John Fields   
   >>>>   
   >>> Could you please clarify that a bit? I am only an   
   >>> inbred from Maine and I did quite get that one.   
   >> If you take an electronic device, even something simple like a battery   
   >> there are still losses inside the device from the wiring, connections and   
   >> other electrochemical stuff going on inside the device.   
   >>   
   >> Those internal losses are what's called ESR. For instance, if you short   
   >> out a AAA battery you will get less current than if you short out a D   
   >> cell, even though both can in theory output 1.5V. The D cell has beefier   
   >> internal construction and offers a lower internal resistance, so more   
   >> current can be drawn from it.   
   >>   
   >> The tricky part is a battery, (or capacitor or anything really) is not a   
   >> plain resistor, so you can't measure this "equivalent" value with an ohm   
   >> meter, but if you could, the result would be the ESR.   
   >>   
   >> In capacitors, you generally want the lowest possible ESR. A cap with a   
   >> high ESR is old, failing, cheap or just junk, and it can potentially heat   
   >> up during use, just like a resistor. Heat makes electrolytic capacitors   
   >> dry up, which increased the ESR, which make them heat up more, until they   
   >> explore or just stop being capacitors.   
   > ---   
   > Right.   
   >   
   > They turn into explorers. ;)   
   >   
   > John Fields   
      
      The third picture (schematic) has a slightly simplified schematic of   
   a capacitor with it's ESR, leakage and inductance.   
      
   > https://www.designworldonline.com/basics-of-tantalum-electrolytic-capacitors/   
     I think this may help you understand, and why, each must be measured   
   differently.   
      
                                      Mikek   
      
      
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