Re: ESR

["Malcolm Watts" <M.J.Watts-at-massey.ac.nz> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

On 24 Aug 00, at 11:30, Tesla list wrote:

> Original poster: "Dan Kunkel" <dankunkel-at-hotmail-dot-com> 
> 
> Tesla Enthusiasts,
> 
> I was looking through the Newark electroincs catalog and found some suitable 
> mmc caps. But they are described as low ESR. What does that mean? And as 
> long as I have your attention...what does 'wvdc' as opposed to 'vdc' 
> (obviously vdc means volts direct current) when refering to capacitors.

low ESR = good, good, good!  Effective Series Resistance is a 
frequency-dependent equivalent resistance model that 
encompasses all losses present in the component. It's a bit 
like (dare I say it) transmission lines: in that case you can 
represent the impedance you measure at a port using three 
lumped components.  
     WVDC is the rated maximum voltage for continuous usage. 
Its counterpart is Peak Voltage which allows for some 
transient voltage above this. 

Regards,
Malcolm