Xref: utzoo sci.electronics:4261 rec.ham-radio:6860
Path: utzoo!utgpu!watmath!clyde!feg
From: feg@clyde.ATT.COM (Forrest Gehrke)
Newsgroups: sci.electronics,rec.ham-radio
Subject: Re: capacitance of batteries
Message-ID: <36385@clyde.ATT.COM>
Date: 14 Nov 88 14:27:10 GMT
References: <938@ccnysci.UUCP> <8810250344.AA02429@esplanade.csri.toronto.edu> <1988Nov13.001657.21990@utzoo.uucp>
Organization: AT&T Bell Labs, Whippany NJ
Lines: 24

In article <1988Nov13.001657.21990@utzoo.uucp>, henry@utzoo.uucp (Henry Spencer) writes:
> In article <1638@adec23.UUCP> mark@adec23.UUCP (Mark Salyzyn) writes:
> >Does any one know the capacitance of a 60Ah battery, or is it not possible
> >to measure it ?!:-)
> charge/voltage.  If we assume a car battery (12V), that's an 18 kF capacitor.
> 
> (Just to head it off...  Anyone who wants to argue about whether a battery
> is a capacitor should know that this was hashed out a couple of years ago.
> The obvious difference is the non-linearity of the battery, but many
> capacitors are detectably non-linear too.  Nonlinearity is normally felt
> to be a feature in batteries and a bug in capacitors, which is why the
> difference in degree.)






Why should anyone want to gainsay you, Henry?  One has only to
look at the output waveform of the rectified output of the
alternator with and without connection to the battery to be
convinced that a large capacitor is involved.

Forrest Gehrke k2bt