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From: Chuck Simmons
Organization: You jest.
X-Mailer: Mozilla 4.61 [en] (X11; U; Linux 2.0.33 i586)
Subject: Re: Microwave oven from 110V to 220V
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Date: Sat, 12 Oct 2002 13:15:45 GMT
NNTP-Posting-Date: Sat, 12 Oct 2002 06:15:45 PDT
Al Hephy wrote:
> Don't fight guys... Those 'power meters' actually measure current.
> During "brownouts" the power company screws you royally.
> Regards, Al
Well, chalk up another one who hasn't a clue about kilowatt hour meters
and how they work.
> Chuck Simmons wrote in message news:3DA775A1.E28B988B@webaccess.net...
> > Sam Goldwasser wrote:
> > >
> > > I guess I am missing your point because as far as I can tell, we agree on
> > > everything. All I am saying is that these power meters do not measure true
> > > power by some accident (violation of Murphy's law!), they were designed to
> > > work that way. It's very clever and as you say, economical. If a newly
> > > minted EE were asked to design a modern replacement, it would likely use
> > > voltage and current sensing, analog to digital conversion, a microprocessor
> > > to calculate power, and end up not being as accurate!
> > Very sorry. Several times in these groups I have seen statements to the
> > effect that kilowatt hour meters of traditional type do not indicate
> > true power but rather apparent power such as you would get with a
> > voltmeter and an ammeter. I incorrectly attributed this to you. You said
> > it right all along correcting some reference to a more rapidly spinning
> > meter or some such. I should read more carefully early in the morning.
> > And indeed the Ferraris type meter is very clever being an integrating
> > true power meter of very simple construction. One of its virtues in some
> > power systems is that it is reversible - that is, it "knows" which
> > direction power is going.
> > Chuck
... The times have been,
That, when the brains were out,
the man would die. ... Macbeth
Chuck Simmons email@example.com
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