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From: Sam Goldwasser
Subject: Re: Microwave oven from 110V to 220V
Date: 11 Oct 2002 14:17:34 -0400
Organization: University of Pennsylvania
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Chuck Simmons writes:
> Sam Goldwasser wrote:
> > firstname.lastname@example.org (Ed Beroset) writes:
> > > FWIW, newer electronic meters can and do measure power factor, so
> > > while the simple electromechanical meters typically used in
> > > residential applications won't be affected, electronic meters are able
> > > to measure PF and some utilities charge based on PF -- typically not a
> > > consideration for residential user, howewver.
> > I believe it's the law in the U.S. that power meters must measure true power
> > for residential customers. The old power meters don't measure true power
> > because of some inability to do so, they were (very cleverly) designed that
> > way. :)
> How old? The customer meters in use by most utilities in the US for more
> than 50 years have measured true power-hours. In fact, exactly the same
> type of meter is in use today. If I remember correctly, it has a voltage
> coil, a current coil and an aluminum disk that rotates due to fields
> from eddy currents induced in the aluminum disk. I studied this sort of
> meter in high school in the late 1950s.
Exactly. By old I just meant not the fancy electronic ones being referred
to in the prior post.
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