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Path: utzoo!watmath!clyde!cbosgd!ihnp4!mhuxn!mhuxr!ulysses!allegra!oliveb!hplabs!hp-pcd!john
From: john@hp-pcd.UUCP (john)
Newsgroups: net.misc
Subject: Re: Newman's Energy Machine (2)
Message-ID: <6400036@hp-pcd.UUCP>
Date: Sun, 27-Oct-85 22:26:00 EST
Article-I.D.: hp-pcd.6400036
Posted: Sun Oct 27 22:26:00 1985
Date-Received: Wed, 30-Oct-85 07:07:39 EST
References: <175@tulane.UUCP>
Organization: Hewlett-Packard - Corvallis, OR
Lines: 22
Nf-ID: #R:tulane:-17500:hp-pcd:6400036:000:1043
Nf-From: hp-pcd!john    Oct 27 19:26:00 1985

<<<<<
<
< For this demonstration, it does not appear to me sufficient to measure only
< the voltages involved.  Voltage, current, and the phase between them should
< all be measured in order to accurately monitor the power going in and coming
< out. Phase measurements can be omitted if the electrical power is guaranteed
< to be DC.
<

One thing you do not want to do (unless your trying to trick someone) is to
measure the battery current with a DC multimeter. That only works if the load
is a steady DC load. If the load is a "pulsed" load that draws current for
only a fraction of a cycle then the indicated reading will be less than the
true average current. It has to do with the mechanical inertia of the meter
movement and is the same reason why your audio meters don't indicate properly
for very loud and quick tones. If you design a device to draw current in very
short pulses that are properly spaced then a input current meter will report
that you are using a lot less power than you really are.


John Eaton
!hplabs!hp-pcd!john