Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: notesfiles - hp 1.2 08/01/83; site hp-pcd.UUCP 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