Return-Path: Received: (qmail 7122 invoked from network); 11 Nov 2002 13:21:15 -0000 Received: from warrior.services.quay.plus.net (212.159.14.227) by mailstore with SMTP; 11 Nov 2002 13:21:15 -0000 Content-Transfer-Encoding: 8bit Received: (qmail 11282 invoked from network); 11 Nov 2002 13:20:47 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from post.thorcom.com (193.82.116.70) by warrior.services.quay.plus.net with SMTP; 11 Nov 2002 13:20:47 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.10) id 18BEUF-00066h-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 11 Nov 2002 13:20:19 +0000 Received: from [147.197.200.9] (helo=hestia.herts.ac.uk) by post.thorcom.com with esmtp (Exim 4.10) id 18BEUF-00066Y-00 for rsgb_lf_group@blacksheep.org; Mon, 11 Nov 2002 13:20:19 +0000 Received: from gemini ([147.197.200.44] helo=gemini.herts.ac.uk) by hestia.herts.ac.uk with esmtp (Exim 3.22 #1) id 18BCRV-00049A-00 for rsgb_lf_group@blacksheep.org; Mon, 11 Nov 2002 11:09:21 +0000 Received: from [147.197.232.252] (helo=rsch-15.herts.ac.uk) by gemini.herts.ac.uk with esmtp (Exim 3.33 #1) id 18BCRT-0005YQ-00 for rsgb_lf_group@blacksheep.org; Mon, 11 Nov 2002 11:09:19 +0000 Message-ID: <5.1.0.14.0.20021111105730.00aed178@gemini.herts.ac.uk> X-Sender: mj9ar@gemini.herts.ac.uk X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Mon, 11 Nov 2002 11:08:22 +0000 To: rsgb_lf_group@blacksheep.org From: "James Moritz" In-reply-to: <7D653C9C42F5D411A27C00508BF8803DCB9CCB@mail.dstl.gov.uk> MIME-Version: 1.0 X-MailScanner: No Virus detected Subject: Re: LF: A puzzle for Monday Content-Type: text/plain; charset=us-ascii; format=flowed X-Spam-Status: No, hits=-0.6 required=5.0tests=DEAR_SOMEBODY,IN_REP_TO,SPAM_PHRASE_00_01,SUBJECT_FREQversion=2.42 Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Dear Andy, LF Group At 08:46 11/11/2002 +0000, you wrote: >You then conclude the internal circuit is >either a Thevenin source (an ideal 1V voltage source with a 1-ohm series >resistor) or a Norton source (an ideal 1A current source with a 1-ohm >shunt resistor). Using standard laboratory equipment, how could you >determine which one it is. > Well, it's hard to be certain, but if the box has a label on the back which says something like "use 275,000 AA cells - observe correct polarity", then it is probably the Norton current source one... Cheers, Jim Moritz 73 de M0BMU