From owner-freebsd-questions@FreeBSD.ORG Wed Jun 9 07:25:54 2004 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id B068B16A4CE for ; Wed, 9 Jun 2004 07:25:54 +0000 (GMT) Received: from mail.r.caley.org.uk (82-41-211-19.cable.ubr12.edin.blueyonder.co.uk [82.41.211.19]) by mx1.FreeBSD.org (Postfix) with ESMTP id E473B43D2D for ; Wed, 9 Jun 2004 07:25:53 +0000 (GMT) (envelope-from rjc@caley.org.uk) Received: from pele.r.caley.org.uk (pele.r.caley.org.uk [10.0.0.12]) by mail.r.caley.org.uk (8.12.6/8.12.6) with ESMTP id i597Op32015009; Wed, 9 Jun 2004 08:24:51 +0100 (BST) (envelope-from rjc@caley.org.uk) Received: from pele.r.caley.org.uk (localhost [127.0.0.1]) by pele.r.caley.org.uk (8.12.9/8.12.9) with ESMTP id i597OnFm014184; Wed, 9 Jun 2004 08:24:50 +0100 (BST) (envelope-from rjc@bast.r.caley.org.uk) Received: (from rjc@localhost) by pele.r.caley.org.uk (8.12.9/8.12.9/Submit) id i597Om36014181; Wed, 9 Jun 2004 08:24:48 +0100 (BST) (envelope-from rjc@bast.r.caley.org.uk) X-Authentication-Warning: pele.r.caley.org.uk: rjc set sender to rjc@bast.r.caley.org.uk using -f Sender: rjc@caley.org.uk To: Charles Swiger References: <20040608122101.GA68204@dogma.freebsd-uk.eu.org> <87zn7ednwg.fsf@pele.r.caley.org.uk> <20040608172756.GA70798@dogma.freebsd-uk.eu.org> <20040608135903.024729b8.wmoran@potentialtech.com> <6CCB3AEC-B97C-11D8-8148-003065ABFD92@mac.com> <40C62A70.8060102@bah.homeip.net> <3F7DF4CB-B993-11D8-8148-003065ABFD92@mac.com> From: Richard Caley In-Reply-To: <3F7DF4CB-B993-11D8-8148-003065ABFD92@mac.com> Date: 09 Jun 2004 08:24:48 +0100 Message-ID: <87brjtdwhr.fsf@pele.r.caley.org.uk> Lines: 29 User-Agent: Gnus/5.0808 (Gnus v5.8.8) XEmacs/21.1 (Cuyahoga Valley) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii cc: freebsd questions cc: "Bernt. H" Subject: Re: [OT] Re: Leaving a server on all day X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 09 Jun 2004 07:25:54 -0000 In article <3F7DF4CB-B993-11D8-8148-003065ABFD92@mac.com>, Charles Swiger (cs) writes: cs> You are correct that one needs to measure the voltage and use the RMS cs> value, or DC series equivalent if you like that phrase, in order to cs> figure out the power consumption accurately, but an {ammeter, cs> amp-meter, DMM} which can deal with AC will do the right thing. [from the we don't need no steeeeenking test equipment dept.] When I did this kind of thing a few years ago (trying to get a measure for things like the washing machine heating water and the kettle etc as well as PCs) I did it by watching the electricity meter. The one I had at the time had a big rotating disk with ticks marked on it counting off load as well as the dials recording larger units (can't easily see the current one to check this is a normal feature). I turned off everything I could in the flat, then turned various things on and counted off ticks per minute. I assumed that the electricity company was trying to do a reasonably good job to get as much money as possible without getting caught cheating, and in any case I was worried about money not the environment, so whatever they were measuring was the right metric, even if they were wrong scientifically. -- Mail me as MYFIRSTNAME@MYLASTNAME.org.uk _O_ |<