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Article #154Re: Best way to power array of LEDs?
From: Tom Del Rosso
Date: Tue, 05 Nov 2002 05:35
Date: Tue, 05 Nov 2002 05:35
39 lines
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3569 bytes
"Bob Wilson" <rfwilson@intergate.nospam.bc.ca> wrote in message news:useffdcqh8hne7@corp.supernews.com... > > Turning on the radio does not magically make the engine more efficient so > clearly what you are doing is to add load to the alternator (in order to > power the radio), and hence you the engine has to work a little harder (and > consume more gas) to do the extra work. > > What if your alternator was capable of somehow outputting a megawatt? > Suddenly switching on a load that is using FAR more energy than it takes to > drive the car, would be an extreme example of this. If the answer to your > question was that you are dissipating less heat and burning no more gas, > then your engine would be running so efficiently that it would be getting > very cold, VERY fast! If the alternator could supply a megawatt, then I'd expect it to be a bigger mechanical load than the drive train even with no electrical load. When *less* current is drawn, does that mechanical load change proportionately, or does the alternator, to some extent at least, convert some of its unused capacity to more internal heat? > Bottom line: you don't get something for nothing. Well I wasn't thinking of getting something for nothing. I was thinking that it sounds too ideal for an increased load on the alternator to convert into an exactly proportionate load increase on the engine. If I draw less power than the alternator can supply, isn't it just wasting some of that power because of the non-ideal properties of the alternator? In other words does a generator precisely convert a higher load current into more mechanical resistance?
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 112d1e,4ef4c9d4aea85e1f X-Google-Attributes: gid112d1e,public X-Google-Thread: 10d137,4ef4c9d4aea85e1f X-Google-Attributes: gid10d137,public X-Google-Thread: 1118be,4ef4c9d4aea85e1f X-Google-Attributes: gid1118be,public X-Google-Thread: 1131b0,4ef4c9d4aea85e1f X-Google-Attributes: gid1131b0,public X-Google-Thread: 103407,4ef4c9d4aea85e1f X-Google-Attributes: gid103407,public X-Google-ArrivalTime: 2002-11-04 21:35:23 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!logbridge.uoregon.edu!feed2.news.rcn.net!rcn!wn11feed!worldnet.att.net!bgtnsc04-news.ops.worldnet.att.net.POSTED!not-for-mail From: "Tom Del Rosso" <please-no.spam.tdnews@att.net> Newsgroups: sci.electronics.components,sci.electronics.design,alt.engineering.electrical,aus.electronics,sci.electronics.repair References: <0001HW.B9C26E7400A7161B165FEAC0@news.covad.net> <Rsan9.14070$qh1.1622310@news.ca.inter.net> <ank9ep$lumv$1@hades.csu.net> <anku2n$5so$1@news.wave.co.nz> <7tGLdeAS6fn9EwBv@jmwa.demon.co.uk> <apvlvu$n2c$1@reader1.panix.com> <aq0h2t$nv1$1@thorium.cix.co.uk> <us7t1tk9t9t795@corp.supernews.com> <J_xx9.45419$Mb3.2215008@bgtnsc04-news.ops.worldnet.att.net> <useffdcqh8hne7@corp.supernews.com> Subject: Re: Best way to power array of LEDs? Lines: 41 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 Message-ID: <uMIx9.46613$Mb3.2298793@bgtnsc04-news.ops.worldnet.att.net> NNTP-Posting-Host: 1ad0dbb51fade4b792443e404a40827a X-Complaints-To: abuse@worldnet.att.net X-Trace: bgtnsc04-news.ops.worldnet.att.net 1036474522 1ad0dbb51fade4b792443e404a40827a (Tue, 05 Nov 2002 05:35:22 GMT) NNTP-Posting-Date: Tue, 05 Nov 2002 05:35:22 GMT Organization: AT&T Worldnet Date: Tue, 05 Nov 2002 05:35:22 GMT