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Article #152Re: Best way to power array of LEDs?
From: Bob Wilson
Date: Tue, 05 Nov 2002 03:41
Date: Tue, 05 Nov 2002 03:41
36 lines
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3224 bytes
In article <J_xx9.45419$Mb3.2215008@bgtnsc04-news.ops.worldnet.att.net>, please-no.spam.tdnews@att.net says... > >"Sofie" <sofie@olypen.com> wrote in >message news:us7t1tk9t9t795@corp.supernews.com... >> At that rate, you could hook up 100 LEDs and pull about 2 Amps..... >roughly >> the same amount as a brake or tail-light...... and the heat and wasted >power >> from the resistors will still be negligible..... and would not affect >your >> gas mileage..... or I suppose a single drop of gasoline in several >> tank-fulls should take care of the extra power used. > >That reminds me of a question that has crossed my mind. When I turn on >the car radio, am I burning more gas, or just dissipating less heat in >the engine electronics and more in the radio? > > 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! Bottom line: you don't get something for nothing. Bob.
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 112d1e,4ef4c9d4aea85e1f X-Google-Attributes: gid112d1e,public X-Google-Thread: 1118be,4ef4c9d4aea85e1f X-Google-Attributes: gid1118be,public X-Google-Thread: 103407,4ef4c9d4aea85e1f X-Google-Attributes: gid103407,public X-Google-Thread: 10d137,4ef4c9d4aea85e1f X-Google-Attributes: gid10d137,public X-Google-Thread: 1131b0,4ef4c9d4aea85e1f X-Google-Attributes: gid1131b0,public X-Google-ArrivalTime: 2002-11-04 19:45:52 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!newsfeed-west.nntpserver.com!hub1.meganetnews.com!nntpserver.com!telocity-west!TELOCITY!sn-xit-03!sn-xit-06!sn-post-01!supernews.com!corp.supernews.com!not-for-mail From: rfwilson@intergate.nospam.bc.ca (Bob Wilson) Newsgroups: sci.electronics.components,sci.electronics.design,alt.engineering.electrical,aus.electronics,sci.electronics.repair Subject: Re: Best way to power array of LEDs? Date: Tue, 05 Nov 2002 03:41:33 -0000 Organization: Your Organization Message-ID: <useffdcqh8hne7@corp.supernews.com> X-Trace-PostClient-IP: 216.113.216.96 X-Newsreader: WinVN 0.99.9 (Released Version) (x86 32bit) 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> MIME-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Complaints-To: abuse@supernews.com Lines: 37