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Thread: can someone explain this to me?
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12-04-2011, 12:37 AM #1
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can someone explain this to me?
formula-1.jpgwhere Po, i is the output power of the ith output.
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12-04-2011, 01:05 AM #2
The Spaminator
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what kind of formula is that?
Originally Posted by Cody_Irwin
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12-04-2011, 01:54 AM #3
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It's for power efficiency. and the one I need a definition for is
Σ
I know this is sigma but what is it used for in this equation? what value gets inserted there?
I've got most of the rest figured out as far as n being the effeciency, Po, i is the output on the i th bus p in is power in. but I can't get a lock on that sigma thing. (think anyone will guess that math isn't my strong point?) and by the way, is this considered algebra? or am I moving into unkown (by me) territories?The path to universal understanding starts here: Say what you mean, and mean what you say.
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12-04-2011, 07:32 AM #4
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That is advanced Algebra I believe. Makes my head hurt looking at it this late. Can't recall the symbol either.
Last edited by Saryn; 12-04-2011 at 07:35 AM.
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12-04-2011, 07:38 AM #5
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http://en.wikipedia.org/wiki/Summation
Try that link. Might help you figure it out better than I can atm :P
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12-04-2011, 08:58 AM #6
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I guess my mom was right about me needing it one day.... shoulda paid more attention in school. at least now i have a better starting point. I'll look at it again in the morning.
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12-04-2011, 07:51 PM #7
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In case you need some more help, looks to me like what it says is: Sum all the outputs, divide by the input and multiply by 100.
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12-04-2011, 08:42 PM #8
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Great, now I just have to figure out how to get the values for the output. do they make a kill-a-watt for the dc side of a PSU?
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