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 26th July 2016, 08:46 PM #1 diyAudio Member   Join Date: Jun 2008 How many engineers . . . . . . . . . After a pretty much continuous series of challenges involving things I know but didn't occur to me to think about I decided to pull out that dusty circuit analysis textbook and get to work. Reading Chapter 2 last night brought the question: Do any EE's (here) actually use the Coulomb in any of their figurings? (or do any of you even remember how many electrons are supposed to be in one? )
 26th July 2016, 08:50 PM #2 diyAudio Member     Join Date: Feb 2009 Location: Calgary 1.602E-19 C is the elementary charge, q. I use that all the time for noise calculations. Tom __________________ Modulus-86: 40W/8Ω @ 0.000061% THD. HP-1: 3W/20Ω, 450mW/300Ω @ 0.000032% THD. DG300B and Other Tube Circuits. Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right
 27th July 2016, 10:44 AM #3 diyAudio Member   Join Date: May 2007 I cross the boundary between EE and physics. 1.6 10^(-19)C is etched in my brain, so that means there are about 6 10^18 electrons missing to make a coulomb. If you need to think about genuine shot noise or partition noise then you will remember that number. Also, if you want to calculate the ripple in a normal cap input PSU you need to think about coulombs and the definition of capacitance and the definition of current. So yes, EEs use coulombs all the time.
 29th July 2016, 05:50 AM #4 diyAudio Member   Join Date: Feb 2002 Location: Western Sydney I thought it was going to be How many engineers .... does it take to change a light bulb..... __________________ Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
 29th July 2016, 05:53 AM #5 diyAudio Member     Join Date: Apr 2007 I use Horse Power but it's me and I'm not an EE or ME ... BTW yesterday I saw a western movie ( Man of the west ) so I'm a little fascinated... __________________ Everything under and above heaven is in utter chaos Last edited by picowallspeaker; 29th July 2016 at 05:57 AM.
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Join Date: Dec 2009
Location: Newnan GA
Quote:
 Originally Posted by PeteMcK I thought it was going to be How many engineers .... does it take to change a light bulb.....
The bulb has to want to change first then we can calculate the number.

 3rd August 2016, 09:32 PM #7 diyAudio Member   Join Date: Aug 2002 Location: victoria BC wouldn't that be "how many psychiatrists.."? __________________ on hiatus
 3rd August 2016, 10:27 PM #8 diyAudio Member     Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao No, those are the advisory committee members. __________________ It doesn't count how one deals with winning, but how to handle a loss (© DjT) https://www.youtube.com/watch?v=FJEzEDMqXQQ
 3rd August 2016, 10:43 PM #9 diyAudio Member   Join Date: Mar 2012 Location: Melbourne Although I have an EE degree (1983) I have worked for a bank since 1994. So not much use for Coulombs where I work. I don't even use Ohms Law.
 4th August 2016, 05:42 AM #10 diyAudio Member   Join Date: Aug 2002 Location: victoria BC Or a derivation on Hoffman's Iron Law? Pick any two: Large total dollar amount; Low denomination, random serial number currency for smaller footprint; Fits conveniently in your briefcase __________________ on hiatus

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