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Old 26th July 2016, 09:46 PM   #1
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Default 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? )
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Old 26th July 2016, 09:50 PM   #2
tomchr is offline tomchr  Canada
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1.602E-19 C is the elementary charge, q. I use that all the time for noise calculations.

Tom
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Old 27th July 2016, 11:44 AM   #3
DF96 is offline DF96  England
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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.
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Old 29th July 2016, 06:50 AM   #4
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I thought it was going to be How many engineers .... does it take to change a light bulb.....
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Old 29th July 2016, 06:53 AM   #5
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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...
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Last edited by picowallspeaker; 29th July 2016 at 06:57 AM.
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Old 2nd August 2016, 07:09 PM   #6
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Quote:
Originally Posted by PeteMcK View Post
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.
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Old 3rd August 2016, 10:32 PM   #7
chrisb is offline chrisb  Canada
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wouldn't that be "how many psychiatrists.."?
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Old 3rd August 2016, 11:27 PM   #8
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No, those are the advisory committee members.
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Old 3rd August 2016, 11:43 PM   #9
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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.
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Old 4th August 2016, 06:42 AM   #10
chrisb is offline chrisb  Canada
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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
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