Re: Creating a folder on the desktop
Re: Creating a folder on the desktop
- Subject: Re: Creating a folder on the desktop
- From: "John C. Welch" <email@hidden>
- Date: Tue, 06 Sep 2005 23:32:11 -0500
- Thread-topic: Creating a folder on the desktop
On 9/6/05 22:36, "Bill Briggs" <email@hidden> wrote:
>> The US Navy teaches negative to positive.
>
> I've got maybe a hundred EE texts on my office shelf, and not a single one
> has this convention you mention. Not electronics, not circuit analysis, not
> networks, not transmission lines, nothing. I only teach it, I don't pretend to
> understand it. But I'm more inclined to believe that you are recalling
> incorrectly than that the US Navy teaches something that is opposite of the
> convention of the discipline (mission accomplished). If you can offer proof,
> go for it. I'll bring the IEEE in to back up my case.
I'm not saying you're wrong. I'm saying that the Navy taught "hole flow", at
least in the late 80s, early 90s. Since that's straight from someone who
taught basic electronics FOR the navy, I see no reason to think they were
lying. He never went into why, just that the navy did things differently.
>
>
>> When I was in school in the US Air Force, I learned it all heads for the
>> ground, however that happens to be defined in the circuit
>
> And that's a totally bone headed notion. Ground is a reference point for
> electrical potential and has nothing to say about the direction that current
> is headed in a given circuit. My first year students have problems with this
> too, but they learn and grow out of it by second year. And they don't argue
> about it after that, because there's no argument. If you knew what a Hall
> effect sensor was you would know immediately that the above statement was a
> crock as it can be so easily disproved using said sensor. The fact is that any
> circuit will have current flow in the same direction no matter what single
> point in the circuit you happen to ground. Again, I'm totally inclined to
> question your memory rather than to abandon the conventions of Physics and
> Electrical Engineering. "A little knowledge is a dangerous thing, drink deeply
> or not at all." I comment, you decide. If I were you I'd do some careful
> research before arguing this further. You're in my bread and butter now John,
> and you need to know that I'm not just giving opinion or faint memories of
> courses of the past. The established direction of current flow is from the
> anode (positive terminal) to the cathode (negative terminal) and there's
> nothing debatable about it. If you make an honest effort to look into it,
> you'll satisfy yourself that this is the case.
Again Bill, you're mistaking "This is what they did" with "This is the
correct way for every situation". I'm not saying they taught it the best
way. I'm saying, and with absolute certainty, that when we traced current
through circuits, they taught us to find the damned ground or most grounded
point, (airplanes here, so 'ground' and 'earth' are shall we say, sometimes
a tad virtual compared to a building) and that was how the damned current
went. Were they perhaps oversimplifying things in the interest of speed?
Probably. They had between 9.5 months to 11.5 months to get us from absolute
zero to being able to build shit by hand if we had to. Taking 4-8 years
wasn't an option.
I was in that program for 6 hours a day for a *year*. Really. Six hours. 5
days a week. No summer break. No spring break. A handful of holidays. I can
give you an exact count on the hours if you like, I still have the
certificates. My memory's on REAL firm ground here. It's not just a faint
memory. Spending 40 hours a week learning how every single circuit works in
an AN/ALQ-119A ECM Pod works, tracing every.single.connection, RF and
Electrical in it, for every possible power state, then taking the thing
apart and putting it back together has a way of embedding itself in your
memory. Same thing for a B-1B. All 170 or so LRUs on it. IEEE STP bus system
for power control. I can probably still find every friggin' load that
affected our systems, and show you the locations of the ACL/ICL/LCL breakers
for the coolant systems on a B-1B and which had to be pulled for engine runs
vs. ground power/APU runs. If you want to arrange it, I can probably walk
under the wing glove area still and tell you what boxes are in what panel,
and how many it takes to stop a full-grown Canadian Goose traveling at a
relative speed of just over Mach 1. I can also tell you that if they're
testing the HF system on that pig, you don't want to be within 5' of the
skin of that aircraft unless you like waking up 30' from where you were
standing, and sore as hell. I spent almost 6 years doing that 40 hours a
week, sometimes more. No spring break. No summer break.
You want to tell me that the way the were teaching it was utter crap, okay,
I'm not arguing, you're FAR better qualified to tell me that than most folks
I know. But if you want to tell me that they didn't teach it that way at
all, and I'll tell you you're wrong, pure and simple.
--
"You question the worthiness of my code? I should kill you where you
stand!"
- 2nd most commonly uttered Klingon programmer phrase
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