Scope pics...

[Gerald Pelnar]

Your electrons are headed for a serious identity crisis.

I checked 3 books on the shelf here and all agreed:

AC if the curent goes one way for a while then turns and
goes the other way for a while.

DC if the current only goes in one direction. (one of them even
used the same example you did with the curent speeding up  and
slowing down. If it stays going in the same direction, it's DC)

Should I have check a couple more books?

Gerald
----- Original Message -----
From: steve ravet <sravet at arm.com>
To: <gmecm at diy-efi.org>
Sent: Tuesday, November 14, 2000 12:30 AM
Subject: Re: Scope pics...


>
>
> Bruce Plecan wrote:
>
> > So it goes from A/C to D/C just cause there is an air gap?.
> > That doesn't make sense to me.
>
> There's not much disagreement in this thread, except for terminology.
> AC may stand for alternating current, but what it really means is one
> that varies with time.  Any voltage that varies with time, even if the
> polarity never changes, is still AC.  Even a battery produces AC
> voltage, because if you measure it long enough it decays and approaches
> zero.  The voltage across a plug certainly varies with time and is
> therefore "AC".  It's not a bunch of DCs that all have a different
> value.
>
> >
> > Thus the current through the spark plug, which is only
> > > >during spark, is always going in the same direction.
>
> This is also true.  What the electrons are doing is the equivalent of
> you speeding up and slowing down between 55 and 65.  You never stop
> moving forward, only the rate of moving forward changes.  BUT, this is
> still AC, not DC.  The effect of the electrons changing velocity (radio
> hiss, etc.) is the same whether that change is centered on 0 or 15Kv.
>
> I think every post made in this thread has been basically correct, with
> the exception of the first one that claimed that spark voltage is DC.
> There have only been misunderstandings in terminology.  Plus, there's
> very little gmecm content here....
>
> >
> > Theory is fine, but when the real world doesn't support it, the theory
comes
> > into guestion in my book
>
> The "Hitchiker's Guide to the Galaxy" states conclusively "Any
> discrepancy between this Guide and reality are clearly the result of a
> defective reality".
>
> --steve
>
> --
> Steve Ravet
> steve.ravet at arm.com
> ARM,Inc.
> www.arm.com
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