w_tom said:
Maybe you could explain to other engineers that no current
I could explain it to you, if you ask. I don't know that I need to explain
it to any engineers. They probably know how it actually works, and, if they
like, they'll use a concept of displacement current in their capacitor-type
reckonings if there is any need and it is appropriate and suitable.
flows through a capacitor. I am sure they would be quite
surprised.
I'm not so sure as you are.
Capacitors have two wires for good reason -
electric current flow - an incoming and outgoing path. Other
two wire devices are resistors and inductors. Those too
conduct electricity only when both the incoming and outgoing
paths are in a circuit.
To me, the capacitor discussion is an irrelevant distraction
to the original posted question.
It was a relevant distraction, for the purpose of showing you your concepts
fail in certain cases. Since you were hanging onto them, and using them as
basis to counter stuff I put forth, it was unfortunately a necessary
distraction.
If you have a problem with
the concept, then ask someone else. Meantime, if no current
flows through control circuits - and that means both incoming
and outgoing circuit path must exist - then the control
circuitry is not adversely affected. To have electricity flow
through and interfere with control circuitry, then first a
complete circuit - an incoming and outgoing path - must exist.
There are ramifications of these assertions. They seem to be based on an
assumption that it is impossible for charge to accumulate anywhere in the
universe at any time, and seem to imply that capacitors do not work, nor
antennas, for starters.
I was going to show you that your concept "need a complete circuit for
current flow" fails in certain situations. It's an assumption we make when
appropriate, but set aside when not appropriate. You believe in it too
strongly, and, in fact, I see you have attempted to redefine 'electricity'
and 'current' and gone to other lengths to avoid having to consider that
possibility. You could have learned something here, and come out ahead OR
by presenting valid counter arguments to me you could have helped me to
learn while sharpening up your own processes. If I recall correctly, you
had strong opinions about lightning and its effects and side effects.Someone
was askng about a laptop, and, I believe, there was discussion of the type
of material a table was made of. I don't recall well, but I thought at the
time you had made some valid point(s). How do you figure all that charge
builds up in clouds, if there must be charge flowing back out, as soon as
any charge flows into a cloud region? We have to be careful when
rhuminating on the topic of eletrical goings-on, because our hidden and
implicit assumptions sometimes do not hold.
As an example, are you familiar with the problem of feeding motors with high
frequeny PWM speed drives, via longish conductor runs? All the usual
circuit analysis does not reveal any problem with the setup, yet too many
motors fail. When one looks at it from travelling and reflected waves
(whose root is the solution of time domain distributed parameter systems),
one can explain how a problem occurs. One can, in fact explain the noisy
jangly mess which can by recorded by oscilloscopes. But one doesn't get
these results by just applying Ohm and Kirchhoff, the normal duo, with the
normal methods.