Richard Clark wrote in message . ..
On 14 Jan 2004 03:13:25 GMT, oUsama (Yuri Blanarovich)
wrote:

How come that
straight piece of wire (as antenna) can exhibit different current along its
length (where is Kirchoff)

Sheesh²,

Kirchhoff is explicitly violated by employing his laws at wavelength
scales. Kirchhoff NEVER said anything about current into/out-of a
device (which by necessity is of some obvious dimension). Rather, his
current law speaks of a POINT (which is dimensionless). In failing to
have come to terms with this simple issue, the entire course of, what,
600 postings yields little more than white noise.

If you want to talk Kirchhoff and nets, get your definitions right.
It is his voltage law that describes in terms of devices (across a
resistor, between two points, what have you).


73's
Richard Clark, KB7QHC


Check out this gentlemen:

http://www.scientia.org/cadonline/Ph.../kirchoffq.ASP

Yeah, it's very simple, isn't it? But if you consider that
dQ/dt=I AT A SPECIFIC POINT, then it's all about conserving Coulombs,
it seems to me.

Kirchoff's current law applies when you have a junction between
multiple current-carrying paths, and it applies more to a DC current
situation.

The law isn't violated when you consider the AC current running
through
a capacitor, otherwise you would demand that there be a current
running through the dielectric, which there is clearly not (the
coulombs never travel across it). Likewise, an antenna can store
coulombs, more at the ends of the radials, and can therefore have a
different AC current distribution at the different
points on the antenna.

So Kirchoff's law stands the test of conserving coulombs, but is
easier
to understand in a DC situation.


Slick