[sdiy] A little OT, Begging a hand

[Ian Fritz]

At 04:04 PM 2/8/2011, Veronica Merryfield wrote:

>On 2011-02-08, at 2:48 PM, Ian Fritz wrote:
>
> > At 03:03 PM 2/8/2011, David G. Dixon wrote:
> >
> > Oh, and I only see three nodes.  (The output point isn't a node, at 
> least not in my way of thinking, because there is no current into the 
> output terminal.  The current thru R8 is the same as that coming out of 
> the node immediately to its left, ie thru R1-was-R6. V0 - V3 is given by 
> that current times R8.)
> >
> > But my delta-wye argument is much more elegant.
>
>The output becomes a node if V1 or V2 are set OC. I think as Tim pointed 
>out that this changes the circuit and therefore the equations.

I disagree.  V0 is determined solely by the current running through the 
series combination R6 R8.  It is not a variable of the system, because it 
is not an applied voltage.  It is measured by a high impedance meter and 
the meter draws no current.  It is not a node, it's just a measurement 
terminal.






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