A variation of Kirchhoff's law is the Millman's law.
Unfortunately is not very well described here:
http://en.wikipedia.org/wiki/Millman%27s_Theorem
Millman's law can be applied for determining the voltage on a node
where two resistors are connected together, while two different
voltage sources are connected on the other end of the resistors. If
you wish it's about a node where the Kirchhoffs current law can't be
applied "ad literam" because the voltmeter connected in the node is
ideal.
So the sum of the currents flowing in the node is not equal with a
current flowing from the node somewhere else.


On 4/2/07, Anand Gadiyar <gadiyar@ieee.org> wrote:
> Hi all,
>
>    I noticed something interesting while playing around with a
> GAL16V8 device. I finally figured it out, but it's an interesting
> puzzle and I thought it worth sharing.
>
>   Using a voltmeter, the Vcc pin shows 5 volts with respect to GND.
> And a output pin at logic high shows 4 volts with respect to GND. The
> same pin shows 0 volts with respect to the Vcc pin. The same is
> observed when i used a CRO to look at the waveforms.
>
>   Also tried this on a PALCE22V10 device and it behaves similarly.
>
>   See if you can figure it out. I'm pretty sure you guys will throw
> more light on the puzzle, else answers in two days.
>
> Warm regards,
> Anand
>
> __________________________
> Anand Gadiyar
> Indian Institute of Science,
> Bangalore - 560 012
> __________________________
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