Re: Unknown resistor solving

"wombat" <wombat@xxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:44e3227b$0$15867$4fafbaef@xxxxxxxxxxxxxxxxxxxxxx
Greg Neill wrote:

"wombat" <wombat@xxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:44e2fa3e$0$30248$4fafbaef@xxxxxxxxxxxxxxxxxxxxxx

Hi All,

I've got this unusual resistor network as shown below. Only the
resistors prefixed by the '?' are unknown. All the voltages are known.
From summing currents at the nodes I arrive at 2 equations and 3
unknowns. Is this correct or is there some other way of ding it?

Cheers,
wombat

R1 Va ?R4
Vr o--/\/\/\/\--+---o----+-/\/\/\/\-+
| | |
/ \ |
\ / |
R3 / \ ?R6 |Vm
\ / |
/ \ |
\ / |
| | |
Vs o--/\/\/\/\--+---o----+-/\/\/\/\-+
R2 Vb ?R5


If Vm is an open-circuit voltage, then R4 and R5 can
take on any values. Vm will be equal to Va-Vb.


It's probably just my poor drawing but Vm is actually a fixed, known
voltage.

Then you should have indicated a voltage source, not a
measurement.

How about Vr and Vs? Are they also fixed by voltage sources?

.

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