>
>
> >I routinely use the following question to test candidates for EE or TE
> > positions. For many years, it continues to stump all but one of many.
> > Is it really that difficult to solve?
>
> >
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> > or
>
> >
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> > I see two ways to solve it. The preferred method is to use Ohm's law
> > and nodal analysis without regard to the value of +VDC. Another method
> > is to assign a value to +VDC and solve it that way; I find that method
> > lame. Is this question, or test, too challenging for a BSEE graduate?
>
> > For entertainment only, I invite any of you to provide the solution
> > using only nodal analysis without consideration of the value of +VDC
> > (showing or explaining your work). There are bonus points that have no
> > value for calculating the exact equivalent resistance.
>
> > Thanks,
> > Brian
>
> 4 * 40 ohms =3D 160 !! 4 kohms
It really is that simple, isn't it? My frustration that prompted my post is that recent BSEE graduates don't seem to be able to answer this question.