Calculating Equivalent Resistance in a Hexagonal Prism Circuit

[cupid.callin]

The correct one
I'm not sure it's the right time yet to give away the answer.

I did the same you did ...

So your answer is 33R/28 ?

 

[gneill]

I did the same you did ...

So your answer is 33R/28 ?

Nope. A bit smaller.

 

[cupid.callin]

smaller than 1.7R ?

Here's how i solved ... Bold black lines are the resistances

 

[gneill]

What happened to the resistances ab, cd, a'b', c'd' ?

 

[cupid.callin]

there won't be any current through them right? so we can just remove them. Is that wrong ?

 

[gneill]

there won't be any current through them right? so we can just remove them. Is that wrong ?

I don't think that you can assume that there will be no current through them.

 

[zorro]

Sure. I've only labeled some of the resistances, the rest should be obvious by color code and symmetry.

Did you get 17R/16?

 

[gneill]

Did you get 17R/16?

Nope. A bit too small.

 

[gneill]

Here's the next step in the simplification. The diagram is still symmetrical, so the Delta-Y transformations at either end will be the same...

 

[SammyS]

Yup. That's what I had & did.

 

[zorro]

I got it - 23R/20
Thanks!

 

[gneill]

I got it - 23R/20
Thanks!

Yes, that's it. Attached is the summary of the simplifications used.