Help solving a puzzle:

[dyverdwn]

I need to know the terminal resistance for each, with all the resistors being 1K ohm in value for this configuration:

           o---ZZZ---o---ZZZ---o
           /\             /\              /
          Z  Z          Z Z           Z
         Z    Z        Z    Z        Z
        Z       Z     Z       Z     Z
       /          \   /           \   /
      o---ZZZ--o---ZZZ--- o

where ZZZ are the 1K ohm resistors
and o are the connections points

HELP......

The pic above does not seem to display properly so I have attached a pic and also in the next message a link

 

[dyverdwn]

Didn't show up right

It appears that it didn't show up correctly...

the website to the puzzle is:

GC1CE6B - A Unknown Cache in Ontario, Canada called Resistance Is Futile created by RockHarder

 

[Pommie]

If you put

 before your diagram and [/co[I][/I]de] after it, then the BBS software won't remove all the spaces and it might make sense.

Mike.

 

[dyverdwn]

Help...

Anyone have any ideas????

 

[ExtravDreams]

I believe the solution is: 34/55 Kohms

 

[Leftyretro]

618 ohms ?

 

[denikar]

The answer is 42.

 

[dyverdwn]

Answer of 42

Can you explain how you arrived at 42 Ohms? I understand the formula for a single delta config Rxy = (RA+RB)RC/(RA+RB+RC) so do I start on the left and "cascade" the calculated value over to the delta config to the right as I solve for it?

 

[Nigel Goodwin]

Can you explain how you arrived at 42 Ohms?

He didn't say 42 ohms, he said just 42 - which is "the answer to life, the universe, and everything".

 

[sniper007]

Resistance between which terminals you need?

 

[dyverdwn]

Which terminals

The last two on the right, so the "total" resistance for this circuit as a device

 

[sniper007]

Multisim calculated 618 hm:

Probably you need this calucate with your head. My advice is to use technique Y-Δ transform.

Y-Δ transform - Wikipedia, the free encyclopedia


Sniper

 

[Leftyretro]

Multisim calculated 618 hm:

Probably you need this calucate with your head. My advice is to use technique Y-Δ transform.

Y-Δ transform - Wikipedia, the free encyclopedia


Sniper

If 618 is correct, I got that by just doing series/parallel reduction from left to right.

Lefty

 

[dyverdwn]

None...

Apparently that is not the correct answer..... anyone else have a solution???

HELP....

 

[ericgibbs]

hi,
Why don't you make it and measure the resistance with a ohm meter.?

 

[ericgibbs]

hi,
By reduction I make it 618.2R

 

[neil.wilson]

or even 618.18R

 

[ericgibbs]

or even 618.18R

hi neil,
I can live with that..

I think the OP in an earlier post said that 618.xR was not the answer,
most likely he's not given us the full question.

 

[ecerfoglio]

I think the OP in an earlier post said that 618.xR was not the answer,
most likely he's not given us the full question.

Once I saw a similar puzzle, but it had an infinite number of triangles to the left side (or was it made with squares? I don´t remember, it was many years ago). This type of topologies ussualy make very good puzzles.

Perhaps this is the case, which of course has a diferent answer than the finite one we were solving.

 

[sniper007]

Apparently that is not the correct answer..... anyone else have a solution???

HELP....

I don't think so