ECN Forum Forums General Topics of the Trade General Discussion Area Conundrum

Kembo
You said cube and I heard square. I have a picture of this is I knew how to post it.
5/6 R

from Bob:

OK, for the heck of it, I just tacked together a cube of 100K resistors (a nice round value I had a bunch of in my junkbox). Picture of the cube is being sent for posting.

Each resistor was tested before soldering, and found to be pretty close to marked value. Well within the marked 5% tolerance.

Corner to corner resistance as measured with a Fluke 8060A = 82.94 kOhms. With 1 ohm resistors, .83 ohms sounds like a good answer.

Nothing like a real-world confirmation of the theory!



(edited to add image)

[This message has been edited by Webmaster (edited 09-20-2006).]

Thank's Bob for an excellent diagram, now I see where I went wrong.
I should have stayed up on the roof.

NJ, you actually built one, from tested components, ran an experiment, photographed it and posted it to ECN???
You crazy person! LOL!

Alan

[ ps. Still like to see the math. proof for that central 6-resistor group; I can't work out why it comes to 1/6 ohm. ]

I drew up a couple of drawings regarding this "Resistor Cube Condundrum", and posted them below.

Let me know what 'ya think!

Scott 35


*** Figure 1: "Cube" View ***

---------------------------------------------
---------------------------------------------


*** Figure 2: "1-Line" View ***

What can I say excelent replies guys.

Bob that diagram is spot on.

Alan what is wrong with NJs solution? I ended up building one up and actualy testing it as well

Scott briliant explination. Would you mind if I used your diagrams to explain this to some of my students?

Is it just the lighting/my monitor, or do the yellow bands on those resistors really look close enough to orange that they appear to be 10K ?

Not your monitor or the lighting. Just an annoying batch of resistors with yellowish-orange (or orangish-yellow) paint.

That's one reason I tested each one before installing them!

Kenbo:


For a small fee of $2,048,000², you may make one copy, for use on only one Student.
Any other Students will require additional Licensed copies (1 Licensed copy per Student), at which a reduced rate may be applied for larger group purchases of Licenses (7% discount for 10 to 25 Seats Licensed, 12.285% discount for 26 to 100 Seats Licensed).



Just like a typical Software's disclaimer and Licensing agreement, isn't it???


Anyhow, please pay no attention to the Legal-Eze stuff above, as it is 100% Male Bovine Fecal Matter (Bull Poop!)

That text above could be spread across a Lawn, and will really make the Grass grow nice and green!

The People at the Bandini Corporation purchase matter similar to that text, and distribute it in 2.0 cubic foot bags, which are sold at Lawn and Garden Centers
(anyone remember the "Ski Bandini Mountain" Commercial?).

But Seriously

Feel free to use these drawings for discussions and/or examples, in your Classes!
In fact, feel free to use any of the stuff I have posted, for Classroom examples / discussions!

This applies to anyone at ECN who might have a use for the posted techno-electro-mumbo-jumbo I have placed at ECN.

Also, there will be no charge -
except the previously described Licensing fees in the Licensing Agreement above...



Scott35

Oh, forgot to ask/mention:

If needed, contact me via e-mail, and I can send you drawings/information in:

• Full Size (not reduced to 640x480 dpi),
• .GIF, .JPG, .TIF, or .BMP file format (for Raster images),
• .WMF file format (for Vector images),
• .DWG, or .DXF file format (for AutoCAD drawings),
• Excel spreadsheets, or text in some usable format.

e-mail address is (spelled phonetically):

setelectric at pacbell dot net

Scott35