Resistance Value?
Richard O'Neill
richardoneill at earthlink.net
Fri Oct 26 09:10:25 CDT 2012
Karl,
If you eliminate all resistors except those between the two test
points you have three resistors that measure three ohms. Add four more
resistors (total of seven) to form a rectangle and the measurement will
be < 1.5 ohms. Add an additional seventeen resistors to form another
rectangle and the resistance decreases to scarcely more than one ohm
between the test points.
Add progressively more of those little buggers and the resistance
between the two test points continues to decline in ever decreasing
amounts. From that I theorized that as 'n' (number of resistors)
approaches infinity the equivalent resistance approaches one ohm. A
finite number of resistors may never quite decrease the equivalent
resistance to a value of one ohm but it sure does kick the heck out of
it. Good enough for guvment work. Heisenberg might have been proud. ;-)
Richard
PS. That's why Physicists are only worth two points (in the original
cartoon) while mathematicians are worth three. They take much longer to
get the answer.
On 10/25/2012 10:23 PM, Karl W4KRL wrote:
> One ohm cannot be correct. If you eliminate all resistors except the four
> that connect the two measurement points you end up with two one ohm
> resistors in series that are in parallel with two other one ohm resistors in
> series hence one ohm between the measurement terminals. Since the rest of
> the infinite network is in parallel with these resistors the value must be
> less than one ohm.
>
> Karl W4KRL
>
> -----Original Message-----
> From: Richard O'Neill [mailto:richardoneill at earthlink.net]
> Sent: Thursday, October 25, 2012 7:04 PM
> To: tacos at amrad.org
> Subject: Re: Resistance Value?
>
> Correct! You win the Grand Prize, a one ohm resistor. :-) Would you care
> to inform us how you arrived at the answer?
>
> Richard
>
>
> On 10/25/2012 6:34 PM, Phil wrote:
>> One ohm.
>>
>> Phil M1GWZ
>>
>>
>> On 25 Oct 2012, at 20:32, Karl W4KRL wrote:
>>
>>> My solution is based on observing that an infinite number of parallel
>>> resistors approaches zero resistance. Each row and column of
>>> resistors can be reduced to a short circuit connected to the "center"
>>> elements through two series resistors.
>>>
>>> Karl W4KRL
>>>
>>> -----Original Message-----
>>> From: Richard O'Neill [mailto:richardoneill at earthlink.net]
>>> Sent: Thursday, October 25, 2012 2:14 PM
>>> To: W4KRL at arrl.net
>>> Cc: Karl W4KRL; 'Tacos AMRAD'
>>> Subject: Re: Resistance Value?
>>>
>>>
>>> Awaiting your drawing. :-) The proof of Fermat's last theorem
>>> required
>>> 358 years but this problem isn't that difficult to solve.
>>> In fact, it's intuitively obvious and a good exercise for EE's. :-D
>>>
>>> Richard
>>>
>>> On 10/25/2012 12:24 AM, Karl W4KRL wrote:
>>>> My non-mathematical approach yields 1/2 Ohm. Am I correct? If so I
>>>> will draw the approach tomorrow.
>>>>
>>>> Karl W4KRL
>>>>
>>> <resistor grid.jpg>_______________________________________________
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