Re: Is zero even or odd?

From: John Fields (jfields_at_austininstruments.com)
Date: 12/23/04 

Date: Thu, 23 Dec 2004 16:16:15 -0600

On Thu, 23 Dec 2004 22:45:26 +0100, Michael Mendelsohn
<invalid@msgid.michael.mendelsohn.de> wrote:

>"Nicholas O. Lindan" schrieb:
>> "Michael Mendelsohn" <invalid@msgid.michael.mendelsohn.de> wrote
>> > If in measuring a resistor, we find 0.0A at 0.0V, is the resistance 1
>> > Ohm, then?
>>
>> Touche.
>>
>> But, yes, I'll say it is 1, just not in conventional ohms.
>> At 0.0A and 0.0V any scaling factor can apply to the volts
>> and amps without changing the measurement:
>>
>> 1 new volt / 1 new amp = new value of the resistor.
>>
>> 0 new volts / 0 new amps = 1 * (1 volt / 1 amp) = new value of the resistor.
>>
>> Value of the resistor = 1 new ohm.
>
>When checking it turned out that some thief had actually stolen the
>resistor where 0V,0A was measured. The circuit was broken, but noone
>noticed because the voltage was zero. 

---
AHA! Pilot error!
In truth, the E in 
               E
          R = ---
               I
refers to the voltage _across_ the resistor, (a shunt, was it?) which
you didn't measure.  What you measured was the voltage from the low
side of where the resistor was supposed to be to ground, which gave
you zero volts which corresponded, also, to zero amps.  Had you
measured the voltage _across_ where the resistor was supposed to be
you would have measured the entire supply voltage minus what was being
dropped across the load by the current flowing through the meter and
you would have concluded that by subtracting the meter current that
you would have had:
               E     E
          R = --- = --- = oo
               I     0
Which would have been right!
   
>Hence, vacuum/an insulator/air has a resistance of 1 new Ohm?
---
Aaarrghhhh!!!  NONONONONO, Please!!! Don't stick beans in your nose...
-- 
John Fields

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