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From: Mark Edwards on 30 Mar 2010 10:38 No cluons were harmed when Richard Chambers wrote: >I do not understand why we are posting all this to alt.religion.kibology >(where it is probably not relevant), or to sci.physics (where it is too >trivial and basic). My apologies to both groups if this is a nuisance I find this discussion fascinating and educational. Mark Edwards -- Proof of Sanity Forged Upon Request
From: Otto Bahn on 30 Mar 2010 10:42 "Peter Duncanson (BrE)" <mail(a)peterduncanson.net> wrote >>>>>> energy being delivered, the amount of which is >>>>>> determined by the wattage, >>>>> >>>>> I suppose one might casually say that, but in fact the power >>>>> (wattage) is a function of the current and resistance, not >>>>> vise-versa. >>>> >>>> How so? >>> >>> Power is a result of passing a current through a resistance; >>> current and rsistance aren't a result of power. >> >>It could be also said that >>the current is a result of applying voltage to a resistance. >>:-) > > That is one way of creating a current. Another is with a varying > magnetic field as in generators and in the secondary windings of > transformers. That's just cartoon stuff. --oTTo--
From: PaulJK on 30 Mar 2010 12:03 Peter Duncanson (BrE) wrote: > On Tue, 30 Mar 2010 17:57:10 +1200, "PaulJK" > <paul.kriha(a)paradise.net.nz> wrote: > >> >> At every point in time and at every point inside the body >> of a resistive conductor the Ohm's law applies with 100% >> accuracy. It is applicable even when the conductors are >> never completely homogeneous and never absolutely linear. >> >> (Excepting conditions in the super conductive environment.) > > That assumes that the current results from a potential difference, a > voltage. Since we were originally talking about current passing through a persons body, that was indeed an assumption I made silently. > If a closed circuit, a resistive ring for instance, is put in a varying > magnetic field an induced current will flow but no potential difference > will be created. If you break the circuit you will generate potential difference between the ends of the broken loop. You can view the closed circuit as infinite number of infinitely small voltage generators parallel to infinite number of infinitely small resistances. Each voltage generator feeds the generated current through the rest of the loop which has a finite resistance. From the macro point of view it looks as if no potential differences exist. You be the judge if this is tongue in cheek or not. :-) pjk
From: Doctroid on 30 Mar 2010 11:17 In article <hot3lv02v8c(a)news3.newsguy.com>, "J. Clarke" <jclarke.usenet(a)cox.net> wrote: > On 3/30/2010 10:27 AM, Doctroid wrote: > > In article<ebv3r55bt7v35nvejvpplqhr51dlpkklhi(a)4ax.com>, > > barbara(a)bookpro.com wrote: > > > >> On Tue, 30 Mar 2010 09:29:17 -0400, "J. Clarke" > >> <jclarke.usenet(a)cox.net> wrote: > >> > >>> On 3/30/2010 8:07 AM, Doctroid wrote: > >> > >>>> Anyone wishing to take this up with me further may write to me at > >>>> rsholmes at physics dot syr dot edu. > >>> > >>> Would you be kind enough to provide us an example of the equation that V > >>> and I follow for a material that does not obey ohm's law and tell us for > >>> what material that equation is valid? > >> > >> Oopsie, looks like you posted this accidentally to Usenet. > >> > >> BW > > > > 'sOK, I can take this one. > > > > Zener diode: > > > > http://www.reuk.co.uk/OtherImages/current-voltage-graph-zener-diode.gif > > The requirement was for the equation and the material, not a link to a > Web site. Sorry, I figured you were capable of "clicking" on the "link" with your "mouse". I'd've pasted the graph here, but Usenet is a text medium. There isn't an equation; the behavior is complex and more easily understood from a graph. But do feel free to do a fit if you can come up with a suitable function. Material specified above. -- Sig available on request. - Doctroid
From: Otto Bahn on 30 Mar 2010 11:22
"Doctroid" <doctroid(a)mailinator.com> wrote >> >>>> Anyone wishing to take this up with me further may write to me at >> >>>> rsholmes at physics dot syr dot edu. >> >>> >> >>> Would you be kind enough to provide us an example of the equation >> >>> that V >> >>> and I follow for a material that does not obey ohm's law and tell us >> >>> for >> >>> what material that equation is valid? >> >> >> >> Oopsie, looks like you posted this accidentally to Usenet. >> >> >> >> BW >> > >> > 'sOK, I can take this one. >> > >> > Zener diode: >> > >> > http://www.reuk.co.uk/OtherImages/current-voltage-graph-zener-diode.gif >> >> The requirement was for the equation and the material, not a link to a >> Web site. > > Sorry, I figured you were capable of "clicking" on the "link" with your > "mouse". I'd've pasted the graph here, but Usenet is a text medium. > There isn't an equation; the behavior is complex and more easily > understood from a graph. But do feel free to do a fit if you can come > up with a suitable function. Material specified above. I keep waiting for some poster to do a J-K flip flop. --oTTo-- |