Re: Basic Question

Benj <bjacoby@[EMAIL PROTECTED]
> wrote:
> On Sep 5, 1:05?am, j...@[EMAIL PROTECTED]
 wrote:
>> Benj <bjac...@[EMAIL PROTECTED]
> wrote:
>> > But do not be misled by the clowns here and elsewhere who pretend
that
>> > ALL substances follow Ohm's law. They don't. Even copper, which is
>> > more or less a standard material for electrical wires, is rather
>> > unstable with regard to Ohm's law. When resistors are made from coils
>> > of wire, copper is NOT the wire used for this reason. Other
conductors
>> > (like say plasmas) are FAR from following Ohm's Law.
> 
>> EVERYTHING follows Ohm's law at the macro, or bulk if you like that
>> term better, level.
> 
> Total error! Completely mistaken and ignorant.  Ohms law is a LINEAR
> relation****p between voltage and current. FEW things follow it
> closely. Come on tell us about the "ohms law" relation****p in an
> ordinary light bulb? Ohms law is a MATERIAL property and can't be
> derived from Maxwell's equations! Obviously this is one of the several
> "clowns" I was talking about.

All real materials have a temperature coefficient, which is why
resistance is specified at a temperature.

 
>> The reason copper wire is not used to make wire wound resistors is the
>> resistivity of copper is so low it would take huge amounts of wire
>> to make a resistor which could be made with a far fewer number of
>> turns of a wire with more resistivity.
> 
> Another lie. You just make this stuff up?  I take it you've never
> tried to make a resistor out of copper wire? Yes, it is of value to
> use wire that has more resistivity to make large value resistors, but
> what about low ohmage resistors? Duh. They are unstable. Go try it,
> bunky!

As a matter of fact my first job out of school was designing resistors,
among other things, for a component manufacturer.
 
Slept all the way through high school physics, didn't you?

Where do you get all these bizarre ideas? 

-- 
Jim Pennino

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