Driver to drive?

[Michael A. Terrell]

Jim Yanik wrote:

sugar does not dissolve in gasoline.

It does disolve in the water that condenses and settles to the bottom
of the tank. I've seen over an inch in a couple old tanks I had to
replace. Also, if you fill up right after a station gets their
delivery, it stirs up the water in their tank, and gets pumped into your
tank.




--
You can't have a sense of humor, if you have no sense!

 

[daestrom]

George Orr wrote:

On Mon, 10 Aug 2009 18:26:56 -0400, daestrom <daestrom@twcny.rr.com
wrote:

Another clue for you (the clueless) is that the headlights on those old
cars would be dimmer at idle than when driving. This is because the
voltage would drop to just the battery voltage when the DC generator was
spinning so slowly and would rise up to the regulator set-point once you
sped up the engine.

You don't have a clue, you can't be taught, so <PLONK

daestrom

You're a goddamned retard, and I OWNED generators and I knew at ten
years old why they were changed out to alternators by the industry
because I worked on cars back then. I knew what Chilton's was before your
little pussy ass was even born, boy.

Delco factories were right up the road, and Detroit was a little
farther.

You couldn't teach a fucking dog a pavlovian response. That is truly
sad.

Plonk? It takes a true retard to announce his filter edit sessions.
You are one such retard.

Gee, a new alias for you because you can't stand being plonked? Pity

 

[daestrom]

George Orr wrote:

On Mon, 10 Aug 2009 18:33:15 -0400, daestrom <daestrom@twcny.rr.com
wrote:

Archimedes' Lever wrote:
On Sun, 09 Aug 2009 11:03:48 -0400, daestrom <daestrom@twcny.rr.com
wrote:

This was necessary because when the engine was
turning at 3k-4k, you couldn't have the generator spinning much faster
than 4k itself or it would disintegrate from the centrifugal forces.
(unless you want to spend the $ on a variable-ratio belt drive for just
the DC generator).
There are no cars that incorporate variable ratio belt drives in
America. It is too expensive, and there is no need.

And that's why, you illiterate chump, I said what I did. I did *not*
*ever* say they actually were driven by a variable ratio drive.

What I said was the ratio was kept low so as to *not* require such a
drive. Too high a ratio and the generator would self-destruct.

A typical loser tactic, claim that I said something ridiculous and then
argue that I'm clearly wrong. But the text is there for you to read
(and re-read and re-read until you have some comprehension).

daestrom

You're an idiot.

Creating yet another alias for yourself so you can get around peoples
killfile. That's a sure sign of maniac

 

[Rich Grise]

On Wed, 12 Aug 2009 14:51:12 -0400, Spehro Pefhany wrote:

On Wed, 12 Aug 2009 18:13:29 GMT, Rich Grise <richgrise@example.net
On Wed, 12 Aug 2009 08:53:38 -0400, Spehro Pefhany wrote:
On Fri, 07 Aug 2009 05:12:47 -0700, the renowned John Larkin

People use stainless and manganin wire to run to really cold (liquid
helium) gadgets so as to not leak too much heat.

I thought this was because they stand up to the cryo temps better than
other alloys.

No, 4K doesn't really hurt most materials.

Strength vs. thermal conductivity is an interesting ratio too. Very
important for constructing hot runner injection molds where you have
hundreds of degrees temperature differential and rather large forces
(that cycle every few seconds).

Google "Garwin
thermal integral" for some messy math.

We also use phosphor-bronze alloy, but I think its main advantage is
high electrical resisitivity (while still being reasonable to handle),
and thus low thermal conductivity, rather than a deviation from the
theoretical (Lorenz) proportionality. IOW, electrically and thermally
it just behaves as a very (impractically) thin copper wire.


This (thermal :: electrical) kinda breaks down with diamond. ;-)

Since when is diamond a metal?

Sorry, I thought we were just comparing thermal conductivity with heat
conductivity. But then there's beryllia, borides, nitrides, etc.

Sorry if I spoiled your day. ;-P

Cheers!
Rich

 

[Jim Thompson]

On Wed, 12 Aug 2009 16:44:19 -0400, "Michael A. Terrell"
<mike.terrell@earthlink.net> wrote:

Jim Yanik wrote:

sugar does not dissolve in gasoline.


It does disolve in the water that condenses and settles to the bottom
of the tank. I've seen over an inch in a couple old tanks I had to
replace. Also, if you fill up right after a station gets their
delivery, it stirs up the water in their tank, and gets pumped into your
tank.

I thought the "additive of choice" was moth balls ?

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

"The tree of liberty must be refreshed from time to time with the
blood of patriots and tyrants. It is it's natural manure."
- Thomas Jefferson, November 13, 1787

 

[AZ Nomad]

On Tue, 11 Aug 2009 14:47:02 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote:

On Tue, 11 Aug 2009 16:39:19 -0500, AZ Nomad
aznomad.3@PremoveOBthisOX.COM> wrote:

On Tue, 11 Aug 2009 21:10:19 GMT, Richard the Dreaded Libertarian <freedom_guy@example.net> wrote:
On Tue, 11 Aug 2009 14:36:23 -0500, AZ Nomad wrote:
On Mon, 10 Aug 2009 15:09:54 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote:
On Mon, 10 Aug 2009 15:16:24 -0500, AZ Nomad

On Mon, 10 Aug 2009 11:50:32 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote:
"When implemented, the Complete Lives system produces a priority curve
on which individuals aged between roughly 15 and 40 years get the most
substantial chance, whereas the youngest and oldest people get chances
that are attenuated... The Complete Lives system justifies preference
to younger people because of priority to the worst-off rather than
instrumental value."

http://www.sodahead.com/question/532683/rahms-brother-dr-ezekiel-emanuel-the-death-czar-obama-health-policy-advisor-announced-a-new-stystem-for-selecting-who-in-the-population-should-be-killeda-federal-system-for-withdrawing-care-from-those-chosen-for-death---do-you-care/

Obama's health program... Hitler Care

You're a loon.

Be nice. Otherwise, when you get ill, you'll be declared "surplus"

Please spread your RW lies somewhere else.

Lies? Just wait. You'll see the effects when the chickens come home to
roost.

Pointless scare mongering.
;


The only way socialism can present the illusion of "working" is at
gunpoint.

That hasn't been the experience of other western countries. Denying health care
while problems are cheap so that people end up in the emergency room costing
thousands of times more is a piss poor solution.

But the solution to that is NOT ALL that is in the bill. How can you
be so ignorant? I'll bet that you HAVE NOT READ the bill. I have.
it's downright scary :-(

Don't talk to me about ignorant. You're the fool spreading lies
dreamed up by Palin's press crew.

 

[Jim Thompson]

On Wed, 12 Aug 2009 17:51:59 -0500, AZ Nomad
<aznomad.3@PremoveOBthisOX.COM> wrote:

On Tue, 11 Aug 2009 14:47:02 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote:
On Tue, 11 Aug 2009 16:39:19 -0500, AZ Nomad
aznomad.3@PremoveOBthisOX.COM> wrote:

On Tue, 11 Aug 2009 21:10:19 GMT, Richard the Dreaded Libertarian <freedom_guy@example.net> wrote:
On Tue, 11 Aug 2009 14:36:23 -0500, AZ Nomad wrote:
On Mon, 10 Aug 2009 15:09:54 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote:
On Mon, 10 Aug 2009 15:16:24 -0500, AZ Nomad

On Mon, 10 Aug 2009 11:50:32 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote:
"When implemented, the Complete Lives system produces a priority curve
on which individuals aged between roughly 15 and 40 years get the most
substantial chance, whereas the youngest and oldest people get chances
that are attenuated... The Complete Lives system justifies preference
to younger people because of priority to the worst-off rather than
instrumental value."

http://www.sodahead.com/question/532683/rahms-brother-dr-ezekiel-emanuel-the-death-czar-obama-health-policy-advisor-announced-a-new-stystem-for-selecting-who-in-the-population-should-be-killeda-federal-system-for-withdrawing-care-from-those-chosen-for-death---do-you-care/

Obama's health program... Hitler Care

You're a loon.

Be nice. Otherwise, when you get ill, you'll be declared "surplus"

Please spread your RW lies somewhere else.

Lies? Just wait. You'll see the effects when the chickens come home to
roost.

Pointless scare mongering.
;


The only way socialism can present the illusion of "working" is at
gunpoint.

That hasn't been the experience of other western countries. Denying health care
while problems are cheap so that people end up in the emergency room costing
thousands of times more is a piss poor solution.

But the solution to that is NOT ALL that is in the bill. How can you
be so ignorant? I'll bet that you HAVE NOT READ the bill. I have.
it's downright scary :-(

Don't talk to me about ignorant. You're the fool spreading lies
dreamed up by Palin's press crew.

You ARE ignorant, to an extreme degree; and you haven't read the bill
either... illiterate pretender to an AZ connection ;-) Plonk!

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

Liberals are so ignorant...
They don't even know the definition of ignorant

 

[Jim Thompson]

On Tue, 11 Aug 2009 18:43:42 +0100, Clint Sharp
<clint@clintsmc.demon.co.uk> wrote:

In message <2spt759j5psi87vp80e68irgfb5nq3397o@4ax.com>, Jim Thompson
To-Email-Use-The-Envelope-Icon@My-Web-Site.com> writes
God help us, this will be Obama's next stunt...

http://news.bbc.co.uk/2/hi/uk_news/education/8192234.stm

...Jim Thompson
I hate the way the idiots think everyone has the right to be mediocre
and degrade every one else's achievements in the process by lowering the
signal to noise ratio.

All idiocy like this does is raise the bar further because everyone who
gets a university qualification now has to go and do a post grad
doctorate to get to the same level as before.

There's a reason that entrance exams are set and not everyone can be a
rocket scientist or chip designer!

Things will ultimately settle out. Many universities presently almost
completely ignore SAT scores and base admission upon interviews. I
personally did interviews of high school students, seeking admission
to MIT, for close to thirty years.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine Sometimes I even put it in the food

 

[George Herold]

On Aug 7, 8:12 am, John Larkin
<jjSNIPlar...@highTHISlandtechnology.com> wrote:

On Thu, 06 Aug 2009 22:29:22 -0700, Archimedes' Lever

OneBigLe...@InfiniteSeries.Org> wrote:

 Use big nylon nuts and bolts.  Or glass filled epoxy.

Which don't conduct electricity very well.

John

 You do not have to rely on the fasteners to provide the conduction path
between two mating surfaces.  In fact, you shouldn't.

 I thought you were talking about thermal conduction anyway.

I was talking about the thermal conductivity of electrical conductors.
The same electrons that transport current also transport heat - pretty
much - so most metals are the same as regards how much current you can
carry for a given heat loss. This matters for stuff like getting power
into a crystal oven or a cryogenic gadget, where we really don't want
the heat loss through the leads.

People use stainless and manganin wire to run to really cold (liquid
helium) gadgets so as to not leak too much heat. Google "Garwin
thermal integral" for some messy math.

John

Phosphor bronze is a nice material for this also. It’s also non-
magnetic.

George H.

 

[DarkSucker]

On Wed, 12 Aug 2009 05:29:19 -0700, "JosephKK"<quiettechblue@yahoo.com>
wrote:

On Fri, 07 Aug 2009 22:46:14 -0700, DarkSucker
DarkSucker@thebigbarattheendoftheuniverse.org> wrote:

On Sat, 08 Aug 2009 00:09:56 -0500, krw <krw@att.bizzzzzzzzzzz> wrote:

On Fri, 07 Aug 2009 21:27:42 -0700, StickThatInYourPipeAndSmokeIt
Zarathustra@thusspoke.org> wrote:

On Fri, 07 Aug 2009 23:13:27 -0500, krw <krw@att.bizzzzzzzzzzz> wrote:

On Fri, 07 Aug 2009 20:55:02 -0700, Jim Thompson
To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote:

On Sat, 08 Aug 2009 03:47:11 GMT, "John KD5YI"
groups2_dot_jocjo@xoxy.net> wrote:


"Rich Grise" <richgrise@example.net> wrote in message
newsan.2009.08.07.19.14.42.685782@example.net...
On Thu, 06 Aug 2009 17:19:44 +0000, John KD5YI wrote:
"Jim Thompson" <To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote in
message news:qi6975htdimheq9lkg1lt85f2dtpjiuirf@4ax.com...
Several years ago, as an aside to another thermal question, I asked...

"Brings to mind a thing I've been pondering... what's the thermal
resistance of 3/4" plywood ?"

Never saw a response.

That's because you've got all the smart people plonked. There were at
least a half-dozen good responses, but apparently the sand got in
your eyes.

From http://www.engineeringtoolbox.com/thermal-conductivity-d_429.html
about .13 W/mK is the thermal conductivity. So, about 7.7 mK/W
resistivity.

Thompson is such an asshole, he doesn't really deserve an answer - why
the hell should we do his googling for him?

Thanks,
Rich


Well, first of all, it's not my job to try to decide who deserves an answer
and who does not.

Second, I find that I learn things by trying to help others. So, it's
somewhat of a selfish motive, I guess.

You're welcome,
John

Aaaaah! Life is wonderful... I've been promoted to "asshole"! Are
there grades of "asshole", like "lieutenant asshole", or "rear admiral
asshole"... ?

Sure, many of us are privates, but there are also general assholes,
like Slowman and DimBulb. ...and of course, the leftist fairies'
assholes aren't private at all.


No I'm an Admiral.

Now, AlwaysWrong, there is nothing admiral about you.

You? You are like that of a sunspot on my dim bulb. That is the level
of your existence. A thermal void.

Your bulb is so dim even the sun won't light it.


No. I absorb the dark, leaving behind only light...

Dogs, you are so very really good at being AlwaysWrong.

Is that karmic dogma or dogmic karma?

Oh, that's right... it's just you being retarded... again.

 

[krw]

On Wed, 12 Aug 2009 16:44:19 -0400, "Michael A. Terrell"
<mike.terrell@earthlink.net> wrote:

Jim Yanik wrote:

sugar does not dissolve in gasoline.


It does disolve in the water that condenses and settles to the bottom
of the tank. I've seen over an inch in a couple old tanks I had to
replace. Also, if you fill up right after a station gets their
delivery, it stirs up the water in their tank, and gets pumped into your
tank.

You don't get much water in gas anymore since they replaced all the
tanks with dual wall tanks, over the last few decades. It's a good
thing because it would wreak havoc with the food the government
insists they put in gas now.

 

[Mycelium]

On Wed, 12 Aug 2009 08:53:38 -0400, Spehro Pefhany
<speffSNIP@interlogDOTyou.knowwhat> wrote:

On Fri, 07 Aug 2009 05:12:47 -0700, the renowned John Larkin
jjSNIPlarkin@highTHISlandtechnology.com> wrote:

On Thu, 06 Aug 2009 22:29:22 -0700, Archimedes' Lever
OneBigLever@InfiniteSeries.Org> wrote:



Use big nylon nuts and bolts. Or glass filled epoxy.

Which don't conduct electricity very well.

John


You do not have to rely on the fasteners to provide the conduction path
between two mating surfaces. In fact, you shouldn't.

I thought you were talking about thermal conduction anyway.

I was talking about the thermal conductivity of electrical conductors.
The same electrons that transport current also transport heat - pretty
much - so most metals are the same as regards how much current you can
carry for a given heat loss. This matters for stuff like getting power
into a crystal oven or a cryogenic gadget, where we really don't want
the heat loss through the leads.

People use stainless and manganin wire to run to really cold (liquid
helium) gadgets so as to not leak too much heat. Google "Garwin
thermal integral" for some messy math.

John

We also use phosphor-bronze alloy, but I think its main advantage is
high electrical resisitivity (while still being reasonable to handle),
and thus low thermal conductivity, rather than a deviation from the
theoretical (Lorenz) proportionality. IOW, electrically and thermally
it just behaves as a very (impractically) thin copper wire.


Best regards,
Spehro Pefhany

Magnetically couple power into the chamber, and use bluetooth to radio
the data out.

 

[krw]

On Wed, 12 Aug 2009 16:47:57 -0400, daestrom <daestrom@twcny.rr.com>
wrote:

George Orr wrote:
On Mon, 10 Aug 2009 18:26:56 -0400, daestrom <daestrom@twcny.rr.com
wrote:

Another clue for you (the clueless) is that the headlights on those old
cars would be dimmer at idle than when driving. This is because the
voltage would drop to just the battery voltage when the DC generator was
spinning so slowly and would rise up to the regulator set-point once you
sped up the engine.

You don't have a clue, you can't be taught, so <PLONK

daestrom

You're a goddamned retard, and I OWNED generators and I knew at ten
years old why they were changed out to alternators by the industry
because I worked on cars back then. I knew what Chilton's was before your
little pussy ass was even born, boy.

Delco factories were right up the road, and Detroit was a little
farther.

You couldn't teach a fucking dog a pavlovian response. That is truly
sad.

Plonk? It takes a true retard to announce his filter edit sessions.
You are one such retard.

Gee, a new alias for you because you can't stand being plonked? Pity

DimBulb has over 60 sock puppets, he digs out of his mommy's hamper.
He'll likely have a dozen more by laundry day.

 

[life imitates life]

On Wed, 12 Aug 2009 07:32:21 -0700, John Larkin
<jjSNIPlarkin@highTHISlandtechnology.com> wrote:

On Wed, 12 Aug 2009 05:05:33 -0700,
"JosephKK"<quiettechblue@yahoo.com> wrote:

On Wed, 05 Aug 2009 21:18:51 -0700, John Larkin
jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:

On Wed, 05 Aug 2009 20:57:04 -0700,
"JosephKK"<quiettechblue@yahoo.com> wrote:

On Sun, 02 Aug 2009 17:25:17 -0700, John Larkin
jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:

On Sun, 02 Aug 2009 16:45:07 -0700, Robert Baer
robertbaer@localnet.com> wrote:

John Larkin wrote:

snip

Ahh.. that is what someone else implied and did *not* specify.
But since i am not into thermal conductivity and/or insulation, the
"meter" does not make sense to me in this context.
Would have to dig into this usage and the units.

Thermal conductivity, in SI units, is specified in watts per
meter-Kelvin.

Aluminum is about 240 w/m-K.

So if you had a 1-meter cube of the stuff, and forced a 1 degree C
difference across opposite faces, 240 watts of heat would flow.

The thermal resistance would be the reciprocal, about 0.004 degrees C
per watt.

Starting from there, it's easy to scale for area and thickness.

Fun fact: the thermal resistance of copper is about 150,000 degs C per
watt per ohm.

The standard unit of thermal conductivity (inverse of thermal
resistance) is W/(m*K), no "ohms" involved. So much for your "fun
fact"

What a doofus you are determined to be. One can certainly define a
material property Z = thermal conductivity per ohm of electrical
resistance. For most pure metals, it's about 150,000 (K/W)/ohm.

Among other things, it's a quick way to convert wire tables into
values of thermal resistance for copper wires or rods.

QED

What you're proving is how rigid your thinking is constrained by
"standard units." Lighten up a little.

John

Multi-dimensional...

 

[Michael A. Terrell]

Joerg wrote:

Tim Williams wrote:
"Joerg" <invalid@invalid.invalid> wrote in message
news:7e32hlF2e06nuU5@mid.individual.net...
For sauerkraut-wiring? Cool! I am down to about 2-3. You can be lucky if
you find NOS of this stuff and the silver on the dual solder-lugs isn't
completely black.

I have a baggie of nice and small ones, like 0.25" pitch or something like
that. They're great for high density stuff.

http://webpages.charter.net/dawill/tmoranwms/Elec_Compound9.jpg

Not the greatest up-close, but you can get some idea from the resistors
going into them. Made this class D tube amplifier a snap, plenty of pins
available.


Mine are flat, basically >1" wide strips of phenolic with lugs on there.
The advantage is that you get two lugs per contact so you don't have to
cram wires so much. The disadvantage is that you can't have multi-watt
resistors and stuff come too close or there will be a "burnt toast whiff".

Keystone still makes them:

http://www.keyelco.com/pdfs/M55p130.pdf

http://www.keyelco.com/pdfs/M55p131.pdf

http://www.keyelco.com/pdfs/M55p132.pdf

http://www.keyelco.com/pdfs/M55p133.pdf


--
You can't have a sense of humor, if you have no sense!

 

[Kai]

On Wed, 12 Aug 2009 16:50:21 -0400, daestrom <daestrom@twcny.rr.com>
wrote:

George Orr wrote:
On Mon, 10 Aug 2009 18:33:15 -0400, daestrom <daestrom@twcny.rr.com
wrote:

Archimedes' Lever wrote:
On Sun, 09 Aug 2009 11:03:48 -0400, daestrom <daestrom@twcny.rr.com
wrote:

This was necessary because when the engine was
turning at 3k-4k, you couldn't have the generator spinning much faster
than 4k itself or it would disintegrate from the centrifugal forces.
(unless you want to spend the $ on a variable-ratio belt drive for just
the DC generator).
There are no cars that incorporate variable ratio belt drives in
America. It is too expensive, and there is no need.

And that's why, you illiterate chump, I said what I did. I did *not*
*ever* say they actually were driven by a variable ratio drive.

What I said was the ratio was kept low so as to *not* require such a
drive. Too high a ratio and the generator would self-destruct.

A typical loser tactic, claim that I said something ridiculous and then
argue that I'm clearly wrong. But the text is there for you to read
(and re-read and re-read until you have some comprehension).

daestrom

You're an idiot.

Creating yet another alias for yourself so you can get around peoples
killfile. That's a sure sign of maniac

Are you sure, pussy boy?

 

[Archimedes' Lever]

On Wed, 12 Aug 2009 21:08:12 GMT, Rich Grise <richgrise@example.net>
wrote:

On Wed, 12 Aug 2009 14:51:12 -0400, Spehro Pefhany wrote:
On Wed, 12 Aug 2009 18:13:29 GMT, Rich Grise <richgrise@example.net
On Wed, 12 Aug 2009 08:53:38 -0400, Spehro Pefhany wrote:
On Fri, 07 Aug 2009 05:12:47 -0700, the renowned John Larkin

People use stainless and manganin wire to run to really cold (liquid
helium) gadgets so as to not leak too much heat.

I thought this was because they stand up to the cryo temps better than
other alloys.

No, 4K doesn't really hurt most materials.

Strength vs. thermal conductivity is an interesting ratio too. Very
important for constructing hot runner injection molds where you have
hundreds of degrees temperature differential and rather large forces
(that cycle every few seconds).

Google "Garwin
thermal integral" for some messy math.

We also use phosphor-bronze alloy, but I think its main advantage is
high electrical resisitivity (while still being reasonable to handle),
and thus low thermal conductivity, rather than a deviation from the
theoretical (Lorenz) proportionality. IOW, electrically and thermally
it just behaves as a very (impractically) thin copper wire.


This (thermal :: electrical) kinda breaks down with diamond. ;-)

Since when is diamond a metal?

Sorry, I thought we were just comparing thermal conductivity with heat
conductivity. But then there's beryllia, borides, nitrides, etc.

Sorry if I spoiled your day. ;-P

Cheers!
Rich

Diamond is carbon, which is conductive, based on how it is organized,
and diamond is pretty dense.

 

[Paul Keinanen]

On Mon, 10 Aug 2009 22:05:42 -0400, clare@snyder.on.ca wrote:

The 6 amp motor means it draws 6 amps from the mains. It does not mean
ANYTHING as far as how much power it produces, other than that it
cannot produce more than 690 watts at 115 volts

Have you returned to constant current power distribution with 6 A
circuits ?

Arc lamps in the 1880's were specified by the number of amperes
(typically 6 A for street lighting). All lamps were series connected
and you could operate 20-25 of these in series from a 6 A DC generator
producing a 1000-1500 V DC loaded voltage. Thus, the voltage drop
across each arc lamp was about 55 V on average.

Paul

 

[JosephKK]

On Fri, 07 Aug 2009 16:37:14 GMT, Glen Walpert <nospam@null.void>
wrote:

On Thu, 06 Aug 2009 20:45:24 -0700,
"JosephKK"<quiettechblue@yahoo.com> wrote:

On Tue, 04 Aug 2009 22:02:28 -0600, Nicholas Kinar <n.kinar@usask.ca
wrote:


I believe that Digikey has these resistors:

http://www.digikey.com/

Example part number: Y1624-1KCT-ND


Apparently the temperature coefficient is listed as ą0.2ppm/°C for this
particular part number.

Crickey, what is it made of?

Those Vishay Bulk Metal resistors:

http://www.vishay.com/resistors-discrete/metal-foil/

are made of a proprietary variant of 75Ni-20Cr-3Al, which is roughly
an order of magnitude better than Shunt Manganin, and is the lowest
resistance tempco material known in the vicinity of room temperature.
One commercially available variant is known as Evanohm IIRC, available
as foil and wire in case you want to make your own resistors .

When comparing tempcos of different materials it is important also to
compare the specified temperature range or better yet look at the
resistance vs temp curve.

Low resistance TC metal alloys get their low TC the same way Invar
gets its low thermal expansion. Invar, at one specific temperature,
exactly cancels thermal expansion with a gradual phase change to a
lower volume phase. Low TC resistance alloys like Manganin and NiCrAl
exactly cancel tempco at one specific temperature with a gradual phase
change to a lower resistance phase. The further you get from the
temperature which is exactly compensated the worse the tempco in
either case. Specify TC very close to the compensated temp and you
can make it arbitrarily low .

Regards,
Glen

Thanks. I appreciate it much better with the explanation of how it
works.

 

[Archimedes' Lever]

On Thu, 13 Aug 2009 06:41:41 +0300, Paul Keinanen <keinanen@sci.fi>
wrote:

On Mon, 10 Aug 2009 22:05:42 -0400, clare@snyder.on.ca wrote:


The 6 amp motor means it draws 6 amps from the mains. It does not mean
ANYTHING as far as how much power it produces, other than that it
cannot produce more than 690 watts at 115 volts

Have you returned to constant current power distribution with 6 A
circuits ?

Arc lamps in the 1880's were specified by the number of amperes
(typically 6 A for street lighting). All lamps were series connected
and you could operate 20-25 of these in series from a 6 A DC generator
producing a 1000-1500 V DC loaded voltage. Thus, the voltage drop
across each arc lamp was about 55 V on average.

We have a winner.