Why are they called "resistors"

[Karen Stone]

Why do they call them "resistors"? When you connect two in parallel
each produces less resistance in the other.

Karen Stone

 

[tm]

We should call them "dodgers."

John

But can you find them in 0.1 % tolerance?


tm

 

[TheGlimmerMan]

Why do they call them "resistors"? When you connect two in parallel
each produces less resistance in the other.

Karen Stone

No. They both keep their same resistance, and the two of them together
add up to more current being passed, therefore the total resistance to
flow is less. The two in parallel do not act where one alters the others
value. That is not what happens.

It is more like having one "pipe for flow, and then adding one more
next to it. The one continues to flow, and the new addition also flows.
The total flow is more, so the "resistance" to flow has to be less.

The overall value of resistance to flow is less, even though both pipe
still flow just as they did alone.

 

[TheGlimmerMan]

Found a batch of 100 meggers, 0.1 tolerance, and fairly cheap (but
that was years ago).

Bullshit.

 

[TheGlimmerMan]

That wasn't a very Christian comment.

You are not qualified to make such an assessment, dumbass.

It didn't make sense, either.

See above, in spades!

I
guess you woke up and needed to type your favorite word.

You have more problems than greegor does. He is just a little twit
that never mentally exceeded adolescence.

You actually have hard wired problems that keep you from seeing the
world correctly.

Show me where a 100 Meg device was EVER sold at 0.1% tolerance that was
not a custom batch from a precision maker.

There were NO "off the shelf" houses for that stuff, so it IS total
fucking bullshit to claim that he found a "batch" for one thing, and that
they were "reasonably priced" for another, much ;less that they were
"found" when they most certainly would have to have been custom ordered
direct.

And finally the "that was years ago" makes it more ridiculous as they
were even MORE expensive then than later once processes improved. Both
cases were not cheap, and neither were ever "reasonably priced". Then,
there is that batch tolerance thing with values that high. Differences
in the epoxy dip can throw them off. mere "coffee breath" reduces the
things by tens of MOhms. The humidity level in the room affects the
reading even.

So, it was total bullshit.

You are an idiot.

Wake the **** up, dumbass.

 

[TheGlimmerMan]

Of course I am. I went to Bible school.

Bwuahahahahahha!

Read up on that part where Jesus stated that all one needed was faith
in him.

You lose, as usual.

You claim an education, yet demonstrate an utter lack thereof.

 

[Chieftain of the Carpet Crawlers]

You are not behaving anything like what Jesus
recommended.

You obviously do not know. Particualrly since you exhibit several
behaviors that qualify you for that statement even more than I.

But knowing the bible the way I do, I would never make that statement
about you, as it hat would then lower me to your level.

That is just *one* of your fallacies.

Note the nym I chose for this post.

Sadly, You and 85% of the other twits here will not get that.

Here are some hints, and then you can look up some lyrics and perhaps
get a clue.

The song to get the lyrics from is "The Carpet Crawlers".

There was once a time when honor meant more to a man than life.

You California fucktards are a big part of the reason that is no longer
true.

I merely live here, but I have seen what the bent mentality out here
has done to society.

Look at Snoop dog, the criminal retard for a perfect example of you
dumbfucks rewarding bad behavior.

Me calling you the dumbfuck that you are is NOT "bad behavior", idiot.
If you were not such an "It's all good" California dumbfuck convoluted
mentality twit, you might have the vision to see the damage bent brains
like yours does to a society.

 

[Chieftain of the Carpet Crawlers]

The only reason you profess to be a Christian, and believe in
reincarnation (a very un-Christian concept) is because you are
terrified of death.

More presumptuous horseshit, Johnny Shithead.

I am closer to Christ than you will ever be, you making a retarded
remark like that.

You know NOTHING about me, idiot.

 

[MrTallyman]

Of course I am. I went to Bible school. I passed the tests. I was
confirmed in the Church. You are not behaving anything like what Jesus
recommended.

The only reason you profess to be a Christian, and believe in
reincarnation (a very un-Christian concept) is because you are
terrified of death. That's the same reason, fear, why you hide behind
nyms, won't show your designs, can't do math, and are so profane and
hostile. cursing and scat fetishes won't grant you eternal life.



Explain this:

ftp://jjlarkin.lmi.net/Keithley_1gig.JPG

The blue thing on the Pomona is an epoxy-diped 1G resistor, stock from
Digikey. I tried breathing on it and the needle didn't move.

John

Obvious that you know nothing about HV.

There are literally decades of failure chronicles in the NASA archives
for failure modes.

What does your special meter read after you place a nice freshly wiped
across the nose greasy thumbprint on it?

If it does not move, it is not incorporating the proper excitation
potential to even be able to claim a valid test result.

It happens on both bare flatsos as well as the epoxy dipped versions.
And yes, that resistor you have on there is referred to as a 'flatso'.

Leave it to an utter idiot to rename a common device using the brand
name. You're an idiot, and I'll bet your lab is lame.

 

[Martin Riddle]

We should call them "dodgers."

John

Not Democrats?

 

[Jamie]

Hello Karen

Actually a (carbon) resistor is also a (semi)-conductor !

A 1 kilo-ohm resistor has a conductance of 1/(1000 ohm) = 0.001
siemens (historically designated mho)

A 2.5 kilo-ohm resistor has a conductance of 1/(2500 ohm) = 0.0004
siemens

When paralleling the above (1 kilo-ohm, 2.5 kilo-ohm) you get a
conductance of:

(0.001 siemens) + (0.0004 siemens) = 0.0014 siemens

If you want the resistance you inverse: 1/(0.0014 siemens) ca.= 714
ohm.

-

The above summation of conductances works for many more paralleled
resistors/(semi)-conductors !

-

Links for further reading:

Physics proporties:

http://en.wikipedia.org/wiki/Electrical_conductance

http://en.wikipedia.org/wiki/Electrical_resistance

Physics behind the above:
http://en.wikipedia.org/wiki/Valence_band

We do not yet know how a Superconductor works, but we use them anyway:
http://en.wikipedia.org/wiki/Superconductivity

-

Electrical components:

http://en.wikipedia.org/wiki/Electrical_conductor

http://en.wikipedia.org/wiki/Resistor

http://en.wikipedia.org/wiki/Semiconductor

http://en.wikipedia.org/wiki/Insulator_(electrical)

-

http://en.wikipedia.org/wiki/Multiplicative_inverse

Or just use "reciprocal" and don't waste your time looking at
all that crap..

Jamie

 

[TheGlimmerMan]

I did plaster it with ordinary fingerprints. No effect at all.

You *did* also touch it before testing. It has a blanket of your
stench sweat ooze on it, idiot.

You need to start with a freshly cleaned part. Hot 99% IPA will do it.
It takes less than 15 seconds in the mw oven to do about an ounce.

Clean it with that, and you should see it go UP.

Then, report back with your apology.

Oh... that's right... your instrument probably sucks. We'll see.

I have no idea what that means. I bet you don't, either.

So, you are telling the world that you have no clue about these parts
being sensitive to voltage stress? Do you even know what 'creepage' is?

I call it a "resistor."

I was referring to the term "pomona" you absolute ditz.

 

[TheGlimmerMan]

It's a 1G resistor. Why would it go UP?

It was lower from being dirty, dufus.

 

[TheGlimmerMan]

But it wasn't.

Yes, it was. If you touched it to attach it to the 'pomona' (not what
they are called, idiot). If you touched it to get it out of the
packaging as well. If you did not handle it wearing gloves, you very
likely reduced its value as read at it voltage limits. Their application
is HV. You taking LV readings on them, and touting those as its value is
a pretty funny tell about you.

But hell, you do not know how to use a VPD either.

After the HOT alcohol dip, did you place it in a 60°C vacuum chamber
for about ten minutes?

The surface epoxy coating can grab up some H2O. Wouldn't expect you to
have caught that.

You know very very little about HV resistors.

 

[TheGlimmerMan]

But it wasn't.

John

Yes, it was lower. Yes it IS dirty. Yes, that will lower a read
value. Yes, you are unable to know those elements as they are beyond your
grasp... obviously. It has been discussed at length, long before you
and your fucktarded test rig.

 

[TheGlimmerMan]

This part will probably have some small voltage coefficient, since
it's a thickfilm, so R will go down a little at high voltages. I doubt
that fingerprints will affect that, either. Fingerprints just don't
seem to be very conductive on a 1G resistor this big.

Do you not even know why a higher HV rating means that the form factor
has to change? There are three inch long inch wide versions of the part
you illustrated.

Jeez, dude. Think before you speak.

Regardless of any effect you think may or may not occur, you should
still never place values that high without sealing it up from being
"affected" environmentally, which is their biggest failure mode stat.
Pretty simple shit. Don't give it the opportunity to give you a failure
mode.

In your LV app, you should not even be using a flatso. axial leaded
versions are just fine and would drift less, and can be lead formed as a
small, smd device that stand a mm or so above its lead forms, further
removing any chance of VOCs or any other thing decreasing its value.

 

[TheGlimmerMan]

Are you trying to tell me that this "Archie" that everyone rags on is
(a) real, (b) trustworthy, and (c) allowed YOU to filch his address?
I think i wall accept if there are three or more confirmations of his
trustworthiness.

You, just as the greegor retard, have know knowledge of any form of
"worthiness" of any kind.

You could not garner three positive statements about the greegor retard
if you interviewed everyone he ever came into contact with in his entire,
pathetic life.

Not that you have the qualifications to discern any form of worthiness.
I confirm that you are almost as stupid as the greegor kook is.

 

[TheGlimmerMan]

In fact, I'll be using 0805 surface-mount parts. In ultra-high vacuum.

John

Must be a really lax spec then.

I would place thin slots *across* the span of the pad layout. I would
also adjust the pads to increase the distance between them, even to the
point of going outside the spec. Maybe a mil or two inside the
termination spread. Where it is usually far closer.

The slot can be filled with SMD adhesive, which will seal out VOC
incursions, and form a creepage barrier (an HV consideration).

Big flatsos are best untouched or simply potted, but small SMDs (of that
high a value)are better off being sealed away from the environment. Also,
you do not want you chamber to have any more water in it than it needs to
have. A sealed assembly has less total hygroscopy. All depends on what
you test set up in that chamber actually is.

Conformal coat isn't always fun, but transformer varnish practically
makes the thing monolithic.

 

[TheGlimmerMan]

No numbers, no facts, as usual. Just fuzzy ranting.

You have to have vision to see the numbers in that statement.

They refer to things grubby fucktards like you not only ignore, but are
blind to.

Ever heard of a VOC count, chump?

The machine ain't cheap, and I would BET that ALL of your assemblies
would FAIL it.

 

[TheGlimmerMan]

My measurements didn't change, clean or fingerprinted, within the
Keithley's resolution.

You are clueless.

I actually thought they would, but they didn't.

Proof that you are unaware of the efficacy, or lack thereof, of your
supposed "test gear".