R
Rich the Newsgroup Wacko
- Jan 1, 1970
- 0
I read in alt.binaries.schematics.electronic that Don Klipstein
Well, they MAY be, but there are many alloys with much lower TCRs.
Constantan is one,
Is that mined in Constantanople?
I read in alt.binaries.schematics.electronic that Don Klipstein
Well, they MAY be, but there are many alloys with much lower TCRs.
Constantan is one,
No, but it's used for making istanbullets.Is that mined in Constantanople?
I read in alt.binaries.schematics.electronic that Rich the Newsgroup
No, but it's used for making istanbullets.
"Constant resistance since 1453".
I read in alt.binaries.schematics.electronic that Rich the Newsgroup
No, but it's used for making istanbullets.
Don Klipstein said:A coil on a resistor body will heat up more than a few inches of wire in
open air.
Air cooling is less when the wire is on a surface. In addition,
probably more significant, is wire turns on a resistor body being heated
by heat from adjacent turns of the coiled winding.
Sounds to me, Don, a lot like the tungsten wire in a light bulb. ;-)
Don Klipstein said:That's a more difficult part, given temperature coefficient of
resistance of copper! How to measure cold and when in use? Maybe
make a resistor measuring only a little low ehen cold, and see what it
does when in use, and improve from that!
- Don ([email protected])
I've since gone to the larger 36 AWG, which is a bit under 3 inches for
a tenth of an ohm. So no problem.
Don Klipstein said:One thing to keep in mind:
Wirewound power resistors are typically made with nichrome wire, which
has an unusually low temperature coefficient of resistance about half that
of copper and most other metals.
And, IIRC, it's also a lot more difficult to solder.
Don Klipstein said:This is opposite of what should be the truth. Copper wire has
resistance increasing with temperature, roughly proportionately with
degrees K.
Looks like you have some measurement error.
I think what's happening is when I pinch it with my fingers, I'm cooling
it, not warming it.
John Woodgate said:I read in alt.binaries.schematics.electronic that Don Klipstein
Well, they MAY be, but there are many alloys with much lower TCRs.
Constantan is one, and Eureka is similar. Manganin has very nearly zero
TCR and is used for high-precision resistors.
Ban said:Really, I don't know what this is all about, every bit of the "experiment"
can be predicted by anybody, so WTF is the OP doing?
Rich the Newsgroup Wacko said:Is that mined in Constantanople?
John Woodgate said:I read in alt.binaries.schematics.electronic that Rich the Newsgroup
No, but it's used for making istanbullets.
Thanks, J.F. You're beginning to sound like Toak/Nunya whatever. I'm
just trying to share my experiences with others. If you don't have
anything constructive to say, then I invite you to make no comments.
But then we all know that you wouldn't take my invitation seriously.
Have a nice day.
<buzzards circling overhead..>