So 1 inch of your wire would weigh ~0.0987 grams, so to measure down to 8.6350242338508 inches of wire your scale would need to weigh down to ~0.00000000000007 grams. Which is the weight of about a dozen atoms or so.
Grab a box full and test a bunch until you find one that works well for your use case. That way you end up with a resistor that’s much better than the rated tolerance you’d get if you just grabbed one resistor at random.
Real world resistors usually have a tolerance of ±5%, so you’ll never get anything that precise.
That’s why I keep a roll of 20 AWG nichrome on hand. Spool off 9.7195853528209 feet and it’ll be bang on.
So 1 inch of your wire would weigh ~0.0987 grams, so to measure down to 8.6350242338508 inches of wire your scale would need to weigh down to ~0.00000000000007 grams. Which is the weight of about a dozen atoms or so.
Yeah which is why you use a Kibble balance. Are you sure you’re cut out for this kind of work?
I’m not a scientist, I’m just in IT haha
I figured there was a way to measure that small of weight but I didn’t know!
Its akin to having an electon microscope in your kitchen
We move onto the next issue. How to precisely measure the length of the wire?
Eyeball it. Gotta squint right tho.
If you trust the gauging, you weigh it.
With a 6 digit voltmeter
With an ohm meter?
I’ve actually found 1% to be a lot more common nowadays.
Grab a box full and test a bunch until you find one that works well for your use case. That way you end up with a resistor that’s much better than the rated tolerance you’d get if you just grabbed one resistor at random.