this post was submitted on 30 Mar 2025
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[–] FreeBeard@slrpnk.net 70 points 6 days ago (5 children)

I'm a physicist. If you are an engineer that sounds like a "you" problem.

[–] SnekZone@lemmy.blahaj.zone 36 points 6 days ago (1 children)

Not using the correct resistors does cause a U problem every once in a while.

[–] nilclass@discuss.tchncs.de 10 points 6 days ago

Or an I problem, depending on your perspective

[–] GreatAlbatross@feddit.uk 18 points 6 days ago (1 children)

Sounds like a 6 ohm resistor solution.

[–] interdimensionalmeme@lemmy.ml 10 points 6 days ago

They're 5.6 or 6.8 ohms usually

[–] captainlezbian@lemmy.world 8 points 6 days ago

OK, the solution is "how accurate will make the physicist and accountants both only kinda mad"

[–] InternetCitizen2@lemmy.world 7 points 6 days ago (1 children)
[–] Nalivai@lemmy.world 14 points 6 days ago

This is also a "you" problem. Fix that at your earliest convenience.

[–] slackassassin@sh.itjust.works 3 points 5 days ago

Too true, and my problem is about to be your problem and the cycle continues comrade.

[–] abcd@feddit.org 77 points 6 days ago (1 children)

Without using fancy components: Just simply adding a 6.2 and a 2400 Ohm resistor in parallel already gives you 6.18402 Ohm ⚡️

[–] Cornelius_Wangenheim@lemmy.world 28 points 6 days ago (3 children)

Real world resistors usually have a tolerance of ±5%, so you'll never get anything that precise.

[–] lemming741@lemmy.world 38 points 6 days ago* (last edited 6 days ago) (6 children)

That's why I keep a roll of 20 AWG nichrome on hand. Spool off 9.7195853528209 feet and it'll be bang on.

[–] Lv_InSaNe_vL@lemmy.world 5 points 6 days ago (1 children)

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.

[–] lemming741@lemmy.world 10 points 6 days ago (2 children)

Yeah which is why you use a Kibble balance. Are you sure you're cut out for this kind of work?

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I've actually found 1% to be a lot more common nowadays.

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[–] frezik@midwest.social 44 points 6 days ago (5 children)

That level of precision in a resistor would literally be thrown off if you breathed on it. If you actually needed that, then you need to build an extremely controlled environment around it. Even then, the heat from the electricity itself would throw it off. Maybe in a liquid nitrogen bath?

[–] Zron@lemmy.world 20 points 6 days ago (1 children)

First, assume a spherical resistor in a vacuum, that can also dissipate heat with 100% efficiency.

Now that we’re in physics land, anything is possible.

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[–] MehBlah@lemmy.world 24 points 6 days ago* (last edited 6 days ago)

Its funny the first thing I thought of was, at what temperature.

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[–] deranger@sh.itjust.works 53 points 6 days ago (4 children)

Numbers like that are why I quit majoring in mechanical engineering. Physics took the beauty of math and made it ugly.

You knew something was wrong in calculus when you got a fucked up coefficient that wasn’t a nice number.

[–] empireOfLove2@lemmy.dbzer0.com 54 points 6 days ago (5 children)

Numbers like that should have been why you kept going in mech E.

Once you get past the educational stage, every one of those calculations becomes "OK now round to the closest whole number that gives you the larger factor of safety and move on"

[–] LostXOR@fedia.io 35 points 6 days ago (3 children)

Using π = 4 is only a 27% safety margin, better go for π = 10 just to be safe.

[–] demunted@lemmy.ml 21 points 6 days ago (1 children)

Pi r square, square have 4 sides. No problem found.

[–] PrimeErective@startrek.website 13 points 6 days ago (1 children)

Pi r not square. Pi r round. Cornbread r square

[–] DragonTypeWyvern@midwest.social 17 points 6 days ago (2 children)
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[–] JuxtaposedJaguar@lemmy.ml 10 points 6 days ago (1 children)

The trick is to round everything. Pi? Basically 3.

[–] GoatTnder@lemmy.world 8 points 6 days ago (1 children)

I've heard a story (so like 4th hand at this point) where an astrophysicist was talking about galaxy rotations or something. "And for this model, we can simplify pi to 10."

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[–] kayzeekayzee@lemmy.blahaj.zone 14 points 6 days ago (1 children)

I actually really like physics, and it's 100% because I'm fucked up and evil

[–] deranger@sh.itjust.works 28 points 6 days ago (1 children)

Respect. Physics is way up there in terms of hard science nerd cred.

[–] PropaGandalf@lemmy.world 12 points 6 days ago (1 children)

the philosopher floating on a cloud: So how do you guys really know what's real?

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[–] andros_rex@lemmy.world 10 points 6 days ago* (last edited 6 days ago)

After calculus though, they just expect you to cope with fucked up coefficients. In Diff Eq, sometimes you do just get something like 3/111 cos (6/111 x). It gets harder to come up with examples that work out with nice integers.

Physics can also have some really beautiful math, look at Lissajous figures. Once you understand the connections between e, the imaginary plane, and sine/cosine, you get some profound understandings about how electric and magnetic fields work.

[–] unemployedclaquer@sopuli.xyz 37 points 6 days ago (2 children)

i miss old school radioshack. i did not know what all those bins of tiny electronic hobby parts were for, but I desperately wanted to learn. I did eventually but you have to get all your stuff from some shady oligarch.

[–] tacobellhop@midwest.social 16 points 6 days ago

Yeah we’re living in the ruins of the old America already and have been for like 25 years.

It’s dirty they just use the same business names they did in the 20th century. While making smoke and mirrors versions of the old products.

[–] dejected_warp_core@lemmy.world 8 points 6 days ago (1 children)

i did not know what all those bins of tiny electronic hobby parts were for, but I desperately wanted to learn.

From what I understand, prior to the personal computer boom of the 1980's, HAM radio was kind of a big deal with nerds. The parts were there for all manner of electronics tinkering, but a big mainstay was building and modifying radios. Yeah, you had people tinkering with computers in the 1970's too, but it was more niche (until it wasn't).

[–] unemployedclaquer@sopuli.xyz 2 points 2 days ago

I’m fond of the gentle expert dudes who are so old they heard about the mad Max signal intrusion that day

[–] hardcoreufo@lemmy.world 11 points 6 days ago

The only application I can think of off the top of my head that would require that precision is a R2R DAC.

Just sort through a bin until you find one.

[–] Allero@lemmy.today 10 points 6 days ago (2 children)
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