I'm a physicist. If you are an engineer that sounds like a "you" problem.
this post was submitted on 30 Mar 2025
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Not using the correct resistors does cause a U problem every once in a while.
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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.
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Rheostat, my dudes
Trimmable precision resistor.
Until finding out about finite measurement resolution
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.
Without using fancy components: Just simply adding a 6.2 and a 2400 Ohm resistor in parallel already gives you 6.18402 Ohm ⚡️
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.
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This guy looks like the dude from Programmers Are Human Too
I can assure you they are not.
It's been a while, but are ginger bread houses really that complex now?
Wait until they connect something to a battery.
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.
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.
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"
Eh, it's just fundamentally ugly to me and that really turned me off. Rounding doesn't help, that's like turning the lights off for sex to make it better. I still know the ugliness exists, even if I don't see it.
Engineering is still very cool to me, and I have huge respect for those who do it, but I'd never have made it. It's physics but even further perverted by reality. Math was beautiful to me because of how "pure" it was. Just straight logic, divorced from the messy world we live in. Tidy coefficients and elegant derivations.
I have to hard disagree with you there. The beauty of the math equations they test you with in school is completely artificially selected. The vast majority of math does not have nice neat solutions. There is a lot of it that doesn't have any solution at all. The beauty of engineering is figuring out how much of things you actually need. You might calculate that some quantity should be an irrational number for some design optimum, but the amount of precision you actually need will be some range around that. When you do that and see your design in the real world actually functioning, that's the greatest feeling in the world by far.
Not knocking people's choices, it just wasn't for me. If math in reality isn't math in education, it's even better that I left.
I'll still contend math is much more elegant than physics or engineering, though. There's no e^I*pi + 1 = 0 equivalent for either.
Using π = 4 is only a 27% safety margin, better go for π = 10 just to be safe.
Pi r square, square have 4 sides. No problem found.
Pi r not square. Pi r round. Cornbread r square
Behold, pies r square
Saw midwest.social, was not disappointed
Truly an ugly pizza. You can even see how dry and tough the crust is. And crust is like 90% of that thing.
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I actually really like physics, and it's 100% because I'm fucked up and evil
Respect. Physics is way up there in terms of hard science nerd cred.
the philosopher floating on a cloud: So how do you guys really know what's real?
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Quantum Ampere Standard
https://www.nist.gov/noac/technology/current-and-voltage/quantum-ampere-standard
.
there also been research for defining a quantum volt and quantumly stable resistors
https://www.nist.gov/noac/technology/current-and-voltage
Quantum-based measurements for voltage and current are moving toward greater miniaturization
P.S. :
https://en.m.wikipedia.org/wiki/Quantum_Hall_effect
Quantum Hall effect →
Applications →
Electrical resistance standards :
(...) Later, the 2019 revision of the SI fixed exact values of h and e, resulting in an exact
R~K~ = h/e^2^ = 25812.80745... Ω.
(this is precise to at least 10 significant digits)