Comment on Virgin Physicists

abcd@feddit.org ⁨4⁩ ⁨days⁩ ago

• Cornelius_Wangenheim@lemmy.world ⁨3⁩ ⁨days⁩ ago

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

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  • lemming741@lemmy.world ⁨3⁩ ⁨days⁩ ago

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

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    • Lv_InSaNe_vL@lemmy.world ⁨3⁩ ⁨days⁩ ago

      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.

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      • lemming741@lemmy.world ⁨3⁩ ⁨days⁩ ago

        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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    • Opisek@lemmy.world ⁨3⁩ ⁨days⁩ ago

      We move onto the next issue. How to precisely measure the amount of wire?

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      • ZombiFrancis@sh.itjust.works ⁨3⁩ ⁨days⁩ ago

        Eyeball it. Gotta squint right tho.

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      • lemming741@lemmy.world ⁨3⁩ ⁨days⁩ ago

        If you trust the gauging, you weigh it.

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      • interdimensionalmeme@lemmy.ml ⁨3⁩ ⁨days⁩ ago

        With a 6 digit voltmeter

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      • piecat@lemmy.world ⁨3⁩ ⁨days⁩ ago

        With an ohm meter?

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  • duckythescientist@sh.itjust.works ⁨3⁩ ⁨days⁩ ago

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

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  • WolfLink@sh.itjust.works ⁨3⁩ ⁨days⁩ ago

    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.

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