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Joined 1 year ago
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Cake day: February 1st, 2024

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  • Is that true though? As in, is it really that dangerous? It seems that you’ll dissipate power equal to the inefficiency times the nominal charging power, so something like 5V x 2A x inefficiency (inefficiency being 1-efficiency), which will probably be of order a watt.

    I can use my car battery to charge itself without any issues — I just plug the red terminal to itself, and same with the black, which is to say, a battery is always connected in a way that “charges itself.”

    I think the key is that the battery probably isn’t really playing a big role in OOP’s setup — electricity doesn’t “go through the battery,” it just goes from the charging input to the power output circuits, with the additional power (due to inefficiency) being provided by the battery.


  • I’m not sure though — the power output and the charging input are both regulated and (almost certainly) current limited. So I think (not positive…) that you’re basically dissipating your power in the inefficiency the charging and output circuits, with this power coming from the battery.

    The inefficiency should (I think…) just be the round-trip inefficiency of the charging/discharging of your power bank — this should be way, way less than the short-circuit power dissipation.

    The simplest toy model is to take a battery and try to charge itself. So you put jumpers on the + terminal and you connect those to the + terminal, and same for - (charging is + to +, NOT + to -). But this is silly because you’ve just attached a loop of wire to your terminals, which is equivalent to doing nothing. With charging circuits in between things get much more complicated, but I’m not sure if it goes full catastrophic short…


  • For 75kg (roughly average South Korean male weight) and 7" step height (standard in the US I think, not sure about Korea), this is about 0.13kJ/step.

    By coincidence, the human metabolic efficiency is (roughly) the same as the conversion between kJ and food (kilo)calories, meaning this would be (very roughly) 0.1 calories/step.

    Not much, given a single French fry is maybe 5-10 calories. But it’s better than nothing!



  • Olive oil is delicious, and I’ve always loved acidic foods — so long as there’s yummy dressing on the salad, sign me up.

    Just get in the habit of making simple dressing, e.g., EVOO, red or balsamic vinegar, Dijon mustard, salt & pepper. (Mustard helps with emulsification.) Yes oil is caloric, but afaik this is much healthier than drowning your salad in ranch or Thousand Island or whatever.

    Olive oil can make you feel full, too, so even though you’re eating fat, it can be a net win.

    A Mediterranean diet is delicious, vegetarian/vegan compatible and, I think, fairly healthy. But mostly it’s the delicious that counts.








  • qjkxbmwvz@startrek.websitetoFunny@sh.itjust.worksVroom vroom!
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    1 month ago

    Hmmm, I’m not sure I understand…

    A large explosion every second has units of power, not energy. So to me this is suggesting that the train is putting out power equal to its kinetic energy per second. That’s certainly not the case — it implies that the train is powerful enough to accelerate to the speed in 1s, which is definitely not true.

    But that’s just my interpretation.





  • Immich looks particularly good to me.

    It is! Been running it for a few years now and I love it.

    The local ML and face detection are awesome, and not too resource intensive — i think it took less than a day to go through maybe 20k+ photos and 1k+ videos, and that was on an N100 NUC (16GB).

    Works seamlessly across my iPhone, my android, and desktop.