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Cake day: June 10th, 2023

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  • ch00f@lemmy.worldtoxkcd@lemmy.worldxkcd #3106: Farads
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    6 days ago

    I used to teach AP physics to kids on the weekends. One asked me why Farads were so big. I had to explain that there’s a fixed ratio between Farads, Volts, and Joules. One of them had to be crazy big or crazy small.

    See also Coulombs.

    Caps are especially scary because they can develop their own charge through static electricity, so large value caps are often shipped with their terminals tied together.


  • Not so much overheating as dropout. Batteries lose both energy capacity and power capacity over time. If you draw too much current from an older battery, its voltage will drop significantly and possibly prematurely shut down the phone.

    Lowering peak current (by slowing down the phone), can prevent your phone from shutting off while it still has like 20% capacity left.

    Considering Apple was doing battery replacements for like $60 (before bumping to $100), and this was a setting that could be turned off, I think the only real crime was enabling it by default and not properly informing users.