Background in hard sciences, computing (FOSS), electronics, music, Zen.

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Joined 3 years ago
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Cake day: October 2nd, 2023

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  • Even if the switch ‘instantly’ completed the circuit, electricity does not move along a wire at the ‘speed of light’, but only about 66% of that speed. If the light contains a filament, it has to heat up to several hundres of degrees before it’s visible. Fluorescent takes longer; even an LED does not shed light ‘instantly’. So he was wrong on multiple counts. BUT they don’t teach such details in college (except in physics classes). AFAIK,most junior high ‘science’ teachers are not all that familiar with such details.


















  • kalkulat@lemmy.worldtoFuck Cars@lemmy.worldBatteries are expensive
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    4 months ago

    Wow, $600? I think you should expect a lot better range out of that battery!! Rechargeable batteries don’t like getting near ends of their range. 40 to 85% charge is about right.

    If the charger is cheesy or broken, it could be charging to 100% (or worse yet, not stopping) That would be bad, so you might replace the charger … making sure that the replacement is doing the right thing for you.

    I just watched a video where a Chinese taxi (car) battery was taken out of service after 800,000 km. (Probably in a couple of years!) That battery pack would have A LOT more cells in it, so the strain on each cell would be less. They’re expensive, so the charger is probably very high-quality.








  • If by ‘lunar success’ we mean taking pictures of the Moon’s surface, lunar orbiters have doing that for decades. If we mean going there and returning to the Earth, that was done by Apollo 8. So far, it was a successful test of new equipment to do the same old things. NASA has announced no clear plan for what will happen next … or for what purpose … unlike the clear plan to ruin healthcare and education for millions, science for 10s of thousands. Oh and to lie about how LLMs are ‘A.I.’ (which is at least 25 years in the future). Even Apollo was most successful at returning P.R. and not much else.