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Cake day: June 10th, 2023

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  • Batteries have both electron capacity (cumulative) and current capacity (rate) ratings. The chemistry and size determine how many electrons (aka Amperes times hours) can be stored, and the conductor sizes (including within the cells) determine how quickly it can be charged or discharged in sustained operation (without permanent damage).

    A car battery can be shorted with a screwdriver and discharged at a high current, but only for a short time without damage to the cells. A 100Ah car battery can supply rated current for roughly twice as long as a 50Ah battery.

    Sometimes people call these ratings energy and power ratings by multiplying each by rated voltage, but the voltage does vary with charge state and rate of current flow so those “ratings” are rather approximate.


  • “power is only related to voltage” is nonsense. Current and voltage contribute equally to power (P=IVpf, but I am not going to discuss power factor here).

    The reason current is less frequently mentioned is that our electric power system supplies power (current and voltage) to many users and the wiring for giving power to many locations is simpler and more reliable when we try to keep voltage relatively constant and let the power using devices demand just as much current as they need to extract the power they need. This means current values can vary wildly between circuits, so it is not very informative to talk about current unless you know a lot about what is hooked up and consuming power nearby. The circuit that supplies the lights uses much less current than the one that supplies the air conditioner (when it is on) but there are often many lights on a single circuit so the current is quite different in different segments of wire even while the voltage only varies a but in each circuit.

    You could devise a wiring system that held current constant by running the current in a loop through all the consuming devices, but like Christmas tree lights if any load disconnected then all the loads would stop receiving power, which would make it very unreliable.




  • For those not in the know… PDF is a particular set of conventions for delivering peograms written in a programming language called “Postscript”, and like all programs they can be hijacked to trigger unexpected results, including the delivery of software viruses. And yes, while those programs run in “sandboxes” that are supposed to prevent propagation of harm, such environments can fall in that purpose due to creative triggering of imperfections in the sandbox code by the “contained” Postscript code.

    Hence, quotes are used to convey lack of trust in the claim of safety.


  • Boss has different people for different functions within the company. A monoculture is more susceptible to systematic flaws, but it is also less expensive to maintain. It is not OPs place to decide how the company manages is computing facilities, so if WSL or Cygwin are not accepable compromises (OP and company have to both agree) then OP has to decide whether they are willing to go along with Windows or find another job.

    Something to talk about during the exit interview anyway.