Comments by "Anders Juel Jensen" (@andersjjensen) on "Asianometry" channel.

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  40. This is known and expected in the industry. And the usual way to get around it is that once people get good enough to work on the seriously important stuff they sign a period specific NDA in exchange for a golden handshake and a looong vacation when they leave. The lead times in the high tech fields is often close to five years. So just being cut out of the loop for 18 months before you're allowed to work in the exact same field for someone else pretty much takes the sting off. You'll have fallen enough behind, and you'll end up in the middle of a product development cycle when many things are already set in stone, or you'll end up at the beginning of a product development cycle with 18 months old info. My buddy is a sales engineer at a crane company. If he gets fired he will get 70% of his salary for 12 months (on top of his new salary), but cannot work with price projecting of crane projects. That doesn't mean he can't work on, say, designing a new hydraulic system for some specific type of crane. He just can't work for a competitor in a way that would put his former employer at a serious disadvantage. Being able to undercut every contract bid by precisely 0.5% (knowing the internal prices of the former place by heart) would not only be unfair to his former job, but also unfair to the customers who expect bids to be given "blind". Each company has to guess at the level of competition they think they are facing and make a competitive bid. Not doing so is considered price fixing. But in the above case it would effectively be price fixing for the customer and a practical monopoly for the new employer.
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  49. You're right, but the way you worded the second part it becomes hard for laymen to understand that when you say "charges" you're not referring the act of "charging up the battery" but rather referring to "the amount of Coulombs". So for anyone curious: Watt (rate of electricity consumption) = Joules/second ("energy chucks per time unit") Watthours (total electricity consumption) = Joules/second * 3600 seconds (so the seconds cancel out and you're left with 3600 Joules) However, Watt is also equal to Volts * Amps (sorry physics teachers for the laymanified notation). This means that when you have a, say, 3.7V battery rated for 1000mAh of capacity you just multiply the two to get it in mWh, which in this case is 3,700mWh. Then divide by 1000 to remove the "milli" part and you're left with 3.7Wh, or divide by 1000 again to get to the kWh you're used to from your electric bill. In this case 0.0037kWh. But here's the catch: What I just said is complete nonsense... Because a battery does not deliver it's rated voltage from 100% to 0% capacity. The voltage will decline as the battery discharges. This means that you will, in fact, not get 3.7Wh our of the example above. The battery will start at 3.7V but end at around 2.2V (I'm using my Vape battery as an example) before it's sufficiently "flat" to not be able to drive my "device". And that's the reason why battery capacity is measured in amp-hours (or milliamp-hours for small stuff), as the Watt-hour approach "is bogus" despite it looking more familiar. You can, however, go V * mAh * 3/4 and get a reasonable approximation for modern lithium batteries. "The constant" will change depending on the battery technology, but I've rambled on for long enough, so I'll spare you all for a lecture on the implications of a battery's internal resistance and how that directly relates to Ohm's Law.
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