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Three-Phase posted:Wow, I had no clue that they made CF cards that were that fast. They’re still common in professional camera, where high write speed matters. CF cards are slowly on their way out. It’s a petty reason, but I’m going to miss them because I like their size. They’re easier to handle than SD cards, but they’re still small enough that they take up an negligible amount of space compared to the equipment with which I use them.
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Sep 23, 2013 01:47
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| # ¿ Apr 27, 2024 14:32 |
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Kilowatt‐hours in general are kind of dumb when joules exist, but at least I’ve never seen someone misuse the “kilo‐watt” like that before.
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Dec 24, 2013 02:31
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Two Finger posted:You need to tell me more about this amazing unit NOW. In ye olden days, if you wanted something cooled significantly below room temperature, your only option was ice. For millennia, only kings could afford to have ice hauled from distant locales to chill their beverages, but in the nineteenth century harvesting, storing, and delivering ice year‐round became a major industry. If you wanted your building cooled (generally because it was a warehouse storing perishable food), you could contract with the ice company to deliver x tons of ice to you every day. You just let the blocks of ice sit around and melt, cooling your stuff in the process. That’s where ton comes from in refrigeration context: it’s the amount of cooling provided by one short ton of ice, delivered daily. When mechanical refrigeration came along and you decided to modernise your warehouse, you replaced daily deliveries of x tons of ice with an x‐ton refrigeration unit. This makes it a unit of power. I have a 0.024‐ton computer. If you think about it, it’s no weirder than bomb megatons. Only a few hundred tons of TNT have ever been gathered in the same place and detonated, but that doesn’t stop us from extrapolating to rate atomic bombs. Platystemon fucked around with this message at 16:49 on Dec 28, 2013 |
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Dec 24, 2013 16:15
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Note to self: don’t pull too hard. 
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Dec 29, 2013 13:45
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Here is a very thorough answer to the question.
Platystemon fucked around with this message at 07:44 on Aug 17, 2014 |
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Aug 17, 2014 03:27
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Wikipedia’s article on “Amtrak's 25 Hz traction power system” is extensive, if you’re interested.
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Jan 8, 2016 13:35
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DaveSauce posted:The other question is, is NO-OX-ID actually conductive? The meter says no, but I don't know if that's really a valid test. Wire it to a bench supply at a reasonable voltage and meter off that.
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Feb 8, 2016 15:23
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It has always bothered me that my car has a GPS receiver that knows the time to the nanosecond, yet is unable to share this information with the clock the car shows me.
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Sep 2, 2016 11:17
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kastein posted:Setting a clock from the GPS second-of-week is trivial - if you know what timezone you're in and in some cases, whether your county observes DST. Setting the date from GPS is somewhat less trivial. There’s a service menu I can pull up on the navigation system that shows the correct time in human‐readable format. I think in UTC, but it’s been a while since I pulled it up so perhaps not. So the navigation system’s programmers already took care of that. Guy Axlerod posted:Is the frequency of the grid still adjusted at night to ensure a correct daily average for clocks that use the 60 Hz (or 50 Hz) signal as a reference? Timekeeping seems pretty related to industrial electricity. Not at night, but yes, at least for most grids. The Western Interconnection did a study a few year ago about “how much poo poo will break if we stop making time corrections?”. They’re back to correcting, but only when grid time drifts ±30 seconds from true time (used to be ±2 seconds).
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Sep 3, 2016 00:58
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Delivery McGee posted:Do enough people still use those clocks to make it worth the effort? What else is there that's dependent on the line frequency? (In the US, specifically -- I wouldn't be surprised if PAL gaming consoles/TVs still base the system clock on the line freq, because The problem isn’t the old punch clocks you know about; it’s all the old equipment tucked away somewhere that you don’t. Equipment was designed with the expectation that the power grid would keep them within thirty seconds of GMT forever. That wasn’t an unreasonable assumption at the time. Before TCP/IP, before GPS, before cheap, accurate quartz timers, the powergrid was by far the best option for timekeeping.
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Oct 28, 2016 06:31
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)
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SMILLENNIALSMILLEN posted:Once I held a lights witch in the middle neither on or off while watching a TV Don’t do this. Switches like that are specially designed to minimise arcing. By intentionally making them arc, you are drastically shortening the switch’s lifespan, and potentially creating a fire hazard.
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Dec 29, 2016 08:13
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Those are some aggressively dead dudes.
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Jan 7, 2017 07:58
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FAT CURES MUSCLES posted:I feel like this is as good as a place as any to ask: It’s harmless phenomenon that’s a consequence of the design of the power supplies. Your mains wiring has nothing to do with it. If you’re using name‐brand chargers, you have nothing to worry about. If you really want the effect to go away, using grounded (three‐prong) chargers ought to eliminate it. Platystemon fucked around with this message at 11:11 on Mar 30, 2017 |
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Mar 30, 2017 11:07
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https://www.youtube.com/watch?v=vWRaU9zMVyU&t=1353s There’s this one. Not as exciting as you imply, perhaps.
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Jun 14, 2017 05:35
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https://www.youtube.com/watch?v=OEoazQ1zuUM&t=325s Explosion @ 6:30.
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Jun 14, 2017 05:39
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| # ¿ Apr 27, 2024 14:32 |
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I think it’s grease.
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Oct 24, 2017 20:08
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