Comments by "seneca983" (@seneca983) on "Technology Connections" channel.

  1.  @SchlossRitter  Japanese is helped by the fact that it uses logographic script (kanji) for a significant part of the text. I think Thai is probably an even more striking example because the Thai script is not logographic.
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  2. In Finnish it's "hehkusukka", lit. "glow sock".
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  3. Just remove your CO monitor. Then you can rest in peace.
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  4. @John Jenkins "Electrician here, good theory on why wires are uncoiled before use but not the actual reason. If youve ever seen the windings inside a transformer or (electric obviously) motor, you can probably reason out why" I'm fairly sure you're mistaken here. A coiled extension cord has a wire running in both directions so they will cancel out unlike the windings in a transformer or a motor. (And even if that were an issue the heat dissipation issue would still also exist.)
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  5. Though the subtitles render it as "NEMA toads".
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  6.  @PhiloSage  I was responding to comments that talked about the EM field. Of course, the resistance doesn't cancel but leaving the extension cord coiled doesn't increase the resistance (though it can reduce heat dissipation).
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  7.  @hairyairey  That's because a coiled cable can't dissipate heat as well as an uncoiled cable.
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  8.  @joshuaewalker  "We, United States, get a single phase at the residential level of 240 volts. Throughout most of the home only 120 volts are used. We use 240 volts on dedicated circuits for water heaters, ovens, clothes dryers, HVAC systems, and electric car chargers." I think the point was the following. In the US the voltage of a single phase relative to neutral is 120V but you can also use two live wires with opposite phases to get 240V when you need a higher voltage. Similarly in Europe, the voltage of a single phase relative to neutral is 230V but you can also get 400V if you use two live wires with phases 120° apart if you need a higher voltage. This isn't like using a 3-phase motor because it's not using all the 3 phases. It's just using 2 of the phases for a higher voltage. (I agree that you probably don't need all 3 phases at home for any appliance.)
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  9.  @Jdbye  "I always thought it was because a coil of wire is essentially an electromagnet and current passed through it will cause a magnetic field" This is not a huge issue because in a coiled extension cord you have wires running in both directions meaning they mostly cancel out.
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  10. The phlogiston theory is rather old fashioned. I think this newfangled caloric theory is more credible.
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  11. Also, naphtha shouldn't be confused with naphthalene which is the main component of traditional mothballs.
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  12. Wind turbines are just propellers in reverse!
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  13.  @sleeptyper : In Finnish "kapasitori" is also used in addition to "kondensaattori".
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  14.  @MayContainJoe  "Hot air heating itself is very inefficient compared to using water as a conductor to radiate heat" Why is that? Sounds counterintuitive.
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  15.  @travelinghermit  "That's because air is an insulator." But even with a radiator, you're still going to have air between you and it.
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  16. The mending has only started. Have a look at this graph. https://ozonewatch.gsfc.nasa.gov/facts/history_SH.html
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  17.  @reasonsvoice8554  Eddy currents have nothing to do with it.
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  18.  @reasonsvoice8554  In a coiled cable you have a wire running in both directions so they will cancel out. That's not the case for a coil in an induction heater.
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  19.  @reasonsvoice8554  "It doesn't have to be coiled. Magnetic fields will be created as long as you have a current through a wire." Yes, but I was responding to comments about why it says on cables to uncoil them for use. It's about heat dissipation. "Coiling may make the field strength stronger." But it doesn't in this case because the cable has two wires running in opposite directions.
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  20.  @joshuaewalker  The split phase basically becomes two phases that are 180° apart when taken relative to the neutral that's taken from the middle. There's no functional difference to 2-phase power from the consumer's point of view. But if you still don't accept my wording forget this and let me rephrase what I said. In the US, you get 120V when you use a live wire and a neutral wire but you can get 240V if you use two live wires. In Europe, you get 230V if you use a live wire and a neutral wire but you can get 400V if you use two live wires (that are in a different phase). The latter isn't really using 3-phase power because it's only using 2 of the 3 phases (for a higher voltage). I think this is what the earlier comments were referring to, not using 3-phase power at home.
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  21. Btw, how common is district heating in the US? I've seen some comments saying that NYC has district heating. Is it the only place or are there others?
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  22. "But if I ever get an EV, I'm going to have to try to convince the rest of the building to invest in a rewiring project." Can't you just give an estimate of electricity usage and offer to pay according to it (assuming the wiring can take it)?
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  23.  @mjc0961  Yeah, I was just thinking of one (or maybe two cars). If more people want to charge EVs then there's a much better chance of getting enough people to agree to do the necessary installation. In fact, without those it's likely worse than you describe. Too many EVs will likely blow a fuse or trip a circuit breaker which will halt charging entirely.
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  24.  @freeculture : But 60hz means more transmission loss in wires.
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  25. That's not a bad solution.
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  26. If there's really going to be "one cable to rule them all" the connector needs to be fairly thin, like USB-C, so it's good for the thinner phones. TOSLINK seems too thick for that.
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  27. I bet its heat output is a fraction of 1500 W.
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  28.  @roseroserose588  "it is a shame to see the structures go" Aren't they kind of ugly?
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  29. I think the smell of vinegar is kind of nice.
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  30.  vbddfy euuyt  What's worse, the architect (Viñoly) had already made the same mistake before in Las Vegas but he thought that London would be cloudy enough that it wouldn't matter.
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  31.  @joshuaewalker  I meant it's 120V relative to the neutral wire.
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  32.  @joshuaewalker  "it is not functionally the same as "two phase power"" What's the functional difference then? I maintain that there is none. This doesn't matter anyway since in my previous comment I provided an alternative wording that doesn't use the word "phase" (when referring to the US) so that should make it clear what I meant. "So, when we need 240 volts we do not combine those two separate legs we simply use the normal 240 volt single phase that is coming into the house" Those two are the same thing. You can't combine those two in a way that would be different from using the whole 240V phase.
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  33.  @joshuaewalker  "I think we're actually on the same page so I'm not sure where the argument is anymore." It seems to me what we argued about was wording but that's not what my original reply to you was about. In your comment responding to a comment by VorpalGun (which mentioned 3-phase power) you wrote: "Frankly, other than 3-phase motors, I don't see where having 3-phase power would ever be needed or useful at the residential level." Here's my reply: In the US, you get 120V between a live and a neutral wire but you can get 240V between two live wires (disagreement causing words avoided in here). In Europe, you get 230V between a live and a neutral wire but you can get 400V between two live wires (of different phases of 3-phase power). I think this higher (400V) voltage one can get is why he mentioned 3-phase power rather than "really" using 3-phase power (i.e. using all 3 phases in an appliance).
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  34.  @joshuaewalker  I'm just speculating here but maybe they use all three phases because it might be easier to just wire all three phases to the device if needs more than one phase and it doesn't have to use normal outlets or maybe taking in all the phases results in a more balanced load for all the phases. Obviously, at least resistive heating elements don't need all 3 phases in the same way as some electric motors. I was curious and I checked my breaker table and the stovetop seems to have a 3-pole breaker so it's presumably taking all 3 phases but I suspect none of the individual hot plates uses all 3 phases because I have an induction stovetop I'm not sure how that could work. Also, at least my washing machine is plugged into a normal outlet so it's using just a single phase and 230V. It would sound a bit weird to me if a consumer-grade washing machine would require 3-phase power though I can't be sure that it doesn't happen somewhere.
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  35.  @whitetomato  But in Arabic script, if I'm not mistaken, the letters that are at the ends of a word look different from the ones in the middle which basically marks the word boundaries just like a space between block letters. I'd guess that if you wrote Arabic (or Farsi or Urdu) like each line was a single long word it would be similarly hard to read like old Latin or Greek without spaces.
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  36. They're inefficient.
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  37.  @isaackarjala7916 : Whatever one should think of banning incandescent bulbs, I don't think basements should affect that decision very much.
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  38.  @flagmichael : "Blood was shed to gain independence." Not really, or at least not in the way you might think. We didn't have to fight to get our independence. That allowed us to skip right to the civil war part.
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  39.  @kornaros96  But trying to do the reverse would be more problematic.
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  40.  Charlie K : Wikipedia says: " The capacitor was originally known as a condenser or condensator." meaning both are/were used. https://en.wikipedia.org/wiki/Capacitor
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  41. 1:00 I have to object here a bit. Heat pumps do create heat in addition to moving it. If a heat pump didn't create any heat it would have an infinite power coefficient. The laws of thermodynamics don't allow that when moving heat from colder place to warmer place.
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  42. 17:30 "It would be great if we could develop some sort of selectable Low-E window. Maybe the glass could be reversible so it reflects short and medium-wave IR only on one side." I think that kind of reversible window is impossible. The reflectivity has to be the same in both directions because physics is time-symmetric.
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  43.  @slipperyavocado9457 : It goes to heat.
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  44.  @slipperyavocado9457 : But I don't quite understand why you're asking that.
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  45.  @slipperyavocado9457 : I guess (though he might run into a problem of the motherboard not having slots for enough GPUs or many PC power sources not being rated for 1500 W). However, I don't see what that has to do with my comments. I was just nitpicking about the fact that while heating his room this way can have the added benefit of also performing possibly useful computations, it doesn't make sense to count that into the efficiency in the form of a percentage of the power consumed.
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  46.  @hairyairey  My point was that air not being good at conducting doesn't (seemingly) make any difference since a radiator also has to conduct the heat into the air (and inside ducts the heat moves by convection, not conduction).
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  47. Have you seen those autonomous cars with googly eyes? Maybe that will get us back to friendly looking cars. I think those cars should have a smile or a grin between the eyes for good measure.
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  48. If the noise is a problem why not make an AC using Peltier elements instead of a compressor. As a bonus, the thing becomes even more inefficient. Who cares about money or the environment anyway?
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  49. 20:55 If you don't want to burn fossil fuels inside your home you could always get an old fashioned wood-fired oven/stove. :)
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  50.  @FaradayBananacage  I think that's less of a problem than word boundaries not being marked. Of course, you could use some other glyph to mark sentences or clauses.
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  51. What I do with tablets is that I break a corner off an throw that in the tub. Is that a good idea?
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  52.  @larsalfredhenrikstahlin8012  "You should be able to plug un-grounded things into grounded outlets." Monkeh wasn't complaining about being able to plug ungrounded things into grounded outlets but rather about being able to plug grounded things into ungrounded outlets.
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  53.  @Monkeh616  "CEE 7/2 ungrounded plugs cannot be inserted into 7/3 or 7/5 grounded outlets." But that problem probably isn't widespread. I think CEE 7/2 is quite rare and unearthed devices are more likely to use CEE 7/17 or Europlug which do fit into those outlets. However, it might be a safety issue if e.g. CEE 7/4 plug fits into some unearthed socket like CEE 7/1. Thought this was what you were complaining about in your first comment in this thread and if so I agree.
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  54.  @vurpo7080  "Schuko, the one used in most of Europe, has basically all the benefits of the UK plug" Schuko lacks the fuse in the plug which the UK plug has.
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  55. Note that at best you could use this argument for incandescent bulbs if your heating is electric. If your house uses district heating (which is mostly used here) or is heated e.g. with oil, that's going to be more efficient than electric heating when factoring in the losses in the electricity generation.
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  56. You can think of the "+" and "-" applying to one specific part of the cycle.
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  57. Is that legal?
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  58. To nitpick a bit, I think this is an issue of knowledge (or sometimes laziness), not skill. These tips aren't hard to do at all. People who don't do them most likely just don't know about them (or can't be bothered if they do).
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  59. That sounds a bit odd to me. If the heat ruins the taste of the coffee over time it shouldn't matter if it's heat coming from a hot plate or heat retained from the brewing.
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  60.  @awandererfromys1680  I wonder whats the reason for the difference.
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  61.  @whuzzzup  Now that I think of it, that sounds a bit weird. Does that actually happen or is it just movies. Where I live (Helsinki, Finland) also has district heating but I don't recall ever seeing such "steam", not IRL nor in movies or TV series.
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  62. Maybe this guy has the required licence?
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  63. That pronunciation of "Jäger" isn't too far off.
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  64. 22:27 I think Rolls Royce isn't selling one yet.
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  65. 9:48 But does that work for double-sideband or single-sideband signals?
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  66. Did you buy 50 Shades of Gray to make that joke or had you bought it earlier to actually read it?
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  67.  @johngamble5270  It seems like the most viable fallback option if rewiring doesn't get approved.
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  68.  @mariusvanc  It's at least fairer than not paying or not being able to charge an EV at all. Of course, installing proper equipment is better.
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  69.  @thegreatoutagesign9204  "its not the gasses that conduct the electricity. Its the fire" The fire is just hot gas. "its a plasma" No, it's not.
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  70.  @thegreatoutagesign9204  Plasma by definition means: "a state of matter in which an ionized gaseous substance becomes highly electrically conductive to the point that long-range electric and magnetic fields dominate the behavior of the matter". A sufficient amount of ionization for that requires temperatures in excess of 10,000 K. The fire in your heating furnace is nowhere near hot enough for that.
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  71.  @thegreatoutagesign9204  10,000K was a figure I found googling for a lower limit for (thermal) plasma temperature. "Natural gas burns at 3,043K" Where are you getting that number? Wikipedia lists it as burning at 1950 °C (2220 K). https://en.wikipedia.org/wiki/Gas_burner
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  72.  @Owen_loves_Butters  It's not according a typical definition because the degree of ionization in a typical flame is rather low. Of course, that depends on where exactly you draw the boundary between plasma and gas which is somewhat arbitrary. However, fire isn't usually considered plasma.
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  73. Next: An actual personal AC. The way it should work is through an actual closed cycle. Then it can blow the cool air into your face and the hot air in the opposite direction. Might not be a paragon of efficiency but it should at least give you an illusion of working when you switch it on. Btw, if one already has a fan, I wonder if just hanging a wet towel in front of it would work as well as the devices in this video. (I saw this trick mentioned in a great anime called Battle Programmer Shirase.)
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  74.  @randomeverything3023 : "Inside, however would increase the rooms temp by adding the heat from the compressor." But I think that alone wouldn't stop a device like that being peddled. The rise in room temperature comes with a delay whereas the cool breeze to one's face would be immediate. People might not realize how inefficient that would be.
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  75. It hadn't occurred to me that someone might want to synchronize turn signals this much.
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  76. Detergent pack manufacturers should start to make 2-piece packs that can be broken into 2 so you can put the smaller one into the pre-wash compartment. That should be fancy enough to catch the consumers' attention.
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  77. Would it be possible to use water at the condenser end to increase efficiency?
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  78.  @nitehawk86  No. In German: kurz = short gesagt = said The narrator's name is Philipp Dettmer.
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  79. I think it's powered by gas, not gasoline. OK, "gas" can also be short for "gasoline" but I think in this case it's actually gas. (Or maybe you were being sarcastic and I failed to detect it?)
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  80. Does RCD/GFCI work differently with split-phase 240V and "normal" 240V (i.e. with hot and neutral wire)?
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  81. Could an actual etymologist confirm which theory is correct?
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  82. 0:04 "If you live in an area that gets pretty cold during the winter time, odds are you have a gas-fired furnace heating your home." Nope. My home is heated by district heating with the majority of that heat coming from CHP plants. It seems such an obvious solution in cold climates (at least in urban areas) that I'm surprised it's not being utilized in all areas fitting that description.
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  83.  @geekygirl2596 : "What is "district heat?"" It's a type of infrastructure where heat is produced centrally in some kind of plant and transferred to homes through pipes with near boiling water flowing in them. Here most of the district heat is produced in CHP plants, i.e. plants that generate both heat and electricity which is pretty efficient. Apparently, for some reason, district heating isn't very common in the USA? Though some comments here seemed to say that it's used at least in New York City.
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  84.  @AsterInDis  Mirrors can't function asymmetrically.
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  85.  @AsterInDis  "I know we can't get turn-on-turn-off windows" Boeing 787 Dreamliner has electronically dimmable windows. "window films exist that make it so that heat is reflected off what kinda looks like a mirror but allows a sufficient amount of light in" Windows that reflect infrared but not visible light were talked about in this video. They're obviously possible and that's not what I was reacting to. The part I quoted wanted windows that reflect IR only on one side which is impossible because reflection on one side but not the other would violate very basic laws of physics. In short, one-way mirrors cannot exist. The "one-way mirrors" used in e.g. recognizing a perpetrator of a crime are just half-reflective mirrors and the "one-way" aspect is simply one side being lit much more brightly than the other.
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  86.  @Owen_loves_Butters  It's definitely not possible. It would violate some very basic laws of physics. Bulletproof glass is a different thing because the process where either the bullet or the window breaks upon collision is not a reversible process.
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  87.  @Owen_loves_Butters  I'm quite confident that it is impossible. Physics is (mostly) time-symmetric and a one-way mirror would break that. I think there isn't a reasonable argument that that could be overcome. Technically some particle physics phenomena exhibit T-symmetry breaking but those are not relevant to light being reflected off windows. Negative temperatures are possible in systems where the energy level is bounded from above such as a spin system.
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  88. That doesn't make sense. Firstly, the cable has a wire going in both directions so there's no net inductance. Secondly, even if there were it would increase heating.
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  89. You should have said the power ratings in horsepowers instead of kW. :)
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  90. I guess the point was to get the effect without having to remember to set the temperature back to normal later.
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  91. Which is better, NSYNC or Rsync?
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  92. "Off blast" -Zlad
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  93.  mike hawk : But how quickly can it heat up your living room or bed room?
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  94.  @Thedamped : Which one of my comments are you referring to?
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  95.  @Thedamped : If you're referring to what I think it was just nitpicking. If I remember correctly, there was a comment (though I don't see it anymore) of having over 100% efficiency due to the benefit you described. What I just nitpicked about is that you can't really describe that added benefit as a percentage of the energy consumed which is why the over 100% is technically not really correct.
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  96. 23:25 "13 seconds or 13 seconds" Lol!
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  97. One advantage the US has in this regard is that American grid operators don't have to worry about TV pickup.
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  98.  @travelinghermit  I don't think most of the heat from radiators is conducted to the air, not radiated, because they're not hot enough for significant radiation. They're even shaped to maximize conduction.
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  99.  @hairyairey  "air is a poor conductor of heat that's why" But a radiator also has to conduct the heat to the air. (Also, in the ducts the heat in the air moves by convection, not conduction.)
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  100.  @Jemalacane0  Where does that extra energy go?
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  101. But what if you use a combination of a low-tone and a high-tone klaxon?
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  102. 8:04 "There is no such thing as a more efficient space heater." Theoretically, a heater that works by pumping heat into the room from outside could have an efficiency of over 100%. (Of course, any system like this would have to actually be installed and not just bought and plugged in, it's efficiency might not be described as a percentage of over 100%, and its efficiency wouldn't be a fixed value as it would depend on the temperature difference between air outside and inside the room.)
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  103. 9:58 "Ask me how I know." How do you know? 17:06 "Ask me how I know." How do you know?
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  104. Btw, is it a problem if you happen to be taking the maximum amount of power from one side of the split-phase and none from the other? Do they have to be "balanced"?
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  105. Coming back to the "The US electrical system is not 120 V" video, I wonder if would make sense for Europe to similarly start using split-phase instead of 3-phase at homes but with a higher voltage. As mentioned in the video the US uses 120V/240V split-phase power. Europe uses 230V/400V 3-phase power so the higher voltage one can get is only about 1.7 times higher than the voltage of a single phase instead of 2 times higher. With split-phase power, the voltage could be 200V/400V so that appliances requiring higher voltage could still get that 400V but the voltage of a single phase relative to neutral would be lower making it safer. Alternatively, if a higher voltage is seen as useful the voltage could be 230V/460V so that power-hungry appliances could get a higher voltage without increasing the voltage of a single phase. Or possibly the voltage could be chosen to be intermediate between these two.
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  106. What about the water heater? Could that be handled with a heat pump too?
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  107.  @complainer406  What I was thinking about when asking the question was system size energy consumption. Would the 20,000 BTU system he mentions be enough to heat both indoors air and water? If the system would need to be bigger would the electrical connection be able to handle it in his case?
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