https://www.explainxkcd.com/wiki/api.php?action=feedcontributions&user=172.71.222.76&feedformat=atomexplain xkcd - User contributions [en]2024-03-29T11:20:05ZUser contributionsMediaWiki 1.30.0https://www.explainxkcd.com/wiki/index.php?title=Talk:2818:_Circuit_Symbols&diff=330571Talk:2818: Circuit Symbols2023-12-11T06:07:45Z<p>172.71.222.76: </p>
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The direct link to the comic is getting a 404 error. But it appears at the xkcd.com home page. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 01:31, 22 August 2023 (UTC)<br />
:The link is working now. [[User:Nitpicking|Nitpicking]] ([[User talk:Nitpicking|talk]]) 02:33, 22 August 2023 (UTC)<br />
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Randall is symbolizing sheep with a coil because ... wool takes a helical shape. See https://commons.wikimedia.org/wiki/Wool#/media/File:Royal_Winter_Fair_Wool.jpg. [[User:Nitpicking|Nitpicking]] ([[User talk:Nitpicking|talk]]) 02:33, 22 August 2023 (UTC)<br />
:I think it's meant to be a little prince reference; it's a "box with three holes" [[Special:Contributions/172.71.222.76|172.71.222.76]] 06:07, 11 December 2023 (UTC)<br />
The title text is probably a reference to the classic novella "The Scarlet Letter" by Nathaniel Hawthorne (a common classroom reading in the US). In this novella, a young Puritan woman "sins" by having a child out of wedlock. She is punished by having to wear the letter A (for adultery). [[User:Comsmomf|Comsmomf]] ([[User talk:Comsmomf|talk]]) 02:54, 22 August 2023 (UTC)<br />
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Can someone with more wiki-foo than me please put the actual images for the symbols in a new first column? [[User:Blackbearnh|Blackbearnh]] ([[User talk:Blackbearnh|talk]]) 03:01, 22 August 2023 (UTC)<br />
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:The easy way to do this might be with the [https://www.mediawiki.org/wiki/Extension:SpriteSheet SpriteSheet extension], but maybe that's more trouble than it's worth. Any admin thoughts about installing it? [[User:JohnHawkinson|JohnHawkinson]] ([[User talk:JohnHawkinson|talk]]) 02:22, 25 August 2023 (UTC)<br />
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I tried, unsuccessfully, to learn if there were "Scarlet Letters" that represented other sins ['A' is mentioned to be for 'Adultery', Maybe 'O' for Onanism?] [[User:These Are Not The Comments You Are Looking For|These Are Not The Comments You Are Looking For]] ([[User talk:These Are Not The Comments You Are Looking For|talk]]) 03:41, 22 August 2023 (UTC)<br />
:From what I understand, ‘BJ’ had its fair share of supporters. [[Special:Contributions/172.70.210.247|172.70.210.247]] 04:47, 22 August 2023 (UTC)<br />
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What exactly does "the opposite of capacitors" mean in this context? I'm not that familiar with EE, but from my limited understanding of inductors this is an incorrect and confusing statement. [[Special:Contributions/172.70.126.79|172.70.126.79]] 08:07, 22 August 2023 (UTC)<br />
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:They are the conjugate complex (so the sentence is kind of half-true), if you consider complex impedances. Sebastian --[[Special:Contributions/172.68.110.169|172.68.110.169]] 08:56, 22 August 2023 (UTC)<br />
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:Behaviorally the description makes sense, capacitors behave the same way regarding voltage vs. current as inductors behave regarding current vs. voltage and vice versa. Capacitors can "instantaneously" allow a spike in the current flowing through the circuit path that they are placed in, while the voltage across a capacitor can't change instantaneously and requires time to change incrementally (with a corresponding decline over time in the current flowing). Inductors "instantaneously" allow the voltage across their terminals to spike, but the current flowing through it can't change instantaneously and requires time to change incrementally (with a corresponding decline in the voltage across the inductor). Capacitors can act as a sort of "shock absorber" (no pun intended) or low-pass frequency filter for voltages, as inductors can for current. So they are very much considered complementary and the "essentially the opposite of capacitors" comment does pretty much make sense to EEs. But yes, it's not a particularly illuminating description without that background, and the description isn't really valid regarding their physical makeup or what makes them tick, just their role in a circuit. [[Special:Contributions/172.71.146.213|172.71.146.213]] 09:32, 22 August 2023 (UTC)<br />
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:Incapacitors [[Special:Contributions/172.70.85.108|172.70.85.108]] 16:48, 25 August 2023 (UTC)<br />
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The "overpass" is troubling me, as a map fan. Dependant upon the conventions of any given map illustrator this could easily be more an ''underpass'' (main road being the || track, lesser track being the — that sneaks beneath it) or a 'green bridge' (road is the — and the bridge 'symbol' is the || with no actual route using the space between its edges) or a minor road intersection of an uncrossable dual carriageway (each || is a directional way, separated by central reservation, and a historic road/lane is given T-junction access to/from the adjacent direction of travel, but no local flyover to access the opposite continuation/direction, probably have to use other flyovers/turning points above and below this snapshot). Or it's just a regular major/minor crossroads (track-level horizontal/E-W, more main road vertically/N-S) and is entirely at-grade so not involving a bridge at all. But all very much will rely upon the publisher's/renderer's choice of map-symbolism. [[Special:Contributions/172.70.91.95|172.70.91.95]] 11:27, 22 August 2023 (UTC)<br />
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:What's your hope? That Randall will edit his comic? -- [[User:Dtgriscom|Dtgriscom]] ([[User talk:Dtgriscom|talk]]) 11:41, 22 August 2023 (UTC)<br />
::No more than I wish he'd use IEC resistors rather than the US zigzags. Just highlighting that (in isolation) there's so easily an alternate inference, dependent upon what notation/symbology you're most exposed to. [[Special:Contributions/172.70.162.199|172.70.162.199]] 16:36, 22 August 2023 (UTC) <br />
:I appreciated the map trivia, personally [[User:Dextrous Fred|Dextrous Fred]] ([[User talk:Dextrous Fred|talk]]) 15:18, 22 August 2023 (UTC)<br />
::Cheers, though I can't help but think that I explained it badly. And without much reason to. [[Special:Contributions/172.70.162.199|172.70.162.199]] 16:36, 22 August 2023 (UTC)<br />
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:I added the joke about needing a citation-needed joke. Please remove if you don't feel it was needed after all.<br />
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:Where I live the distinction between underpass and overpass is more about whether the bridge is at grade, and excavation has been done for the other road to pass under (i.e. under the ground level) or the bridge is above grade and the road it crosses over is at grade. --[[Special:Contributions/162.158.63.159|162.158.63.159]] 11:28, 25 August 2023 (UTC)<br />
::From my perspective, you also need to consider flyovers (bridges rising above grade, usually more minor or singular carriageways compared to the at-grade main road with or without median-separated carriageways). If the main route rises over the minor (which remains at-grade, more or less) with clear over-ground construction, it's just a road-bridge. An underpass need not be subterrainean, and often can be an at-grade "original" route (typically pedestrian) beneath the embankmented new major road (or other route, e.g. rail) that was engineered across it, in the same subtle manner as a culvert. Or even what you'd now term the stretch of road "bridged" (or tunnelled) beneath the building of a cross-highway shopping centre, like some towns do in order to sustain an inner ringroad and a large footprint shopping centre.<br />
::In general, if the 'over' road doesn't really notice the 'under' (it's still mostly the same grass verging, maybe briefly slightly higher crash-barriers on top of whatever embankment-guarding barriers already exist but no clear 'bridge' details) then I'd just name the underpass as such, as everything on that is definitely going to know that it is diving under the upper route<br />
::It can be complicated. The {{w|File:No pedestrians (geograph 5985118).jpg|extended runway seen here}} is possibly at-grade overpass, w.r.t the whole airport "level" (equivalent to a by-pass embankment?), while the road looks sunken (as can be seen by how much the pedestrian side-portal need not be). It could be a runway on an overpass, though I'd say the road is an underpass (with a possible argument that it was always a cut'n'cover tunnel, or passing under ''really'' long bridge). [[Special:Contributions/172.70.90.138|172.70.90.138]] 17:46, 25 August 2023 (UTC)<br />
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With a capacitor you can build a low-pass filter. It can be used in signal processing like audio devices to filter out noise. [[Special:Contributions/172.70.243.218|172.70.243.218]] 21:01, 22 August 2023 (UTC)<br />
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I think the Battery/Baettry/Batttttttttery joke is probably a reference to the oreo/oreoreo/etc meme that can be seen at https://i.kym-cdn.com/photos/images/original/001/839/727/d7f.jpg . [[Special:Contributions/172.70.38.170|172.70.38.170]] 13:58, 23 August 2023 (UTC)Bumpf<br />
:Feel free to add that to the page! --[[User:FaviFake|FaviFake]] ([[User talk:FaviFake|talk]]) 20:44, 23 August 2023 (UTC)<br />
:To me the last one sounds like hoe Metallica sings battery in the song ‘Battery’ <br />
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The electricity in a wave pool citation needed is the first properly funny one I've seen in quite a while - I approve. [[Special:Contributions/172.70.85.135|172.70.85.135]] 16:49, 25 August 2023 (UTC)<br />
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The capacitor explanation is a bit of a mess at the moment, with pronouns lacking any apparent referent. I'm going to clean it up to the best of my ability, but since I only know things from the civil engineering side and not the electrical engineering side, it will almost certainly need someone who actually understands capacitors to give it a once or twice over.[[Special:Contributions/162.158.174.197|162.158.174.197]] 15:55, 29 August 2023 (UTC)</div>172.71.222.76https://www.explainxkcd.com/wiki/index.php?title=Talk:2737:_Weather_Station&diff=306282Talk:2737: Weather Station2023-02-15T12:27:27Z<p>172.71.222.76: Drag comment</p>
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I'm not sure if the comment about the spinning speed in the explanation section is needed, still, added it for clarity. Feel free to remove it if it seems out of place. [[User:Xkcdjerry|Xkcdjerry]] ([[User talk:Xkcdjerry|talk]]) 07:13, 14 February 2023 (UTC)<br />
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:Totally needed. -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 22:14, 14 February 2023 (UTC)<br />
:: It's what Randall would have done [[User:Boatster|Boatster]] ([[User talk:Boatster|talk]]) 22:28, 14 February 2023 (UTC)<br />
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''Wheeeeeeeeeeeee!'' [[User:Mushrooms|Mushrooms]] ([[User talk:Mushrooms|talk]]) 10:57, 14 February 2023 (UTC)<br />
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It would be great if the explanation also offered a comparison between Cueball's arm speed and the wind speed of most tornadoes, as knowing the speed that Cueball's spinning it at in a bid to make it think there's a tornado doesn't mean much if one doesn't know how fast tornadoes also go. --[[Special:Contributions/172.71.242.191|172.71.242.191]] 13:46, 14 February 2023 (UTC)<br />
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FYI the rain gauge in Borrowdale, Cumbria, England - reputedly the wettest place in England - is set into a wall at thigh-height, with a collecting spout. A local farmer told me that as a boy, the gauge was between the school bus drop-off and the farm, so he and his brothers used to regularly top it up by taking a p1ss....distorting weather records has a long history!<br />
15:34, 14 February 2023 (UTC)[[Special:Contributions/172.71.178.187|172.71.178.187]] 15:34, 14 February 2023 (UTC)<br />
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:And wait until chinese weather balloons come into play ;-) --[[Special:Contributions/162.158.129.139|162.158.129.139]] 17:59, 14 February 2023 (UTC)<br />
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::They don't. That's the point of shooting them down. -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 22:14, 14 February 2023 (UTC)<br />
::I haven't been watching Chinese weather reports, but have they been reporting that the weather over North America is explosive? [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 22:17, 14 February 2023 (UTC)<br />
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;Another note to user "No idea if there's a character limit..."<br />
[https://www.explainxkcd.com/wiki/index.php?title=2693:_Wirecutter_Recommendation&diff=306271&oldid=306270 We don't put that there.] It is already below the comic. The Transcript is for things not otherwise in (non-graphical) text form, i.e. to describe only what is drawn/scrawled in the image itself. Discussions about this can be found in the Community Portal and maybe elsewhere, and you'll see that very few (if any, and ought to be none) articles have this repeated in the Transcript, reflecting the current community consensus/practice/habit. HTH, HAND. (See prior comic's Discussion, as well. I wrote something about this, and other things, also in that spot. Won't repeat it, as it got longer than intended and confused other people.) [[Special:Contributions/141.101.98.189|141.101.98.189]] 01:02, 15 February 2023 (UTC)<br />
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No WAY "ten turns per second" is in a reasonable limit for a person. That's insanely fast! --[[User:Mushrooms|Mushrooms]] ([[User talk:Mushrooms|talk]]) 07:56, 15 February 2023 (UTC)<br />
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: Sorry, my bad :( should have made it clear that it meant something along hitting it with a hand to get it turning and not the hand rotating with it (which I agree would be ridiculous), any idea how to clarify that without making the paragraph too long? [[User:Xkcdjerry|Xkcdjerry]] ([[User talk:Xkcdjerry|talk]]) 08:33, 15 February 2023 (UTC)<br />
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: Afterthought: I tested the 10 r/s with a ruler, a aero-whatsit would probably have less friction from the bearings but much more air resistance so it might not be easy to get it up to speed. However I do not have the means to test *that* scenario. And I'll be ever so grateful if someone with the means would check if it can be done. If it can't the last sentence would be better off as something like "This speed is not acheveable by hand but can be reached by whatever" [[User:Xkcdjerry|Xkcdjerry]] ([[User talk:Xkcdjerry|talk]]) 08:51, 15 February 2023 (UTC)<br />
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: For the record, the top speed reached by a ping-pong ball (which should be a bit above the top speed of a human arm dut to the bit of length added by the racket) is 112.6km/h. So a bit less than what's needed for the minimum speed quoted. [[Special:Contributions/172.71.122.227|172.71.122.227]] 11:46, 15 February 2023 (UTC)<br />
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; Turning manually runs quickly into drag — cube of speed — so it is unlikely that high rotational speeds can be achieved.<br />
[[Special:Contributions/172.71.222.76|172.71.222.76]] 12:27, 15 February 2023 (UTC)</div>172.71.222.76https://www.explainxkcd.com/wiki/index.php?title=Talk:2735:_Coordinate_Plane_Closure&diff=306006Talk:2735: Coordinate Plane Closure2023-02-09T11:58:50Z<p>172.71.222.76: </p>
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Is there significance to the fact that the axes aren't labeled in the warning? Can I plot y = 0.75x today or not?[[User:Brossa|Brossa]] ([[User talk:Brossa|talk]]) 15:05, 8 February 2023 (UTC)<br />
: you cannot because it intersects the given square as shown in this desmos thing i whipped up in 2 seconds: https://www.desmos.com/calculator/zb9nbrl6s5 [[Special:Contributions/172.70.43.29|172.70.43.29]] 15:38, 8 February 2023 (UTC)Bumpf<br />
::I can if the forbidden coordinates are 1 ≤ x ≤1.5 and 1.5 ≤ y ≤2[[Special:Contributions/172.70.131.66|172.70.131.66]] 15:56, 8 February 2023 (UTC)<br />
::: In the absence of other information, assuming horizontal ''x'' and vertical ''y'' would be conventional. --[[Special:Contributions/141.101.98.145|141.101.98.145]] 19:15, 8 February 2023 (UTC)<br />
"Hole" is also sometimes used to mean a particular coordinate on a function which is discontinous at some point but could have a value (for example sinx/x with a hole at (0,1)). [[Special:Contributions/172.70.206.92|172.70.206.92]] 19:18, 8 February 2023 (UTC)<br />
Randall listed 2 points, yet the cordoned off area is a square. 2 points define a line, not a square, he really should have thought of that. How is someone to know the invalid points without the diagram? Even with the diagram, we don't know whether points on the boundary are included! Is the line y=1 a valid line to draw? THESE ARE QUESTIONS THAT NEED TO BE ANSWERED RANDALL BE MATHEMATICALLY RIGOROUS NEXT TIME.<br />
: One reason could simply be the alignment between the coordinates and time. Reading out the numbers without paying attention to the mathematical punctuation you can form the sentence "the coordinate plane will be closed Thursday between 1:51 and 2:15 to repair a hole", following the typical structure of such a notice to not just provide a day but a time.<br />
Ironically, the notice makes it sound like using y=1 is fine, and the affected region is only strictly greater than y=1. That would make the region that's closed an open set, and the region that's open a closed set. [[Special:Contributions/172.70.110.230|172.70.110.230]] 22:46, 8 February 2023 (UTC)<br />
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🚧 DETOUR 🠕 KEEP WITHIN [[2646: Minkowski Space|MINKOWSKI CONES]] ⛔ DO NOT ENTER Y < |X| 🚧 [[Special:Contributions/162.158.90.38|162.158.90.38]] 23:37, 8 February 2023 (UTC)<br />
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So the joke is that the coordinate plane is closed when there's damage that causes it not to be closed? [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 23:44, 8 February 2023 (UTC)<br />
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Aw man, I was really looking... ''forward''... to doing math today. [[Special:Contributions/172.71.222.76|172.71.222.76]] 11:58, 9 February 2023 (UTC)</div>172.71.222.76https://www.explainxkcd.com/wiki/index.php?title=732:_HDTV&diff=305162732: HDTV2023-01-23T22:56:32Z<p>172.71.222.76: /* Explanation */ Updated tense for movies.</p>
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<div>{{comic<br />
| number = 732<br />
| date = April 26, 2010<br />
| title = HDTV<br />
| image = hdtv.png<br />
| titletext = We're also stuck with blurry, juddery, slow-panning 24fps movies forever because (thanks to 60fps home video) people associate high framerates with camcorders and cheap sitcoms, and thus think good framerates look fake.<br />
}}<br />
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==Explanation==<br />
This comic pokes fun at the differing standard between image quality for television sets and other electronic devices, even though both are based on essentially the same standards. When rating television sets, a {{w|1080p}} screen, that is, a screen 1,920 pixels wide and 1,080 pixels tall with progressive scan, is considered impressive. In contrast, the same resolution with a computer device is considered standard fare, given that, at the time of writing, a 4:3 ratio computer screen 1,024 pixels wide would have been expected. Widescreen monitors have already surpassed 1,920 pixels wide, and double widescreen monitors have become more common. As of the end of the 2010s, even most smartphones had a horizontal resolution nearing or at 1,080 pixels.<br />
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The title texts explains another disagreement involving images and popular opinion. The feeling that a viewer gets from watching a film in a theatre is different from the feeling from a home film, or again, between a serialized programme from an international television channel and a locally-broadcast programme. The disparity is that the small-time productions actually implement better-quality equipment than the big-time productions, in terms of higher frame rate (although not in image fidelity or other respects). However the small productions really are cheaper in other respects, and this feeling is transferred to the look of high frame rates, thanks to videotapes often being used instead of film stock. Low frame rates on more big budget films (and all old, nostalgic productions before high frame rates were commercially possible) mean low frame rates are associated with quality, despite not being as able to capture as much motion as better-quality high frame rates. Blur, judder, and slow pans are mostly absent in high-frame rate productions. This is changing, however, since the major films {{w|The Hobbit}} and {{w|Avatar 2}} were shot with higher framerates.<br />
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==Transcript==<br />
:[Cueball is pointing to a huge flatscreen HDTV on the wall. His friend is holding a cell phone.]<br />
:Cueball (HDTV Owner): Check out my new HDTV-a beautiful, high-def 1080p.<br />
:Friend: Wow, that's over ''TWICE'' the horizontal resolution of my cell phone.<br />
:Friend: In fact, it almost beats the LCD monitor I got in 2004.<br />
:It baffles me that people find HDTV impressive.<br />
{{comic discussion}}<br />
[[Category:Comics featuring Cueball]]<br />
[[Category:Multiple Cueballs]]</div>172.71.222.76