Talk:3106: Farads - Revision history

82.132.185.192 at 15:17, 8 May 2026

2026-05-08T15:17:38Z

2A02:B027:8F06:5D6E:76F:A213:3F7B:AACE: Relationship between size, capacitance and voltage rating of capacitors

2026-05-08T14:20:52Z

Relationship between size, capacitance and voltage rating of capacitors

69.14.74.137: A Joke about Measurement

2025-07-13T03:38:09Z

A Joke about Measurement

170.85.70.249 at 18:12, 10 July 2025

2025-07-10T18:12:45Z

80.71.143.166: Added comment of easter egg.

2025-07-10T09:38:26Z

Added comment of easter egg.

92.23.2.228 at 19:27, 3 July 2025

2025-07-03T19:27:48Z

Hkmaly at 18:32, 3 July 2025

2025-07-03T18:32:15Z

Bicorn at 21:03, 28 June 2025

2025-06-28T21:03:23Z

82.132.246.158 at 22:23, 27 June 2025

2025-06-27T22:23:13Z

81.109.188.229: Mentioned goofing off ex-colleague.

2025-06-27T19:47:16Z

Mentioned goofing off ex-colleague.

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 For different capacitors of a given physical size, what is the approximate relationship between capacitance and max voltage, all other factors also being equal?  Simple inverse?  Is it even a reasonable question to ask?  Clearly, a gigantic capacitance and low voltage isn't dangerous; a tiny capacitance and extremely high voltage also isn't, if for no other reason than that it would discharge through the air. [[User:BunsenH|BunsenH]] ([[User talk:BunsenH|talk]]) 00:39, 26 June 2025 (UTC)
-    Inverse square. If you want double the voltage your insulation needs to be double as thick, which halves the capacitance. However with double the insulation you can fit only half the area, which halves the capacitance again
+:Inverse square. If you want double the voltage your insulation needs to be double as thick, which halves the capacitance. However with double the insulation you can fit only half the area, which halves the capacitance again 14:20, 8 May 2026 (UTC)[[Special:Contributions/2A02:B027:8F06:5D6E:76F:A213:3F7B:AACE|2A02:B027:8F06:5D6E:76F:A213:3F7B:AACE]] 14:20, 8 May 2026 (UTC)
-:20, 8 May 2026 (UTC)[[Special:Contributions/2A02:B027:8F06:5D6E:76F:A213:3F7B:AACE|2A02:B027:8F06:5D6E:76F:A213:3F7B:AACE]] 14:20, 8 May 2026 (UTC)
+::''Slightly'' more complex, as the insulator/non-insulator division of thickness would need to be considered, which ''could'' be doubled-and-halved, but needn't be. Starting with 1/3 of available space as insulator, doubled, would become 2/3 with the remaining counterpart volume going from original 2/3 to now 1/3 (halved, yes)... But a 1/4=>2/4 doubling would be 3/4=>2/4 (two-thirdsing) on the other side of the split. 1/2 as insulator, initially, sends the counterpart from (also) half down fully to zero, and anything already greater than half for the former sends you into negative utility (if that were physicaly possible) now available to fulfil the latter aspect.
 Although he threw in one pound, I think the point is that some base metric units are impracticaly large or small. The MKS system has a kilogram as a "base" unit rather the gram. The CGS system used grams but centimeters instead of meters. Nobody uses ares or bels. [[Special:Contributions/2600:8800:4880:66B:809:D867:2F4C:D77A|2600:8800:4880:66B:809:D867:2F4C:D77A]] 03:41, 26 June 2025 (UTC)

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 For different capacitors of a given physical size, what is the approximate relationship between capacitance and max voltage, all other factors also being equal?  Simple inverse?  Is it even a reasonable question to ask?  Clearly, a gigantic capacitance and low voltage isn't dangerous; a tiny capacitance and extremely high voltage also isn't, if for no other reason than that it would discharge through the air. [[User:BunsenH|BunsenH]] ([[User talk:BunsenH|talk]]) 00:39, 26 June 2025 (UTC)
+    Inverse square. If you want double the voltage your insulation needs to be double as thick, which halves the capacitance. However with double the insulation you can fit only half the area, which halves the capacitance again
 Although he threw in one pound, I think the point is that some base metric units are impracticaly large or small. The MKS system has a kilogram as a "base" unit rather the gram. The CGS system used grams but centimeters instead of meters. Nobody uses ares or bels. [[Special:Contributions/2600:8800:4880:66B:809:D867:2F4C:D77A|2600:8800:4880:66B:809:D867:2F4C:D77A]] 03:41, 26 June 2025 (UTC)

← Older revision		Revision as of 03:38, 13 July 2025
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	All that panic about Farad ... I wonder what would they say if he was holding something creating a magnetic field of one Tesla. -- [[User:Hkmaly\|Hkmaly]] ([[User talk:Hkmaly\|talk]]) 18:32, 3 July 2025 (UTC)		All that panic about Farad ... I wonder what would they say if he was holding something creating a magnetic field of one Tesla. -- [[User:Hkmaly\|Hkmaly]] ([[User talk:Hkmaly\|talk]]) 18:32, 3 July 2025 (UTC)
	:I tried to something similar with an item one Kelvin, thinking that people would be interested, but just ended up being given the cold shoulder. [[Special:Contributions/92.23.2.228\|92.23.2.228]] 19:27, 3 July 2025 (UTC)		:I tried to something similar with an item one Kelvin, thinking that people would be interested, but just ended up being given the cold shoulder. [[Special:Contributions/92.23.2.228\|92.23.2.228]] 19:27, 3 July 2025 (UTC)
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		+	See also: [https://www.youtube.com/watch?v=KmfdeWd0RMk A joke about measurement]. He constructs a consistent system of measurement based around the speed of light, the calorie, and Middle C. Once you have that you can start deriving other units, such as power. It's measured in "middle-C calories" and works out to 1094.64 Watts, the "first derived unit that's actually a convenient size." [[Special:Contributions/69.14.74.137\|69.14.74.137]] 03:38, 13 July 2025 (UTC)

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 Please note that the pound, shown in panel 2, is not an SI unit. The corresponding SI unit is the kilogram; an item with a mass of one kilogram is still commonplace. [[User:Troy0|Troy0]] ([[User talk:Troy0|talk]]) 03:11, 25 June 2025 (UTC)
 :I added Trivia to mention that (and another thing), sorry that I didn't read here first but I think I've covered your thoughts on the subject. [[Special:Contributions/82.132.246.160|82.132.246.160]] 13:07, 25 June 2025 (UTC)
 When my father was a young engineer, the old guys would haze the new kids by asking them to fetch a "one farad capacitor". But everybody in the lab said "Sorry, I ran out, go ask Fred on the top floor", "Go ask Tom in the basement", "Try Peter's Parts on Vine St", etc--- give the kid a run-around. The joke was: at the time, 1F was likely large than a large garbage can and many hundred (non-SI) pounds. But the world changed, and in recent years you can easily buy 1F @ 16V, about the size of a soup can, to smooth car sound power feeds.  --[[User:PRR|PRR]] ([[User talk:PRR|talk]]) 03:27, 25 June 2025 (UTC)

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 :If the stick really is parallel, Cueball's height is 1.78&nbsp;m, or 5'10" for the Americans, or 9.02&times;10<sup>6</sup>&nbsp;<i>ħc</i>/eV for the Proxima b-ans. [[User:MinersHavenM43|MinersHavenM43]] ([[User talk:MinersHavenM43|talk]]) 15:19, 25 June 2025 (UTC)
 ::in my neck of the woods we usually use centimetres for people's heights. It's more convenient to not need to use a decimal separator. [[User:Bicorn|Bicorn]] ([[User talk:Bicorn|talk]])
 In agreement with the first discussion point, this description remains low quality.  It claims that after the unwarranted panic, Megan and White Hat "ask why he [Cueball] is carrying it [the 1-farad capacitor] around."  This does not occur at any point in the comic or the Title Text, and should be removed. [[Special:Contributions/198.147.146.254|198.147.146.254]] 10:21, 25 June 2025 (UTC)

← Older revision		Revision as of 19:27, 3 July 2025
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	All that panic about Farad ... I wonder what would they say if he was holding something creating a magnetic field of one Tesla. -- [[User:Hkmaly\|Hkmaly]] ([[User talk:Hkmaly\|talk]]) 18:32, 3 July 2025 (UTC)		All that panic about Farad ... I wonder what would they say if he was holding something creating a magnetic field of one Tesla. -- [[User:Hkmaly\|Hkmaly]] ([[User talk:Hkmaly\|talk]]) 18:32, 3 July 2025 (UTC)
		+	:I tried to something similar with an item one Kelvin, thinking that people would be interested, but just ended up being given the cold shoulder. [[Special:Contributions/92.23.2.228\|92.23.2.228]] 19:27, 3 July 2025 (UTC)

← Older revision		Revision as of 18:32, 3 July 2025
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	I'd just like to point out that the confidence with which the explanation declares the capacitor to be low energy and therefore safe is exactly the sort of confidence that gets you electrocuted.[[Special:Contributions/2602:FF4D:128:D56:8114:9FE5:5A4D:499F\|2602:FF4D:128:D56:8114:9FE5:5A4D:499F]] 16:19, 26 June 2025 (UTC)		I'd just like to point out that the confidence with which the explanation declares the capacitor to be low energy and therefore safe is exactly the sort of confidence that gets you electrocuted.[[Special:Contributions/2602:FF4D:128:D56:8114:9FE5:5A4D:499F\|2602:FF4D:128:D56:8114:9FE5:5A4D:499F]] 16:19, 26 June 2025 (UTC)
	:Yes, and "low-energy" needs definition. It's easy to find caps in the ballpark of 1F, >30V rating, hundreds of milliohms ESR, under $50, and small enough to easily hold in your hand. This could have an energy around 1000 J and could supply tens of amps for a significant fraction of a second. It's not as dangerous as, say, a grenade, but enough that I would be careful to avoid accidental self-discharge, especially across the body. And this assumes that the previous user didn't charge it above the rated voltage! [[Special:Contributions/174.126.217.139\|174.126.217.139]] 17:46, 26 June 2025 (UTC)		:Yes, and "low-energy" needs definition. It's easy to find caps in the ballpark of 1F, >30V rating, hundreds of milliohms ESR, under $50, and small enough to easily hold in your hand. This could have an energy around 1000 J and could supply tens of amps for a significant fraction of a second. It's not as dangerous as, say, a grenade, but enough that I would be careful to avoid accidental self-discharge, especially across the body. And this assumes that the previous user didn't charge it above the rated voltage! [[Special:Contributions/174.126.217.139\|174.126.217.139]] 17:46, 26 June 2025 (UTC)
		+
		+	All that panic about Farad ... I wonder what would they say if he was holding something creating a magnetic field of one Tesla. -- [[User:Hkmaly\|Hkmaly]] ([[User talk:Hkmaly\|talk]]) 18:32, 3 July 2025 (UTC)

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 When my father was a young engineer, the old guys would haze the new kids by asking them to fetch a "one farad capacitor". But everybody in the lab said "Sorry, I ran out, go ask Fred on the top floor", "Go ask Tom in the basement", "Try Peter's Parts on Vine St", etc--- give the kid a run-around. The joke was: at the time, 1F was likely large than a large garbage can and many hundred (non-SI) pounds. But the world changed, and in recent years you can easily buy 1F @ 16V, about the size of a soup can, to smooth car sound power feeds.  --[[User:PRR|PRR]] ([[User talk:PRR|talk]]) 03:27, 25 June 2025 (UTC)
-[I used to work with a guy who'd fall for all of the gags, going off to fetch striped paint, a glass hammer (there are such things in fact), a spirit level bubble, etc. Turns out he'd just goof off, completely aware he was on a wild goose chase.]
+:[I used to work with a guy who'd fall for all of the gags, going off to fetch striped paint, a glass hammer (there are such things in fact), a spirit level bubble, etc. Turns out he'd just goof off, completely aware he was on a wild goose chase.] {{unsigned ip|81.109.188.229|19:47, 27 June 2025}}
 This explanation would benefit from some elaboration on how and why supercapacitors are dangerous. [[Special:Contributions/195.252.226.234|195.252.226.234]] 04:41, 25 June 2025 (UTC)

← Older revision		Revision as of 19:47, 27 June 2025
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	When my father was a young engineer, the old guys would haze the new kids by asking them to fetch a "one farad capacitor". But everybody in the lab said "Sorry, I ran out, go ask Fred on the top floor", "Go ask Tom in the basement", "Try Peter's Parts on Vine St", etc--- give the kid a run-around. The joke was: at the time, 1F was likely large than a large garbage can and many hundred (non-SI) pounds. But the world changed, and in recent years you can easily buy 1F @ 16V, about the size of a soup can, to smooth car sound power feeds. --[[User:PRR\|PRR]] ([[User talk:PRR\|talk]]) 03:27, 25 June 2025 (UTC)		When my father was a young engineer, the old guys would haze the new kids by asking them to fetch a "one farad capacitor". But everybody in the lab said "Sorry, I ran out, go ask Fred on the top floor", "Go ask Tom in the basement", "Try Peter's Parts on Vine St", etc--- give the kid a run-around. The joke was: at the time, 1F was likely large than a large garbage can and many hundred (non-SI) pounds. But the world changed, and in recent years you can easily buy 1F @ 16V, about the size of a soup can, to smooth car sound power feeds. --[[User:PRR\|PRR]] ([[User talk:PRR\|talk]]) 03:27, 25 June 2025 (UTC)
		+
		+	[I used to work with a guy who'd fall for all of the gags, going off to fetch striped paint, a glass hammer (there are such things in fact), a spirit level bubble, etc. Turns out he'd just goof off, completely aware he was on a wild goose chase.]

	This explanation would benefit from some elaboration on how and why supercapacitors are dangerous. [[Special:Contributions/195.252.226.234\|195.252.226.234]] 04:41, 25 June 2025 (UTC)		This explanation would benefit from some elaboration on how and why supercapacitors are dangerous. [[Special:Contributions/195.252.226.234\|195.252.226.234]] 04:41, 25 June 2025 (UTC)