Guys you're not gonna believe this:
xkcd
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pfff at 2.7V that aint much of a danger, now show me 50F @ 2kV
Yes, I do not believe it. It must be a misprint, right?
No it's real! I can't verify the exact rating since it OL's my meter, but with some circuitry it can power my Pi for a few minutes. I got them from element14, so it's unlikely to be a fake product.
Amazing! Thanks for the reply.
🚲
this guy gets it.
Thats literally exactly what it is. They aren't derived from the metric system like all units in the system, theyre a specialized edge case where a conversion was specifically written in because america sucks. There are no other conversions in the metric system, units are derived from constants based on a set of specific rules that the pound and yard do not adhere to.
So, you don't understand the joke, but you detected an excuse to say America Bad. Your employer must be pleased.
The joke of this comic is based around most units in both the metric and imperial system being fairly mundane quantities. A one meter long stick is about half the height of a man, a one pound rock is about the size of his fist, a one volt battery has the potential of a dead AA.
The Ferad is the SI unit of capacitance, equal to 1 coulomb per volt. A one ferad capacitor can hold enough energy to do a number of exotically dangerous things.
Lmao what makes you think i didnt understand the joke? We're talking about units of measurement. And yeah i dont need an excuse to say America Bad. It is bro, have you been paying attention?
Edit* my comment was meant to be a reply to another comment about the metric system, not top level. Not sure how that happened aince i clicked reply right from my inbox. Stick by what i said about america
And I have to say, the chemistry math that resulted from the metric system is elegant. I've forgotten most of it by now, but at some point, I was able to envision the machinery behind it all, and it was beautiful.
Haha that's a good one
Capacitors are usually in the realm of pico to micro farads
A one farad capacitor charged to a respectable voltage would feel like a doomsday device in your hand
Worked with an industrial robot one that had 700V 0.5F electrolytic capacitors on its power supply. Those things were massive.
I was in the building when when a 3F 1200V capacitor, part of a multi-rack mounted capacitor bank (powered a magnetohydrodynamic modeling experiment), failed. It ripped the rack's 30cm mounting bolts out of the floor, launched the three-tonne rack hard enough to crack the ceiling and shattered every window in the facility. I want to say that afterwards I never broke the rule about not being allowed to enter the experiment room until the banks were discharged, but I'd be lying. Undergrads are idiots, and holy cow don't fuck around with those caps...
Damn!
You see low voltage ones for things like memory backup on hi-fi gear. I have some 3F/5v capacitors in an old Technics tiner.
Wait so this is like one mistake away from turning that stickman into a fried stickman?
Depends on the voltage it's charged with, but household current would give it more energy than a shotgun has.
Realistically one would not do that unless you were dealing with something industrial. You would use them otherwise for things like dampening lower voltage systems that need a lot of current.
Closer to the danger level of someone holding two exposed wires plugged into the wall.
I used to teach AP physics to kids on the weekends. One asked me why Farads were so big. I had to explain that there’s a fixed ratio between Farads, Volts, and Joules. One of them had to be crazy big or crazy small.
See also Coulombs.
Caps are especially scary because they can develop their own charge through static electricity, so large value caps are often shipped with their terminals tied together.
There's nothing in the SI system that says ratios have to be between base units. Units that involve mass are defined against the kilogram not the gram.
The kilogram is just a thousand grams, so if they're tied together, they would still be tied together.
Right. 1F = 1C/1V .. they could have just as easily said 1kF = 1C/1V. Many things use kg instead of g. You can tie together things other than the unscaled base units. Then they are still tied together but 1F is a more reasonable amount.
Only criticism is the use of non-metric weight units when everything else is SI-based.
The joke wouldn't have worked as well.
A gram is actually a pretty small unit of weight, and the joke relies on the base units. It's actually a weird little abberation in the metric system that the "base" unit is considered the kilo gram. so a 1 gram rock would be a little pebble, strangely small.
Wikipedia currently says:
the international avoirdupois pound, [...] is legally* defined as exactly 0.45359237 kilograms
So, technically, a pound is a metric weight, only a niche one whose use may or may not be permitted by local regulations.
Similar is true* of the inch, which is defined as precisely 25.4 millimetres.
* The US, UK and a handful of others collectively signed this into their respective laws in 1959. You might think we don't use the pound in the UK any more but it still shows up often in informal situations. Ditto inches and feet.
That's similar to saying "Auf Wiedersehen" translated to English is "until I see you again", therefore "Auf Wiedersehen" is technically English. Just because there's a recognised translation to a thing, that doesn't make it that thing.
It's not a recognised translation- it's the definition.
If we're going to split hairs then while it's defined in terms of metric units, it doesn't scale with prefixes and factors of 10, so it can't be an S.I. unit.
You're right, the imperial units are not S.I. units, but each (most?) imperial unit is defined by an S.I. unit.
The other way around maybe, that is, an English word becoming technically foreign because we decide that we are going to write its definition in a different language in the dictionary.
It wouldn't make sense to do that though, which kind of breaks the analogy. Unless you count words borrowed wholesale because we didn't have that word, and those definitions were written in a foreign language first.
As it is "one pound" now translates exactly to "nought point four five three five nine two three seven kilograms" where it didn't before 1959. "kilogram" is one of those foreign borrowings.
I would argue that a legally defined conversion to a meter or another metric value does not make a unit metric in and of itself. Those units have to adhere to the system, which is clearly based on decimal values, not just some arbitrary conversion with an absurd precision that was only signed into law to minimize the inconvenience caused by non-standard units.
It's not a defined conversion, it's the literal, internationally ratified definition of what those units are. Or maybe "redefinition" ought to be the word there; prior to that definition there were several very similar, roughly equal but ultimately not internationally standardised units in use. And since they were redefined in terms of SI units, they're technically SI.
This is one of those "tomatoes are technically fruit, but no-one with good sense would put them in a fruit salad" situations.
However, 1 farad is really goddamn big.
Lol, explainXKCD
Ah, Randall is alive! I kept thinking my bot had broken as it's so rare for him to miss an upload.
Their names are Cueball, Megan, and White Hat?
It is my understanding that XKCD's "characters" are somewhere between an actual character and an archetype. It isn't clear...and kind of doesn't matter, if Black Hat is the same guy in every comic or if he's a different devious schemer in each. Randall hasn't bothered to name any of them so the community has given them unofficial nicknames.
Randall hasn’t bothered to name any of them so the community has given them unofficial nicknames.
Megan is actually named in multiple comics though, ~~so is Danish (Black Hat's girlfrenemy)~~ (actually that was picked semi-arbitrarily by the community). Cueballs also have different names occasionally but they're all drawn the same.
And actually I do believe that certain non-named characters are the same comic-to-comic. Black hat and Beret guy almost certainly are.
Yeah Black Hat called her "My dearest darling danish" after she called him "my cutie pie." Closest thing she's had to a name.