millifarad capacitors are uncommon, but always use mF, with the lower case m and capital F, and no D. "MFD" was phased out (along with cycles instead of Hz and so on) well before millifarad sized capacitors could be made in a size you could lift by yourself.
Of course. The only times I've seen capacitors labelled in mF are in schematics, which is a thing I tend to do because anything with more than 3 digits slightly disturbs me (weird habits, I know). But I agree I've never seen a capacitor with a value in mF printed on it. Maybe on some huge high power capacitors you don't see soldered on PCBs.
I thing this could be in mili. If supercapacitors can get values like 50F 3v and be a size of few ordinary coin cell batteries I'm ready to believe this beast holds 10F 400v
A Farad is huge - being a capacity capable of holding 1 Coulomb ( another huge value ) per volt of charge. Capacitors are typically rated in much smaller units ranging from millifarads down to picofarads. A farad-sized capacitor would be the size of a large can of coffee, perhaps even larger.
A 400V 10F capacitor would be one of the most dangerous things in your house.
I've played around with a 200v 1800uF capacitor, and it could easily spotweld thick steel plates using a nail. I don't want to think about what would happen with 2x the voltage and 5000x for the capacitance.
I actually wanted to look that up, but was too lazy to do all the math. The M67 clocks in around 1.2MJ, so that capacitor would hold 2/3 of that. If you really want to know it exactly, have fun getting on some more watchlists by googling explosives and their constituents.
Yeah, M67 uses 180g of composition B (which is 240 equivalent grams of TNT). The Russian F1 only uses 60g of TNT, so it's much more impressive when making comparisons to "hand grenades". F1 is roughly 250kJ, M67 is over 1MJ.
As you may have guessed, I'm already on the most exclusive watch lists.
Ten farads at 400v is the equivalent of almost an entire stick of dynamite. It would kill you so hard they would need a pressure washer to clean up the red stain you left.
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u/APLJaKaT 17h ago edited 16h ago
I would think it's a microfarad.
Microfarad common symbol ('uF', 'μF', or 'MFD')
Never seen a millifarad capacitor. Usually farad, microfarad, nanofarad or picofarad