1 farad = 1,000,000.uf

[serosmaness]

and if so how do they make the auto audio 1 farad cap so small?

 

[MikeB]

Small ? I don't think so... And they have only ~16volts

 

[azira]

Roughly put:

cap-size ~ capacitance x voltage handling

the size of the cap is porportional to it's capacitance and voltage handling.

So, if you only need a small amount of voltage handling, you can make the capacitance fairly high in a pretty small size. Such as those 1F 5v caps that are the size of a few poker chips stacked.

Those 1F car caps are not that small...
--
Danny

 

[djQUAN]

the caps are usually rated at 20-25V DC,

I don't think they are small considering the size and voltage rating.

for size comparisons, I usually multiply the voltage and capacitance ratings. (pointless but it makes some sense. )

so if the cap is 20v X 1000000uF, it would be approximately the same size as 100V 200000uF.

 

[serosmaness]

I have 4 15,000uf caps and combined they are larger in physical size then a 1 farad cap. So it is the voltage rating that makes the difference.

 

[deflorator]

Roughly put:

cap-size ~ capacitance x voltage handling

Danny

capasitor size ~ capacitance x (voltage) ^2

) RTFM

 

[acenovelty]

RTFM

Ripe Tomatoe From Molokai
Right Turn For Missouri
Roam The Frontier Miss
Rough Tough Female Masseuse
Right Tuthe Front Mister
Real Tough Farm Maiden
Read That First Mommie
Real Transistors From Motorola


nah, can't get it.





Prosit

 

[Variac]

Read The !@#$ Manual?

 

[kilowattski]

By jove, I think you've got it.

 

[Enzo]

Not Run to French Morocco?

 

[Bill Fitzpatrick]

Read The !@#$ Manual?

I object to your blatant attempts to sneak a cuss word by the obsenity software. Didn't a moderator recently complain about this when someone else did it?

I think every member should now recieve 1 free pass.

 

[lumanauw]

A very cheap (I mean very cheap) 1F or 2F car stiffening cap has a small elko inside it, then it is put to a big elko casing, filled with concrete or resin.

 

[destroyer X]

Hello dear Fitz, como está sentando, how are you sitting

The people sent me a fax message, they told me you had some problems to be contantly over this motorcicle....are you OK!....now sitting confortably...hehehehehe

regards,

Carlos

 

[Bill Fitzpatrick]

Melhore-o sobre do que sob ele!

Thanks for your concern.

 

[destroyer X]

Hehe, that's rigth, better to be over.

And worst to be under...happy to see you healthy and with the same old good mood.

regards to you bill

Your friend,

Carlos

 

[gmphadte]

search for ultracapacitor on the net

some reading...

http://email.designnews.com/cgi-bin2/DM/y/eihO0HhEUm0DaZ0CIkV0AM
http://www.globalspec.com/newsletter/ViewIssue?Vol=Vol4Issue21&id=-346737522

 

[K-amps]

I have 4 15,000uf caps and combined they are larger in physical size then a 1 farad cap. So it is the voltage rating that makes the difference.

Hate to be repetitive but manufacturing techniques have a lot to do with Size as well, e.g. an ELNA/Nichicon etc electrolytic is usually half the volume of a Mallory or CD...

 

[alvaius]

The small 1F - 2.5V caps, etc. used for battery backup are usually designed for very low leakage, and also very low current (high internal resistance). Caps designed for very high pulse currents, are generally larger as well. The problem with those ones in the cars, is that the specs are usually not truly available, at least not the specs that an electrical engineer would need to use them.