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*To*: tesla-at-pupman-dot-com*Subject*: Re: Big Capacitor?*From*: "Mark Broker" <broker-at-uwplatt.edu> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)*Date*: Mon, 09 Oct 2000 07:56:37 -0600*Delivered-To*: fixup-tesla-at-pupman-dot-com-at-fixme

Maxwell (I think) makes a 2.5kF cap rated around 87V for backup purposes. I distinctly remember from my physics 2 course (one of the only things I remember from that class, actually), is that a standard parallel plate cap 1F in value will have an approximate physical size of 10,000 sq meters spaced .001 m apart. The properties of electolytics make a large value possible in a small container, so a 1F cap at 50V is actually much smaller. Mark Tesla list wrote: > Original poster: "Phillip Heslin" <pheslin-at-home-dot-com> > > Hi folks, > > I think the key here is something that hasn't been mentioned yet. The > size of the cap is a function of the total energy storage of the the cap > as measured in Joules and the energy density of the particular type of > cap. The total energy stored in a cap is calculated with the equation > E=(F/2)*(V^2) where E is the total energy in Joules, F is the > capacitance in farads and V is the voltage. ( I hope I remembered that > correctly) Energy densities vary with the type of construction I.E. > electrolytics have a different energy density than a foil cap. I believe > that the highest energy density record is held by the relatively new > Maxwell powercache capacitors. I have seen a rectangular cap about the > size of a 12 oz coke can with a rating of 2500 farads, yes farads! and > rated at 2.5V > > B.T.W if I mis-remembered that formula, someone please correct me. > > Safe Coiling! > > Phil Heslin > > --snip-- > > I have a question or two for any one out there. How big would a capacitor > > have to be, (physical dimensions), to have a value of 1 Farad? I know that > > voltage rating would be a determining factor, but just a ballpark figure. > > Has anybody ever seen one? > > Just curious.

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