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*To*: tesla-at-pupman-dot-com*Subject*: Re: Big Capacitor?*From*: "Phillip Heslin" <pheslin-at-home-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)*Date*: Sun, 08 Oct 2000 22:31:56 -0600*Delivered-To*: fixup-tesla-at-pupman-dot-com-at-fixme

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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