Date: Tue, 27 Feb 2001 15:11:09 -0800 (PST)

Author: William Beaty

Subject: Re: 1 farad capacitor


On Tue, 27 Feb 2001, Urs Lauterburg wrote:

> Hello to you all,
> And then again I just bought a 2400F capacitor. It is not a very small one
> and not very cheap either plus it is only rated at 2.3V, but it can output
> a peak current of 500A in the beginning of a discharge. A small light bulb
> will burn for days depending on how many mAmps it will drain. It takes long
> to charge the thing too and the power supply gets hot by bringing up all
> the current for such a long time.

Where from? The charcoal supercapacitors have a high internal
resistance, so they typically can only supply hundreds of mA when shorted.
There's another type called "ultracapacitors" which are made of carbon
aerogel, and can put out many tens of amperes. They're a military
spinoff, and are being considered for brake/boost energy storage in
electric vehicles.

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