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All About Circuits - Capacitors
An introduction to capacitors. Theory, pictures, links to other parts of a web-book of electrical theory.

Capacitors, Tutorial
Includes history, types, color codes, illustrations, and formulae.

Capacitors: What Good Are They?
Short description of a fundamental capacitor, and units used to measure capacitance. Illustrations of capacitors in electronic circuits, with animation.

Float like a battery, sting like a capacitor
Story about 1800-μF, 50V supercapacitor made to fit in a 2325 (button) cell holder includes contact info and pdf version. (April 15, 2004)

Green Car Congress: Holden (GM) and CSIRO Working on Next-Gen Supercaps
Australian groups partnering on components for electric vehicles. (November 19, 2004)

Los Alamos researchers charge ahead in ultracapacitors
United States national laboratory press release announcing device capable of more charge-discharge cycles.

Maxwell Licenses Ultracapacitor Technology To Shanghai Group
to enhance reliability and efficiency of electric power infrastructure. (April 20, 2006)

Maxwell Technologies - Ultracapacitor Overview
PowerCache ultracapacitors claim up to 100 times the energy of conventional capacitors and ten times the power of ordinary batteries.

Supercapacitor
Wikipedia entry includes picture, history, applications, Ragone plot, diagram, links, and current state.

Supercapacitors at CNR-ITAE. Italy
An overview of research in nanostructured materials for supercapacitors.

Tavrima Canada Ltd.
Largest and most powerful supercapacitors. New energy storage technology suited for uses needing repeated bursts of power for fractions of a second to several minutes.

The Charge of the Ultra - Capacitors
Nanotechnology takes energy storage beyond batteries [IEEE Spectrum] (November 15, 2007)

The Dark Horse in the Race to Power Hybrid Cars
Are ultracapacitors the key to making hybrids king of the auto market? [Scientific American] (August 28, 2007)

UltraCapacitors and SuperCapacitors
Information on how an ultracapacitor works, manufacturers, uses, and links to news.

Ultracapacitors Challenge the Battery
article written by chair of group devoted to promoting ultracapacitor technology includes web addresses of makers.

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