Capacitors use electric fields (rather than chemical changes, motion, or potential energy) to store energy, and charge and discharge faster than batteries. Ratings are usually in Farads (Coulombs per Volt).
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- 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.
- Green Car Congress: Holden (GM) and CSIRO Working on Next-Gen Supercaps Australian groups partnering on components for electric vehicles.
- Maxwell Licenses Ultracapacitor Technology To Shanghai Group to enhance reliability and efficiency of electric power infrastructure.
- UltraCapacitors and SuperCapacitors Information on how an ultracapacitor works, manufacturers, uses, and links to news.
- Supercapacitor Wikipedia entry includes picture, history, applications, Ragone plot, diagram, links, and current state.
- Ultracapacitors Challenge the Battery article written by chair of group devoted to promoting ultracapacitor technology includes web addresses of makers.
- All About Circuits - Capacitors An introduction to capacitors. Theory, pictures, links to other parts of a web-book of electrical theory.
- The Charge of the Ultra - Capacitors Nanotechnology takes energy storage beyond batteries [IEEE Spectrum]
- The Dark Horse in the Race to Power Hybrid Cars Are ultracapacitors the key to making hybrids king of the auto market? [Scientific American]