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Re: [Phys-L] batteries vs capacitors



Think about why you like a big cap to dump energy into when regeneratively
braking an electric or hybrid car.

Dan MacIsaac, Associate Professor of Physics, SUNY-Buffalo State College
462SciBldg BSC, 1300 Elmwood Ave, Buffalo NY 14222 USA 1-716-878-3802
<macisadl@buffalostate.edu> <http://PhysicsEd.BuffaloState.edu>
Physics Graduate Coordinator & NSF Investigator for ISEP (MSP) and Noyce

On Jan 29, 2014, at 12:38 PM, brian whatcott <betwys1@sbcglobal.net> wrote:

On 1/29/2014 10:58 AM, Paul Lulai wrote:
Hi.
I am wondering about the tradeoffs associated with using a capacitor vs a rechargeable battery. /snip/
I am not sure of the tradeoffs associated with storing the energy in a rechargeable battery vs a capacitor.

Any insight?

Thanks for the help.
Paul.
Storage efficiency of the capacitor is higher.
Lifetime in terms of charge/discharge cycle count is higher for the capacitor
Cost is higher for the capacitor
Voltage versus discharge at constant rate graphs differently.
Stored energy density higher for the rechargeable (??)

Brian Whatcott Altus OK

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