Re: capacitances in parallel

On Thu, 04 Jan 2007 00:06:25 GMT, "Bob Myers"
<nospamplease@xxxxxxxxxxxxxxx> wrote:


"John Larkin" <jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:q27op2lf95fur1qkgnhcu9i2l618ghdn76@xxxxxxxxxx
Caps have the unique ability to store energy in isolation.



And inductors don't?

---
Not after the charging source is disconnected, I think.

NMR/MRI magnets are installed, cooled down, and charged with a big
power supply. The installer then shorts the magnet, puts the power
supply into his truck, and drives away. As long as the helium is kept
topped off, every couple of months, the current circulates and the
field stays.

And inductor is the dual of a capacitor. Both store energy.

While both store energy, and it IS possible to come up
with various scenarios involving superconductors and the
like wherein inductive storage would work "in isolation,"
I think that in a practical, real-world sense this IS a significant
difference between capacitors and inductors. After all, how
many "super-inductors" do you see being used, essentially,
as batteries? :-)

Bob M.




There have been some plans for, and small-scale prototypes of,
superconductive electrical energy storage facilities. Google
"superconductive energy storage" for lots of interesting stuff.

I've never heard of capacitors being considered on this scale.

John

.

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