Practicality of using capacitors as a power source

[Rui Maciel]

Bob F wrote:

But batteries would regulate the voltage. A capacitor running a lightbulb
would have a huge varience in light output as the voltage drops. A
batterys voltage would be much more constant. Plus it would last way
longer per charge. But then, the capacitor could be charged/drained
thousands of times more.

We just need better capacitors.

Isn't it possible to at least limit the voltage output of a capacitor?


Rui Maciel

 

[Winston]

Bob F wrote:

(...)

We just need better capacitors.

The capacitors are all right.
We need better batteries more.


--Winston

 

[Frnak McKenney]

On Mon, 12 Sep 2011 21:58:28 -0700, Bob F <bobnospam@gmail.com> wrote:

Rui Maciel wrote:
Wanderer wrote:
Here's a supercap from digikey 1 Farad 6.3V around 4 dollars.

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&
name=604-1018-ND

We just need better capacitors.

Hey, Bob.

How about a 2600F 2.5V cap for $10?

Maxwell 2600 Farad 2.5VDC Boostcap
http://www.goldmine-elec-products.com/prodinfo.asp?number=G17960

A couple of these hould be enough to power a white LED for some
time, yes?

Enjoy...


Frank McKenney
--
Reading achievement will nor advance significantly until schools
recognize and act on the fact that it depends on the possession of
a broad but definable range of diverse knowledge. The effective
teaching of reading will require schools to teach the diverse,
enabling knowledge that reading requires.
-- E.D. Hirsch, Jr./The Knowledge Deficit
--
Frank McKenney, McKenney Associates
Richmond, Virginia / (804) 320-4887
Munged E-mail: frank uscore mckenney aatt mindspring ddoott com

 

[Michael A. Terrell]

Rui Maciel wrote:

Bob F wrote:

But batteries would regulate the voltage. A capacitor running a lightbulb
would have a huge varience in light output as the voltage drops. A
batterys voltage would be much more constant. Plus it would last way
longer per charge. But then, the capacitor could be charged/drained
thousands of times more.

We just need better capacitors.

Isn't it possible to at least limit the voltage output of a capacitor?

How much of the stored energy do you want to waste?


--
You can't have a sense of humor, if you have no sense.

 

[Michael A. Terrell]

Bob F wrote:

We just need better capacitors.

First, you'll need to get rid of those pesky laws of physics that
tell you how they work.


--
You can't have a sense of humor, if you have no sense.