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'[EE] Solar Cell Question'
2005\04\04@180140 by David Minkler

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Russell McMahon wrote:

> Water analogy.
> Violtage is head of water (voltage) in a reservoir (battery) OR height
> a pump water to (generator or battery voltage).
> Current is current flow (amps) and resistance is the resistance to
> water flow - small diameter pipe is large resistance.
> Capacitor is a cylinder in the pipeline with a rubber sheet of given
> flexibility and strength across the middle blocking steady flow.
> Inductor is 9approximately) and air dome in a water pipeline.

A much better analogy of a simple inductor is a positive displacement
pump (back-drivable, gear pump ?) driving / driven by a flywheel.

Dave


2005\04\04@192542 by Martin K

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David Minkler wrote:

>
> A much better analogy of a simple inductor is a positive displacement
> pump (back-drivable, gear pump ?) driving / driven by a flywheel.
>
> Dave
>
>

And a capacitor is an accumulator. ;)

--
Martin K
http://wwia.org/sgroup/biofuel/

2005\04\04@200854 by David Minkler

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I liked Russell's flexible membrane, blocking flow.  That models the
displacement current exhibited by a capacitor better than a hydraulic
accumulator.

Dave

Martin K wrote:

{Quote hidden}

2005\04\04@204135 by Martin K

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Well, consider it a DC-only capacitor then!

David Minkler wrote:
{Quote hidden}

--
Martin K
http://wwia.org/sgroup/biofuel/

2005\04\05@031336 by Russell McMahon

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>> Water analogy.

>> Inductor is (approximately) and air dome in a water pipeline.

> A much better analogy of a simple inductor is a positive
> displacement pump (back-drivable, gear pump ?) driving / driven by a
> flywheel.

Both have their good and bad points. An inductor does some very
unintuitive things that an air dome arguably models better. eg it has
infinite impedance to an instantaneous current step. And the related
effect of ringing in voltage to whatever voltage is required to
maintain the current initially when the drive is removed is not at all
well modelled by a driven flywheel analogy. Neither is perfect but the
air dome model has its merits.



       RM

2005\04\05@035440 by Wouter van Ooijen

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> And the related
> effect of ringing in voltage to whatever voltage is required to
> maintain the current initially when the drive is removed is
> not at all
> well modelled by a driven flywheel analogy.

Isn't it? When I imagine a flywheel with a pump and you suddenly try to
block the incomming and/or outgoing water flow you will get (near)
infinite pressure caused by the inertia of the flywheel.

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu


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