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measuring capacitance.

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Peter Laurence

Joined: 10 Jan 2006
Posts: 50

Posted: Mon Aug 25, 2008 9:53 am Post subject: measuring capacitance.

Bob and others,



Can one determine the inherent capacitance of a container of water with two

metal plates? Formula?

Peter Laurence

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mrspudandcompany(at)veriz
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Posted: Mon Aug 25, 2008 10:36 am Post subject: measuring capacitance.

Can one determine the inherent capacitance of a container of water with two

metal plates? Formula?

Peter Laurence



Peter,

What does this container of water and 2 metal plates have to do with my OBAM

aircraft???

Roger

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Terry Watson

Joined: 09 Jan 2006
Posts: 290
Location: Seattle, WA USA

Posted: Mon Aug 25, 2008 12:34 pm Post subject: measuring capacitance.

Testing capacitance fuel tank gauges, perhaps? 



A little broader focus beyond "..my OBAM aircraft" would be helpful.



Terry

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Peter Laurence

Joined: 10 Jan 2006
Posts: 50

Posted: Mon Aug 25, 2008 1:05 pm Post subject: measuring capacitance.

Roger,



H2 generation

Peter



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mprather(at)spro.net
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Posted: Mon Aug 25, 2008 1:23 pm Post subject: measuring capacitance.

A capacitor is a device which stores electrical energy by maintaining

separation between regions of differing charge - that is, two conductive

plates separated by an insulator.



Most real-world water is at least somewhat conductive (contaminated by

salts).  The amount of contaminant which causes water to ionize and become

conductive is very low.



Coating the metal plates would allow a capacitive system to be built -

keeping there from being a short between the plates.  Water between the

already insulated plates would further change the permittivity of the

system - changing it's capacitance.



So, is this question about a lab environment in which you can setup with

distilled water, and keep it clean?  If so, then it is possible to

calculate the capacitance of system that has metal plates and water as the

dielectric.



If the concern is about how water effects the capacitive senders in a

modern fuel system, I think that's a different issue..

Regards,



Matt-

 	  Quote: 	
		   

 <dr.laurence(at)mbdi.org>

 Bob and others,



 Can one determine the inherent capacitance of a container of water with

 two

 metal plates? Formula?

 Peter Laurence

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mrspudandcompany(at)veriz
Guest

Posted: Mon Aug 25, 2008 1:48 pm Post subject: measuring capacitance.

Testing capacitance fuel tank gauges, perhaps?

		Perhaps not?

A little broader focus beyond "..my OBAM aircraft" would be helpful.

		I thought OBAM aircraft was what this forum was all about!

		Roger

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Terry Watson

Joined: 09 Jan 2006
Posts: 290
Location: Seattle, WA USA

Posted: Mon Aug 25, 2008 2:32 pm Post subject: measuring capacitance.

My RV-8A has capacitance fuel gauges. But then that's MY OBAM aircraft. 



Terry

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rjquillin

Joined: 13 May 2007
Posts: 123
Location: KSEE

Posted: Mon Aug 25, 2008 2:41 pm Post subject: measuring capacitance.

At 10:52 8/25/2008, you wrote:

 	  Quote: 	
		  Can one determine the inherent capacitance of a container of water with two

metal plates? Formula?


	


http://www.pa.msu.edu/courses/2001spring/PHY232/lectures/capacitors/twoplates.html



For DC or low frequencies you can use e= 80 for water.

Look up values here:

http://www.asiinstruments.com/technical/Dielectric%20Constants.htm#Section%20W

Ron Q.

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Peter Laurence

Joined: 10 Jan 2006
Posts: 50

Posted: Tue Aug 26, 2008 9:36 am Post subject: measuring capacitance.

Thanks to all who responded to my capacitance question.



All have been very helpful

Peter

RV9A fuse

Do not archive

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