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4hv.org :: Forums :: General Science and Electronics
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Leakance

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Proud Mary
Tue Sept 15 2009, 02:16PM Print
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
 		Could someone kindly explain in a few simple sentences what we mean by the property of leakance, and it's basic formulae. Thank you,
Harry.
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Mads Barnkob
Tue Sept 15 2009, 02:37PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
 		I guess you mean in electronics, else there is also thermal conductivity.

Link2
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Dr. Slack
Tue Sept 15 2009, 03:27PM
Dr. Slack Registered Member #72 Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
 		Some context would be handy here, Harry. Where have you read it? What field does it apply to? Do you know any of the units that go into its definition? "Leakage" has applications in thermal, electrical, hydraulic etc fields, though the -ance bit at the end seems to rule out the wet one of those.
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Mads Barnkob
Tue Sept 15 2009, 03:34PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
 		Leakance –noun Electricity.
the reciprocal of the resistance of insulation.
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Proud Mary
Tue Sept 15 2009, 04:17PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Mads Barnkob wrote ...

Leakance –noun Electricity.
the reciprocal of the resistance of insulation.

Thanks Mads. Does it have its own units like mhos, or do we talk about it in percentages, and such?
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Proud Mary
Tue Sept 15 2009, 04:27PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
 		Slacks, leakance as a property, for example, of the glass outside of a thermionic device, where there is an anode top-cap, then glass of resistance, say, 10T, and then the kathode etc at the bottom. So is leakance a ratio between internal (desired) and external (unwanted) resistance in such a case? I'm still not quite clear about it.
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Electroholic
Tue Sept 15 2009, 04:36PM
Electroholic Registered Member #191 Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
 		never heard of it, but if its 1/ohm, the unit would be Siemens also known as conductance.
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Mads Barnkob
Tue Sept 15 2009, 05:04PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Harry wrote ...

Mads Barnkob wrote ...

Leakance –noun Electricity.
the reciprocal of the resistance of insulation.

Thanks Mads. Does it have its own units like mhos, or do we talk about it in percentages, and such?

It should all be in the wiki article I also linked to
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Sulaiman
Tue Sept 15 2009, 07:21PM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
 		This is the first time I've come across the word 'leakance'
it sounds like leakage-conductance .
Dictionary.com says "the reciprocal of the resistance of insulation."
So It must be.

Conductance unit siemens = Amps/Volt.

So for 'leakance' of glass it may be uA/kV = nano-siemens
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Dr. Slack
Tue Sept 15 2009, 09:15PM
Dr. Slack Registered Member #72 Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
 		I don't know why anybody would want to invent a new term Hazzer, conductance is well understood. If I wanted to know how much current flowed through an insulator, I'd measure it as amps per volt, and call it conductance. Would I ratio it to some undefined internal work current? Not if I was measuring an insulator or a valve base, but perhaps if I was measuring something for which the value of the work current was implicityl defined, like a valve. Indeed, that implicitly defines the voltage across the insulator as well. The -ance suffix makes it sound like it has dimensions, so leakance is a poor choice to imply a dimensionless ratio, if it is indeed the ratio of loss to work current. Loss ratio could be an alternative term.
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