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February 1998

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DesignerCouncil <[log in to unmask]>
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Date:
Mon, 9 Feb 1998 16:54:51 -0500
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"DesignerCouncil E-Mail Forum." <[log in to unmask]>, Doug McKean <[log in to unmask]>
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Doug McKean <[log in to unmask]>
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You're on.

Permittivity is also dielectric constant.

Ok, so what?  Time for real simple terms.

Think of it like lens. It's the ability of a material
to *focus* an electric field (electric lines of force)
as a result of electric charges.

The higher the dielectric constant, the better the
capacitor. A material with a dielectric constant or
permittivity of 4 is four times better a capacitor
than say a capacitor with just air between the plates.

The *air* cap will have a voltage breakdown at 1/4
the voltage that the cap with a dielectric constant
has across it. Higher dielectric constants increases
the electrical strength of the material.

You can do the same type of analogy with permeability.
Permeability is the ability of a material to focus
*magnetic* lines of force. And so forth ...

That do it fer ya?

Regards,  Doug

----------
> From: [log in to unmask]
> To: [log in to unmask]
> Subject: [DC] Permittivity
> Date: Monday, February 09, 1998 4:03 PM
>
> To:           IPC
> Date:   2/6/98
> Re:           Permittivity
>
> From:   Mary Sugden                            [log in to unmask]
>         The Copper Connection, Inc.
>         Ph(408) 970-9838  Fx(408) 970-9184
>         hhtp//www.copperconn.com
> ________________________________________________________________
>
> I would like to have a clear and consise definition for the term
> "permittivity" as it relates to dielectric materials.  I have
> read no less than fifty different definitions and descriptions
> and still do not have a clear and consise definition.  In
> several of the references, it simply states, ...see dielectric
> constant.  However, the other descriptions and definitions of
> permittivity lead me to believe there is a subtle difference
> between the two terms.  The definitions for relative dielctric
> constant are fairly clear and consistent between the various
> references I have used, but the definitions for permittivity are
> ambiguous and inconsistent.
>
> For the best definition, I will send the dude or dudette a
> nice bottle of California White Zinfandel
>
> _________________________ Shareware ____________________________
>
>
> "Will you teach your children what we have taught our children?
> That the Earth is our mother?   What befalls the Earth, befalls
> all of the sons and daughters of the Earth.
>
> This we know; The Earth does not belong to man, man belongs to
> the Earth.   All things are connected like the blood that unites
> us all.   Man did not weave the web of life, he is merely a
> strand in it. Whatever he does to the web, he does to himself.."
>
> ...Chief Seattle         In a letter to President Pierce, 1852
>
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