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October 2006

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Subject:
From:
Kevin Glidden <[log in to unmask]>
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Date:
Tue, 24 Oct 2006 15:24:50 -0400
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Arlene,

Simply put, the capacitor's function is to store electricity.  The basic
construction is two electrode plates facing each other, but separated by an
insulator (dielectric).  The capacitance is dictated by the area of the
plates and the "strength" of the dielectric.

The reason some capacitors have polarity and some do not is because
different kinds of capacitors use different materials for the dielectric.

Electrolytic capacitors use a very thin dielectric, so they are not as
"strong".  The trade off is that it can be packaged tightly it really tight
and get a lot of capacitance in a small package.

Other capacitors use a polyester film or mica as the dielectric, which is
very strong, but also thicker, so you get less capacitance in a given
package size.

Kevin

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Cicchiani, Arlene M.
Sent: Tuesday, October 24, 2006 2:37 PM
To: [log in to unmask]
Subject: [TN] capacitor polarity or not

As a trainer, how would I explain to a manufacturer, in simple terms, the
reason some capacitors have polarity, and some do not.

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