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galvanic reaction

Subject: galvanic reaction
From: "Dr. Phil" <nospam@xxxxxxxxxx>
Date: Thu, 31 Mar 2005 10:53:31 -0500
Newsgroups: alt.security.alarms

Why do manufacturers give us resistors that are made of a different
metal than the copper wire we are using?  High voltage electricians know
that you can't connect an aluminum and copper wire directly to each
other.  Roofers know you can't nail copper flashing with aluminum nails.
Simple moisture in the air can cause galvanic reaction between the
copper wire and whatever the resistors are made out of [looks like
aluminum] causing the least noble metal to deteriorate.  Yes Robert it
does happen, even if you haven't noticed it in your 40 years in the
trade.;)  Any resistor experts out there?  Why are most resistors I have
seen not made out of copper?  Must be some reason.

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