electronics course

Discussion in 'Feedback and Suggestions' started by olla, Apr 25, 2010.

  1. olla

    Thread Starter New Member

    Apr 25, 2010
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    the elect. course says silver is the best conductor, is gold the best? is that the reason some connectors are gold plated?
     
  2. retched

    AAC Fanatic!

    Dec 5, 2009
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    Ok, this is a loaded question. If you are talking about economically, its copper.

    Silver is a very good conductor. Gold is a very easy metal to plate and very good marketing ploy.

    Here you go: Silver is the best conductor of heat and electricity:
    http://www.gold-eagle.com/editorials_01/haynes111401.html
     
    Last edited: Apr 25, 2010
  3. Ghar

    Active Member

    Mar 8, 2010
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    Gold oxidizes less than silver so it's better for contacts.
    Platinum oxidizes even less but it's generally more expensive than gold.
     
  4. someonesdad

    Senior Member

    Jul 7, 2009
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    In μΩ*cm, the resistivities are

    Silver 1.59
    Copper 1.72
    Gold 2.44
    Aluminum 2.8

    Thus, you can see that the resistivity of copper is only about 5% less than that of silver. Because the cost is so much less, this makes copper the overwhelming favorite for most conductors. Silver tarnishes too much. Copper also has some oxidation problems, which is why more expensive constructions often gold-plate the copper conductors, as gold resists oxidation/corrosion quite well. As Ghar mentioned, platinum would be good too, but the price of platinum is somewhere between ridiculous and disgusting.
     
  5. loosewire

    AAC Fanatic!

    Apr 25, 2008
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    Does It matter In airline,or military equipment that needs to be reliable
    or does ,as we always hear the stockholder has to make a profit.The
    mission statment of most companies,We work for the stock holder.
    Has your pension plan caused harm to anyone,or does the public care.
     
  6. t06afre

    AAC Fanatic!

    May 11, 2009
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    Last edited: Apr 26, 2010
  7. retched

    AAC Fanatic!

    Dec 5, 2009
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    Loosewire, if you read the link I posted, you will see a new type of silver "wire" that the military is using. It uses silver coated ceramic, cooled with liquid nitrogen to have zero resistance. Its called High Temp Superconductor. Zero Ohms at -195c. Where most superconductors require liquid helium temperatures -276c to achieve zero ohms.

    Neat.

     
  8. Wendy

    Moderator

    Mar 24, 2008
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    The silver is also an insulator in this context, being much higher resistance.
     
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