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More length in wire

Discussion in 'General Electronics Discussion' started by Life24, Sep 11, 2015.

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  1. Life24

    Life24

    6
    1
    Sep 10, 2015
    Hello,
    When we increase length of wire , we have voltage drop. why? o_O
    Thanks
     
  2. donkey

    donkey

    1,293
    56
    Feb 26, 2011
    because simply put, a wire has resistance. over long lengths its noticeable. voltage and current can be affected.
     
  3. Ratch

    Ratch

    1,093
    334
    Mar 10, 2013
    You should be more specific. For instance, if I apply 12 volts across 1200 feet of wire, then there will be a 12 volt drop across the total 1200 feet of wire. Now, if I increase the length of wire to 2400 feet, then there still will be a 12 volt drop across the total wire. Is that what you wanted to know?

    Ratch
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

    11,453
    2,630
    Nov 17, 2011
    I doubt it. Donkey's answer is more to the point. Voltage drop along a length of wire is the product of the current through this wire and the resistance of the wire: V=I*R.
    Therefore voltage drop increases if the resistance increases aka longer wire (of the same thickness, of course) or more current (higher load).
    Essentialy the wire and the load form a resistive voltage divider
     
  5. davenn

    davenn Moderator

    13,813
    1,945
    Sep 5, 2009
    you and Donkey may well be right

    But I suggest it seems ( as Ratch hinted at) that the Op doesn't really understand the meaning of voltage drop
    considering how vague the question was


    Dave
     
  6. Harald Kapp

    Harald Kapp Moderator Moderator

    11,453
    2,630
    Nov 17, 2011
    Right, especially in view of his other thread which I just came across.
     
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