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Power Loss

  1. May 14, 2006 #1
    I have an assignment that requires me to discuss why do we step up voltage when transmitting power over long distance.

    I was told that in having a high voltage you have a low current, which then reduces the power loss. What I do not understand is how does low current relates to the reduction in power loss?
  2. jcsd
  3. May 14, 2006 #2


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    The resistance of a conductor converts electric energy into heat energy (via the collisions of the electrons with the metal lattice). If we use [itex]P = IV[/itex] and [itex]V = IR[/itex] we can show that the power dissapated by the resistance is given [itex]P = I^{2}R[/itex]. Therefore, lowering the current, reduces the power loss.

  4. May 15, 2006 #3


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    Adding to what Hootenanny said, you might also want to visit this site.
    http://www.bsharp.org/physics/stuff/xmission.html" [Broken]
    Last edited by a moderator: May 2, 2017
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