Deriving Ohm's Law

Discussion in 'Physics' started by RdAdr, Feb 11, 2016.

  1. RdAdr

    Thread Starter Member

    May 19, 2013
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    1
    So consider a resistor made up of one single, ohmic material.

    Thus:
    E(x,y,z) = ro(x,y,z) * J(x,y,z) because the material is ohmic

    and

    ro(x,y,z) = ro = ct because we have one single material.

    Thus: E(x,y,z) = ro * J(x,y,z)

    If E is uniform, then J is also uniform. But what is the condition for E to be uniform?

    Everywhere I see: ''Assuming E to be uniform etc etc.'' when deriving R = ro*L/S

    Must the resistor have a uniform cross-sectional area?
     
    Last edited: Feb 11, 2016
  2. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,804
    1,105
    I've considered it. Now what?
     
  3. RdAdr

    Thread Starter Member

    May 19, 2013
    214
    1
    I've pressed Enter by mistake without writing the full post and it got posted. Now it is written.
     
  4. RdAdr

    Thread Starter Member

    May 19, 2013
    214
    1
    Anyway, I figured it out.
     
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