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Heat dissipated

  1. Oct 11, 2009 #1
    Does the heat dissipated in a resistor necessarily depend on the direction of current through it? As far as I know the heat dissipated equals square of the magnitude of current thru resistor multiplied the resistance of the resistor. But it seems direction matters.
     
  2. jcsd
  3. Oct 11, 2009 #2

    Doc Al

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    Staff: Mentor

    Why do you think direction matters? Can you give an example?
     
  4. Oct 11, 2009 #3

    lewando

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    Gold Member

    Squaring the current makes the direction irrelevant. Are you imagining a case where it would matter?
     
  5. Oct 11, 2009 #4
    Peltier effect, Thomson effect. There's both Peltier heating and Peltier cooling depending on the direction of current.
     
  6. Oct 11, 2009 #5

    Doc Al

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    You won't find such effects with an ordinary resistor. You need a semiconductor or a junction of dissimilar metals.
     
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