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Resistance and heat

  1. Sep 16, 2009 #1
    is this statement true:
    the hotter the wire the greater the resistance (when relating to circuits)
     
  2. jcsd
  3. Sep 16, 2009 #2

    f95toli

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    For most materials yes.
     
  4. Sep 16, 2009 #3

    f95toli

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    For most materials yes.
    It would e.g. be correct for metals; but not neccesarily for a semiconductor or an insulator.
    Although you wouldn't normally use these as conductors in a circuit.
     
  5. Sep 16, 2009 #4
    Note that the heating power varies as I-squared R, so I would first say "the hotter the wire, the greater the current".
    Bob S
     
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