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Potential Differences

Discussion in 'Homework Help' started by 1jtheobald, Feb 3, 2004.

  1. 1jtheobald

    Thread Starter New Member

    Feb 3, 2004
    In lab this week, we constructed a potentiometer. And now I am terribly confused--

    Why must the potential difference supplied by a power supply be larger than the voltage source in series with a galvonometer?
    Why is it not necessary to know the exact voltage across the length of the wire in the potentiometer?
    Thanks :)
  2. xode

    New Member

    Feb 15, 2004
    potentiometer = variable resistor
    potential difference = voltage

    ...or perhaps you mean something else by potentiometer. Could you please explain your problem further.
  3. Dave

    Retired Moderator

    Nov 17, 2003
    I more suspect that it should be voltage drop across the wire in the potentiometer.