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Homework Help: Voltage - Quick Question

  1. May 22, 2007 #1
    1. The problem statement, all variables and given/known data
    What is wrong with this statement: A charged rod has a voltage of 0.50 A through it. Explain your answer.

    2. Relevant equations

    3. The attempt at a solution
    A charged rod cannot have a voltage through it and voltage is not measured in A. Right? I know that to have a voltage, there must be a potential difference determined by two different charges. But what if the rod was a magnet? Would there be a voltage through a magnet?
  2. jcsd
  3. May 22, 2007 #2
    You're right, voltage is not measured in Amps. Current is. Is this supposed to be a trick question, or is it just to see if you are paying attention?
  4. May 22, 2007 #3
    I don't know (?). Is it a trick question? :biggrin:
  5. May 23, 2007 #4
    I think the only problem with the statement is the Amps bit. You're right that for there to be a potential difference you need a difference in charge, but if all the charge in the rod were at one end it could have a potential difference across it.

    Magnetic "voltage" is different to electric voltage. You're right that a bar magnet would, in a sense, have a magnetic potential across it as it has two poles.
  6. May 23, 2007 #5
    Thank you. That clarifies my understand of voltage, finally.
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