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Homework Help: Ammeter and Voltmeter

  1. Mar 15, 2010 #1
    1. The problem statement, all variables and given/known data
    I'm writing my sources of error for my lab report and I'm just wondering if its true that the ammeter has internal resistance in it, and that this will increase the resistance in the circuit, which will ultimately decrease the current in the circuit?? Does this sound right??

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Mar 15, 2010 #2


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    Homework Helper


  4. Mar 15, 2010 #3


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    Staff: Mentor

    Ideal ammeter has no internal resistance, ideal voltmeter has infinite internal resistance. Real ammeters and voltmeters are not ideal. In effect real ammeter always decreases the current (increasing cirquit resistance), and real voltmeter always lowers the potential (drawing a current).
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