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School problem measuring voltage

  1. Jan 12, 2017 #1
    So I'm a freshman in electrical engineering and can't figure this out.

    Using a voltmeter of internal resistance of 5k ohm,measurement of voltage is 4 v between 1 and 2 of one circuit of constant current.Then, using a voltmeter of internal resistance of 9k ohm, between the same points, measurement of voltage is 6 v.
    What will be the result of measurement of voltage using a voltmeter of internal resistance of 15k ohm?
    The answer is 8 v
     
  2. jcsd
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