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Homework Help: Voltmeter reading problem

  1. Feb 9, 2015 #1
    1. The problem statement, all variables and given/known data
    The voltmeter in the figure below reads 6.2 V. If the vs = 12 V and R1 = 560 Ω, R2 = 470 Ω,
    R3 = 680 Ω, and R4 = 4.7 kΩ, is the voltmeter reading correct?
    2. Relevant equations

    3. The attempt at a solution
    So I thought the voltage in the voltmeter would equal the voltage across the 4.7kohm resistor

    So 12V*4700/(4700+560+470+680)= 8.798 V
    So my answer would be no.

    Is this correct or am I doing it wrong?

    Attached Files:

    • 1f1.png
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  2. jcsd
  3. Feb 9, 2015 #2


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    Gold Member

    HUH ???

    Do you understand how to reduce series and parallel resistors?
    Last edited by a moderator: Feb 9, 2015
  4. Feb 9, 2015 #3
    Opps, should it look more like this?

    R1+R2=1030 ohms
    R3||R4=594 ohms

    12 V * 594/(1030+594)= 4.389 V

    Which is exactly half of my old answer for some reason.
  5. Feb 9, 2015 #4


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    Gold Member

    Now it looks right
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