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Voltmeter reading problem

  • #1
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Homework Statement


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?

Homework Equations


V*Rx/(Ry+Rx)

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?
 

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Answers and Replies

  • #2
phinds
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So 12V*4700/(4700+560+470+680)= 8.798 V
HUH ???

Do you understand how to reduce series and parallel resistors?
 
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  • #3
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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.
 
  • #4
phinds
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Now it looks right
 

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