Voltage Divider

  • #1
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Homework Statement



How do you measure the output of a voltage divider with real voltmeters that have effective resistances

Homework Equations





The Attempt at a Solution



I know that for an ideal voltmeter (one with infinite resistance), the voltage divider is R2/(R1+R2), but I don't know what to do when the voltmeters have effective resistances. Any help would be great!
 

Answers and Replies

  • #2
9
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Instead of considering the voltmeter as an effective "open circuit" at the point of measurement, which is equivalent to an infinite paralel resistance, substitute it for (i.e. model it as) a finite resistance, say Rv.
 

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