Finding Resistance of a Voltmeter

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SUMMARY

The discussion focuses on determining the internal resistance of a voltmeter using the formula R = V/I. Given a current of 0.212 mA and an emf of 1.50 V, the calculation requires the application of Ohm's Law. The resistance of the load (Rx) is specified as 7000 Ohms, which is crucial for accurately calculating the voltmeter's internal resistance. Participants emphasize the need for a complete circuit diagram to facilitate the solution process.

PREREQUISITES
  • Understanding of Ohm's Law (V = IR)
  • Familiarity with basic electrical circuit components
  • Knowledge of measuring current and voltage
  • Ability to interpret circuit diagrams
NEXT STEPS
  • Calculate the internal resistance of the voltmeter using the provided current and emf values
  • Explore the implications of voltmeter resistance on circuit measurements
  • Review circuit analysis techniques for series and parallel components
  • Study the effects of load resistance on voltage readings
USEFUL FOR

Students in electrical engineering, physics enthusiasts, and anyone involved in circuit analysis or instrumentation who seeks to understand voltmeter functionality and resistance measurement.

thiefjack
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Homework Statement


I'm trying to find the internal resistance of a Voltmeter.

The current is 0.212 mA which is measured by I. Rx is 7000 Ohms and the emf of the battery is 1.50 V.

Homework Equations



V = IR so R = V/I

The Attempt at a Solution



How can I start it off to find the Voltmeter's resistance? I don't know exactly to accomplish this. Any help would be appreciated.
 

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Hi thiefjack! Can you provide the full question? I think you have extracted just part of it for this post. This circuit diagram won't get you anywhere.

Or maybe this circuit is your attempt at an answer?

What information would you need in order to determine the voltmeter's resistance?
 

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