Answer: Understanding Multirange Voltmeter Internal Wiring

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SUMMARY

The discussion focuses on the internal wiring of a three-scale voltmeter, specifically addressing the calculation of resistances R1, R2, and R3 for voltage ranges of 3.00 V, 15.0 V, and 150 V. The relationship between voltage, current, and resistance is established through Ohm's Law (V = I/R) and the voltmeter's moving coil resistance (Vcoil = IgRcoil). Participants emphasize the need to derive the overall resistance of the meter for each specified voltage range.

PREREQUISITES
  • Understanding of Ohm's Law (V = I/R)
  • Familiarity with voltmeter operation and internal circuitry
  • Knowledge of electrical resistance and its measurement
  • Basic principles of series and parallel resistances
NEXT STEPS
  • Calculate the resistances R1, R2, and R3 using the given voltage ranges
  • Explore the concept of moving coil meters and their applications
  • Learn about series and parallel resistor combinations for overall resistance calculations
  • Investigate the impact of meter resistance on circuit performance
USEFUL FOR

Electrical engineering students, technicians working with voltmeters, and anyone involved in circuit design and analysis will benefit from this discussion.

parm09
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Can someone please help me out with this problem? I am not sure if what I am doing

question:
The figure below shows the internal wiring of a "three-scale" voltmeter whose binding posts are marked , 3.00 V, 15.0 V, and 150 V. When the meter is connected to the circuit being measured, one connection is made to the post marked + and the other to the post marked with the desired voltage range. The resistance of the moving coil is Rg, and a current of I in the coil causes it to deflect full scale.

Picutre:
yf_Figure_26_64.jpg


we know v=i/r and Vcoil=IgRcoil

dont know where to begin
 

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What is required in the problem?
 
sorry forgot to mention that. you have to find R1, R2, R3. Also find the overall resistance of the meter on a 3.00, 15.0, 150 V-range
 
Why don't you state the entire text of the problem, verbatum? It should have a question mark somewhere to be answered.
 
What is R1, R2, R3 and what is the overall resistance of the meter on a 3.00, 15.0, 150 V-range? that what its asking
 

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