Galvanometer to Voltmeter Question

Click For Summary

Homework Help Overview

The discussion revolves around converting a galvanometer into a voltmeter by determining the necessary series resistance for a specified voltage. The subject area includes electrical circuits and instrumentation.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the relationship between current, voltage, and resistance in the context of the galvanometer's specifications. Some express uncertainty about how to differentiate between the voltage in the formula and the required voltage for the problem. Others seek guidance on how to begin approaching the problem.

Discussion Status

The conversation is ongoing, with some participants offering hints and suggestions for initial steps. There is a recognition of the need for further exploration of the concepts involved, particularly regarding the maximum voltage the galvanometer can handle.

Contextual Notes

Participants note the lack of specific information regarding the maximum voltage tolerance of the galvanometer coil, which is relevant to the problem at hand.

physics_girl
Messages
4
Reaction score
0
A galvanometer of coil resistance 50 ohms deflects full scale for a current of 3.5 mA. What series resistance should be used with this galvanometer to construct a voltmeter which deflects full scale for 35 Volts?
 
Physics news on Phys.org
Welcome to the forums. There are people here who will be elbowing each other out of the way in order to help you with your problems in Physics. But first, you have to follow our guidelines.

https://www.physicsforums.com/showthread.php?t=94379

We will not do your work for you.
 
Capacitors in Parallel

A 9.0 microFaraday and 4.0 microFaraday are connected in parallel, and this combination is connected in series with 12.0 microFaraday capacitor.

1. What is the net capacitance?
2. if 32 V is applied across the whole network, calculate the voltage
across each capacitor.
 
These two questions are the only two in my assignment that I don't know how to approach. I would appreciate some guidance as to how to begin.
 
Begin by opening up the textbook and reading the section on ammeters and voltmeters.
Hint: current of 3.5 mA, voltage 35 V, resistance ?
Then read the section on capacitors in parallel.
 
my partial solutions are too long to type out...
anyways, here is what I have so far... I know its incorrect because it does not differentiate between the Voltage in V=IR and the voltage I need to obtain in the question, the 35.0V...

the text says little to do this problem, it does however mention the maximum voltage the coil can tolerate.. and is also stated in units of Ohms/Volts...which I am not given in the question...

so...this has been my attempt so far...I don't really know how to proceed...
 
Answer the question contained in my hint.
 

Similar threads

A Galvanometer of Coil Resistance 50 Ω Deflects Full Scale....
  • · Replies 2 ·
Replies
2
Views
3K
Are there 2 correct answers to this transformer homework problem?
  • · Replies 33 ·
2
Replies
33
Views
4K
How Do You Calculate the Series Resistance for a Voltmeter Using a Galvanometer?
  • · Replies 4 ·
Replies
4
Views
2K
Value of resistor for full scale deflection with 10A
  • · Replies 1 ·
Replies
1
Views
2K
Voltmeter readings for this circuit with switches
  • · Replies 17 ·
Replies
17
Views
2K
Converting a galvanometer to ammeter and voltmeter.
  • · Replies 5 ·
Replies
5
Views
4K
The sensitivity of the galvanometer
  • · Replies 3 ·
Replies
3
Views
3K
Voltage that would produce full-scale deflection of a meter
  • · Replies 18 ·
Replies
18
Views
7K
Finding the maximum value of current
  • · Replies 5 ·
Replies
5
Views
4K
The REAL difference between a Galvanometer and an Ammeter
  • · Replies 6 ·
Replies
6
Views
3K