Calculate Rsh and R1: 3V Meter Movement

  • Thread starter cyberjupiter
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In summary, the problem involves using a 1mA meter movement with an internal resistance of 50 Ohm and a battery voltage of 3V. The goal is to calculate the values of R1 and Rsh. The equations Vsh = Vim and IshRsh = ImRm are provided. The student is confused about the meaning of half scale deflection and the value of I. They do not have a diagram for reference.
  • #1
cyberjupiter
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Homework Statement



A 1mA meter movement with an internal resistance of 50 Ohm is to be used. The battery voltage is 3V. Half scale deflection is 0.5 Ohm. Calculate the value of R1 and Rsh.

Homework Equations



Vsh = Vim

IshRsh = ImRm

The Attempt at a Solution



I don't understand what it means by half scale deflection 0.5 Ohm. I thought scale deflection is in ampere. In order to find Ish I first need to know the value of I but I don't know what is I.
 
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  • #2
cyberjupiter said:

Homework Statement



A 1mA meter movement with an internal resistance of 50 Ohm is to be used. The battery voltage is 3V. Half scale deflection is 0.5 Ohm. Calculate the value of R1 and Rsh.

Homework Equations



Vsh = Vim

IshRsh = ImRm

The Attempt at a Solution



I don't understand what it means by half scale deflection 0.5 Ohm. I thought scale deflection is in ampere. In order to find Ish I first need to know the value of I but I don't know what is I.

Yeah, the question is a little confusing at first. Is there a figure or other drawing that you can post that shows what R1 and Rsh are?
 
  • #3
I'm sorry but i don't have any diagram given. Only that question is given.
 

FAQ: Calculate Rsh and R1: 3V Meter Movement

1. What is the purpose of calculating Rsh and R1 for a 3V meter movement?

Calculating Rsh and R1 for a 3V meter movement allows us to determine the internal resistance of the meter and the resistance of the external circuit being measured. This information is crucial for accurately interpreting the readings of the meter.

2. How do I calculate Rsh and R1?

To calculate Rsh and R1, you will need to measure the voltage across the meter movement and the current flowing through it. Then, use Ohm's Law (R = V/I) to calculate Rsh (using the voltage across the meter) and R1 (using the total current flowing through the circuit).

3. What is the significance of Rsh and R1 in a 3V meter movement?

Rsh and R1 determine the sensitivity and accuracy of the meter movement. A lower Rsh will result in a more sensitive meter, while a higher R1 will result in a more accurate reading. It is important to find a balance between the two for optimal performance.

4. Can Rsh and R1 be adjusted?

Yes, Rsh and R1 can be adjusted by changing the resistors in the external circuit. By carefully selecting and adjusting these resistors, we can optimize the performance of the meter movement for specific measurements.

5. What factors can affect the accuracy of the calculated Rsh and R1?

The accuracy of the calculated Rsh and R1 can be affected by factors such as temperature, aging of the meter movement, and fluctuations in the power source. It is important to regularly calibrate the meter and make adjustments as needed to ensure accurate readings.

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