Calculate voltage and position of the slider

In summary, the conversation discusses a question about the correctness of work and the use of an unloaded potential divider in dividing voltage. The same current flows through both series resistors in this scenario. Additionally, there is a mention of an alternative method for finding the answer in part b.
  • #1
Edy56
38
5
Homework Statement
A total resistance potentiometer is used in the circuit in Figure 1
R POT = 10 kΩ which changes linearly from position 0 to position 1. If R= 5 kΩ, VCC= 5 V, determine:
(a) voltage value V OUT when the slider of the potentiometer is in position 0.5;
(b) position the potentiometer slider so that V OUT= 3 V.
Relevant Equations
None
Is my work correct?
I got confused whether the current Splits or not, but i decided against it.
IMG_20230604_224627.jpg
 
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  • #2
Edy56 said:
Is my work correct?
Yes.

Edy56 said:
I got confused whether the current Splits or not, but i decided against it.
An unloaded potential divider, divides the voltage.
The same current flows through both series resistors.

For part b, I solved it differently, to get the same answer.
Computed current; i = (5V - 3V ) / 5k ;
Then R = 3V / i ;
 
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Likes Edy56
  • #3
Baluncore said:
Yes.An unloaded potential divider, divides the voltage.
The same current flows through both series resistors.

For part b, I solved it differently, to get the same answer.
Computed current; i = (5V - 3V ) / 5k ;
Then R = 3V / i ;
Thank you
 

FAQ: Calculate voltage and position of the slider

How do I calculate the voltage across a potentiometer?

To calculate the voltage across a potentiometer, you can use the voltage divider formula: \( V_{out} = V_{in} \times \frac{R_2}{R_1 + R_2} \), where \( V_{in} \) is the input voltage, \( R_1 \) is the resistance from the wiper to one end of the potentiometer, and \( R_2 \) is the resistance from the wiper to the other end.

How can I determine the position of the slider on a potentiometer?

The position of the slider on a potentiometer can be determined by the ratio of the resistances. If you know the total resistance \( R_{total} \) of the potentiometer and measure the resistance from one end to the wiper \( R_w \), the position \( p \) can be calculated as \( p = \frac{R_w}{R_{total}} \times 100% \).

What is the relationship between the slider position and the output voltage in a potentiometer?

The output voltage of a potentiometer is directly proportional to the position of the slider. If the slider is at the midpoint, the output voltage will be approximately half of the input voltage, assuming a linear potentiometer. This relationship is given by \( V_{out} = V_{in} \times \frac{Position}{100} \), where Position is the percentage position of the slider.

Can I calculate the position of the slider if I only know the output voltage and input voltage?

Yes, you can calculate the position of the slider using the output and input voltages. The position \( p \) can be found using the formula \( p = \frac{V_{out}}{V_{in}} \times 100% \). This formula assumes a linear potentiometer.

What tools or instruments do I need to measure the voltage and position of the slider on a potentiometer?

To measure the voltage across a potentiometer, you need a voltmeter or a multimeter set to measure voltage. To determine the position of the slider, you can use an ohmmeter or a multimeter set to measure resistance. By measuring the resistance from the slider to each end, you can calculate the position as described earlier.

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