What Value Of R Will Make Vout Vin 15

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When it comes to understanding electronic circuits, one of the fundamental principles is the relationship between input voltage and output voltage. Today, I want to delve into the topic of finding the value of r that will make the output voltage (vout) equal to 15 times the input voltage (vin). This is an important concept in electronics and can be incredibly useful in practical circuit design.

The Challenge: Finding the Value of r

Our goal is to find the resistance value of r in a simple circuit that will produce an output voltage that is 15 times the input voltage. This can be achieved through the use of a voltage divider circuit. In a voltage divider, the output voltage is determined by the ratio of the two resistors in the circuit, as well as the input voltage. By manipulating this ratio, we can achieve our desired output voltage.

Let’s consider the voltage divider formula:

vout = vin * (r2 / (r1 + r2))

Where r1 and r2 are the two resistors in the voltage divider circuit. Our task is to find the value of r that will satisfy the condition vout = 15 * vin.

By rearranging the formula, we can express r2 in terms of r1 and r:

r2 = r * r1 / (r - r1)

Now, we substitute this expression for r2 back into the voltage divider formula and solve for the condition vout = 15 * vin.

After solving, we find the value of r1 to be:

r1 = 14r / 15

Therefore, the value of r1 will be 14r / 15.

Putting It Into Practice

Understanding the relationship between resistances in a voltage divider circuit and the resulting output voltage is crucial for any electronics enthusiast. By utilizing the derived formula for r1, we can easily determine the required resistor values to achieve the desired output voltage in our circuits.


Exploring the concept of finding the value of r that will make the output voltage vout 15 times the input voltage vin has shed light on the intricate relationship between resistors and voltage in electronic circuits. This knowledge is essential for anyone working with circuit design and provides valuable insight into the practical application of theoretical concepts. I hope this article has been enlightening, and I encourage you to experiment with voltage dividers to further solidify your understanding of this fundamental principle in electronics.