Voltage divider calculator

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Voltage divider circuit indicating voltage drop across resistor R2





Voltage divider circuit indicating voltage drop across resistor R1


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An interactive voltage divider calculator is given above where you can submit different values of resistances and battery voltage. You also have the option to choose the resistor across which you want the calculator to calculate the voltage. To calculate the voltage drop across a resistor, enter the values of resistor R1 and R2 and the battery voltage. Once you enter these values, press the "Calculate" button and the voltage divider calculator will calculate the voltage drop across the selected resistor.

In order to understand how to calculate voltage divider formula, consider the circuit shown above. Resistors R1 and R2 are connected in series, hence the current flowing through both the resistors would be same. The current flowing through the circuit can be calculated by using the relation I= V/ (R1 + R2).
Now we can calculate the voltage drop across resistor by using Ohm's law as follows.
Voltage drop across resistor R1 will be V1 = (R1 * V) / (R1 + R2).
Voltage drop across resistor R2 will be V1 = (R2 * V) / (R1 + R2).

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