Voltage Divider Calculator

Voltage divider calculator is used to calculate the divided voltage across the series resistors.


The series resistors

A series resistive circuit comprises two or more resistors which are connected at a common node without having any other connection in between them. The figure below displays two series resistors which are powered by a voltage source.

How to use Voltage divider calculator [An Example]

Let’s consider you are dealing with two resistors which are connected to an input source of 10 V.
Enter the values and adjust the parameters as shown below
Sometimes you might want to connect a load to the resistor. In this case, this voltage divider calculator with load comes handy.

Basic theory of Series Circuits

A series circuit contains two or more elements that are joined in the series configuration. Such circuits have two basic properties.

  1. Current always remains same through all components.
  2. Voltage always divides based on the magnitude of components. The higher the resistance, the higher is the voltage drop across it.

Let’s analyze a series circuit based on these two properties. Consider a circuit having a 10 V source which powers two series resistors of 5 Ω and 10 Ω.voltage-divider-circuitWe can easily apply the Ohm’s law for finding the current in the circuit.

Let’s first solve the series resistors:
Req = R+ R2 = 5 Ω + 10 Ω = 15 Ω

I = Vin / Req = 10 V / 15 Ω = 0.66 A

The equation in the previous line provides the current flowing through the circuit. The next step of our analysis is focused on divided voltage. We can apply the statement V = IR to 5 and 10 Ω resistors for calculating the individual voltage dropped across them. However, this step is tedious, probably in cases where we are not concerned with the current. An alternative solution is to use the voltage divider formula which is a simple equation.

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