Enter the voltage across the resistor (volts) and the resistance at each resistor (ohms) into the calculator to determine the Series Current. **In a series circuit, the current is constant across every component.**

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## Series Current Formula

The following formula is used to calculate the Series Current.

**Is = Vs / Rs**

- Where Is is the Series Current (volts)
- Vs is the voltage across the resistor (volts)
- Rs is the resistance at each resistor (ohms)

## How to Calculate Series Current?

The following two example problems outline how to calculate the Series Current.

**Example Problem #1:**

- First, determine the voltage across the resistor (volts). In this example, the voltage across the resistor (volts) is measured to be 50.
- Next, determine the resistance at each resistor (ohms). For this problem, the resistance at each resistor (ohms) is calculated to be 45.
- Finally, calculate the Series Current using the formula above:

Is = Vs / Rs

Inserting the values from above and solving the equation with the imputed values gives:

Is = 50 / 45 = 1.111 (volts)

**Example Problem #2: **

Using the same process as example problem 1, we first define the variables outlined by the formula. In this case, the values are:

voltage across the resistor (volts) = 400

resistance at each resistor (ohms) = 12

Entering these values into the formula above gives :

Is = Vs / Rs = 33.33 (volts)