Enter the total current (amps) and the current across the resistor (amps) into the calculator to determine the Shunt Current.

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## Shunt Current Formula

The following formula is used to calculate the Shunt Current.

Is = It - Ir

- Where Is is the Shunt Current (amps)
- It is the total current (amps)
- Ir is the current across the resistor (amps)

To calculate the shunt current subtract the current across the resistor from the total current.

## How to Calculate Shunt Current?

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

**Example Problem #1:**

- First, determine the total current (amps). In this example, the total current (amps) is measured to be 50.
- Next, determine the current across the resistor (amps). For this problem, the current across the resistor (amps) is calculated to be 30.
- Finally, calculate the Shunt Current using the formula above:

Is = It – Ir

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

Is = 50- 30= 20 (amps)

**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:

total current (amps) = 40

current across the resistor (amps) = 12

Entering these values into the formula or calculator above gives us:: Is = 40 – 12 = 28 (amps)