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

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:

  1. First, determine the total current (amps). In this example, the total current (amps) is measured to be 50.
  2. Next, determine the current across the resistor (amps). For this problem, the current across the resistor (amps) is calculated to be 30.
  3. 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)