Enter the power loss (watts) and the resistance (ohms) into the calculator to determine the AC Current. 

AC Current Formula

The following formula is used to calculate the AC Current. 

Iac = SQRT ( P/R)
  • Where Iac is the AC Current (amps)
  • P is the power loss (watts) 
  • R is the resistance (ohms) 

To calculate AC current, divide the power loss by the resistance, then take the square root of the result.

How to Calculate AC Current?

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

Example Problem #1:

  1. First, determine the power loss (watts). In this example, the power loss (watts) is measured to be 752.
  2. Next, determine the resistance (ohms). For this problem, the resistance (ohms) is calculated to be 50.
  3. Finally, calculate the AC Current using the formula above: 

Iac = SQRT ( P/R)

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

Iac = SQRT ( 725/50) = 3.807 (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:

power loss (watts) = 895

resistance (ohms) = 40

Entering these values into the formula above gives : 

Iac = SQRT ( 895/40) = 4.732(amps)