Enter the true voltage (amps) and the true resistance (ohms) into the calculator to determine the True Power. 

True Power Formula

The following formula is used to calculate the True Power. 

Pt = E^2/ R
  • Where Pt is the True Power (watts)
  • E is the true voltage (amps) 
  • R is the true resistance (ohms) 

To calculate the true power, square the true voltage, then divide by the true resistance.

How to Calculate True Power?

The following two example problems outline how to calculate the True Power.

Example Problem #1:

  1. First, determine the true voltage (amps). In this example, the true voltage (amps) is measured to be 43.
  2. Next, determine the true resistance (ohms). For this problem, the true resistance (ohms) is calculated to be 85.
  3. Finally, calculate the True Power using the formula above: 

Pt = E^2/ R

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

Pt = 43^2/ 85 = 21.75 (watts)

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:

true voltage (amps) = 58

true resistance (ohms) = 60

Entering these values into the formula or calculator above gives us:: Pt = 58^2/ 60 = 56.06 (watts)