Enter the current (amps) and up to 3 different resistances (ohms) into the calculator to determine the Total Power. 

Total Power Formula

The following formula is used to calculate the Total Power. 

Pt = I^2*R1+I^2*R2+I^2*R3

  • Where Pt is the Total Power (watts)
  • I is the current (amps) 
  • R1 is the up to 3 different resistances (ohms) 

How to Calculate Total Power?

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

Example Problem #1:

  1. First, determine the current (amps). In this example, the current (amps) is measured to be 10.
  2. Next, determine the different resistances (ohms). For this problem, the different resistances (ohms) are calculated to be 50,30, and 20.
  3. Finally, calculate the Total Power using the formula above: 

Pt = I^2*R1+I^2*R2+I^2*R3

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

Pt = 10^2*50+10^2*30+10^2*20 = 10,000 (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:

current (amps) = 50

3 different resistances (ohms) = 6,7,8

Entering these values into the formula or calculator above gives us:: Pt = 50^2*6+50^2*7+50^2*8 = 52,500 (watts)