Enter the root mean square current (amps) and the resistance (ohms) into the calculator to determine the Average Power.

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## Average Power Formula

The following formula is used to calculate the Average Power.

P = Irms^2 * R

- Where P is the Average Power (watts)
- Irms is the root mean square current (amps)
- R is the resistance (ohms)

To calculate average power, multiply the root mean square current squared by the resistance.

## How to Calculate Average Power?

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

**Example Problem #1:**

- First, determine the root mean square current (amps). In this example, the root mean square current (amps) is measured to be 1100.
- Next, determine the resistance (ohms). For this problem, the resistance (ohms) is calculated to be 1.3.
- Finally, calculate the Average Power using the formula above:

P = Irms^2 * R

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

P = 1100^2 * 1.3 = 1,573,000 (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:

root mean square current (amps) = 140

resistance (ohms) = 40

Entering these values into the formula or calculator above gives us::

P = 140^2 * 40 = 19,600 (watts)