Enter the apparent power (watts) and the reactive power (watts) into the calculator to determine the Active Power.
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Active Power Formula
The following formula is used to calculate the Active Power.
Pa = SQRT ( AP^2 - RP^2)
- Where Pa is the Active Power (watts)
- AP is the apparent power (watts)
- RP is the reactive power (watts)
How to Calculate Active Power?
The following two example problems outline how to calculate the Active Power.
Example Problem #1:
- First, determine the apparent power (watts). In this example, the apparent power (watts) is measured to be 40.
- Next, determine the reactive power (watts). For this problem, the reactive power (watts) is calculated to be 20.
- Finally, calculate the Active Power using the formula above:
Pa = SQRT ( AP^2 – RP^2)
Inserting the values from above and solving the equation with the imputed values gives:
Pa = SQRT (40^2 – 20^2) = 34.64 (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:
apparent power (watts) = 70
reactive power (watts) = 20
Entering these values into the formula or calculator above gives us: Pa = SQRT ( 70^2 – 20^2) = 67.08 (watts)