# how do you solve for power factor when KW and PF are unknown?

KVA is 351.25

I = 422

V=480

Three phase 1.732

This maybe a stupid question, but how do I solve for KW or PF without knowing either one?

### 1 Answer

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- JamesLv 68 years agoFavorite Answer
PF = Kw/ sqrt (Kw^2 + Kvar^2)

Kva = sqrt (Kw^2 + Kvar^2)

Pf = cos angle between voltage and current

In order to calculate PF you must know two of the following: Kvar ,Kw , Kva, angle between voltage and current.

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