Network Theory Sinusoidal Steady State Analysis Power in A.C. Circuits

ఈ క్రింది సూత్రాలలో ఏది సరైనది:

1
\(KVA = \sqrt { (KW)^2 + (KVAR)^2}\)
2
KW = KVA cos ϕ
3
KVAR = KVA sin ϕ
4
All of the above

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