railway RRB JE (CBT I + CBT II) Mock Test 2024 Network Theory Sinusoidal Steady State Analysis Power in A.C. Circuits

निम्नलिखित में से कौन-सा सूत्र सही है?

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