Question

What is Different Cases?

Answer

Different Cases - Case I : When AC circuit contains ohmic resistance. In this case, ɸ = 0. ∴ cosɸ = 1 ⇒ Pev = Vrms × Irms = Vrms = Vrms × Vrms/R = V2rms/R, Case II : When AC circuit contains only capacitor. In this case, ɸ = -π/2 ∴ cosɸ = cos(-π/2) = 0 ⇒ Pav = 0 Case III : When AC circuit contains only inductance. In this case, ɸ = π/2 ⇒ cosɸ = cosπ/2 = 0 Case IV : When AC circuit contains resistance and capacitance both. Pav = V2rms R/(R2 + 1/⍵2 C2) Case V : When AC circuit contains resistance and inductance both. Pav = V2rms R/(R2 + ⍵L2) Case VI : When AC circuit contains inductance, capacitance and resistance. Pav = V2rmsR/R2 + (⍵L - 1/⍵C)2
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