Question

The power factor of an AC circuit having resistance (R) and inductance (L) connected in series and an angular velocity ω is

(a) R/ωL 

(b) R/(R² + ω²L²)^1/2

(c) ωL/R 

(d) R/(R² – ω²L²)^{1/2 .}

Answer 1

(b) : Power factor = R/√(R² + L²ω²).