The power factor of an AC circuit having resistance R and inductance L connected in series to an AC source of angular frequency ω is

Options

(a) zero
(b) ωL/R
(c) R/√R²+ω²L²
(d) R/ωL

Correct Answer:

R/√R²+ω²L²

Explanation:

power factor, cos ɸ = R / Z = R / √[R² +ω²L²]