Question

The power factor of an a.c circuit having resistance R and inductance L Connected in series to an a.c source of angular frequency co is.

Options

• R/WL

• WL/R

• `R/sqrt(R^2 + w^2L^2)`

• zero

Answer 1

`R/sqrt(R^2 + w^2L^2)`

Explanation:

Power factor = `cos  theta = R/z = R/sqrt(R^2 + w^2L^2)`