Harmonic, displacement and input power factor

[0U2H4N]

1. A single phase half controlled bridge rectifier operated from a120V 60Hz ac supply. The load
current with an average value of I is continuous and negligible ripple content. If the delay angle
of thyristors is 60, calculate,
i) The harmonic factor of the input current
ii) The displacement factor
iii) The input power factor



PF = I_s1/I_s2*cosψ



What is ψ? i think that ψ=arctan(wL/R), if so what are L and R?

 

[0U2H4N]

i need to solution in haste