Consider the basic commutation circuit below with Id = 10 A. UL Lig D1 + D2 d Id = = (a) With V, 120 V at 60 Hz and Ls 0, calculate Va and the average power Pd,. (b) With Vs = 120 V at 60 Hz and Ls = 5 mH, calculate u, Va and Pd. (c) Here vs has a 60-Hz square waveform with an amplitude of 200 V, L=5mH. Plot the is waveform and calculate u, Va and Pa. and (d) Repeat part (c) if vs has the pulse waveform shown in Fig. below 200 V 0 wt -60°-1 120°. 160° 120° 60°1 (f= 60 Hz) -(200 V)