In the three-phase half wave controlled rectifier used as a charger as shown in Fig.(Q1), the resistance is equal to 1.20 and the battery voltage is E. Transformer secondary voltage is 16 sin wt. 1. What is the maximum value of E to permits continuous charging current? 2. What is the maximum average charging current? Sketch the current waveform. 3. Find the required value of the firing angle a to obtain an average charging current of 2.5 Amp. R=3 ohm 80v