Advanced Physics The circuit of Fig.3.23 consists of identical resistors R,= Ry =200 $2, an ideal diode D and an ideal thyristor 7 supplied from an ideal power supply V. = 200 sinoot. (a) Sketch, to scale, corresponding waveforms of the supply voltage and the currents in Ry, Ry. D and T if the thyristor firing angle is 90. (b) What is the average value of the current in Ry for a supply cycle? Fig. 3.23. V V, sin ot