Power Electronics And Rotating Electric Drives – Introduction – Power Electronics – The Thyristor – Rotating Electric Drives – The Direct Current Drive – The Alternating Current Drive – Choice Of Drive And Control System – References And Bibliography – The Thyristor – Introduction – Semiconductors – The Diode – The Transistor – Cutoff – Linear Region – Saturation – The Thyristor – The Diode Model Of The Thyristor – The Two Transistor Model Of The Thyristor – Thyristor Characteristics – The Thyristor Reverse Biased – The Thyristor Forward Biased And Blocking – The Thyristor Forward Biased And Conducting – Light Tum On – Gate Tum On – Breakover Voltage Turn On – Thyristor Turn Off – Ways Of Turnoff – Natural Commutation – Reverse Bias Turnoff – Gate Turnoff – Thyristor Turnoff Time – Thyristor Ratings – Voltage Ratings – Current Rating – Power Rating – Load Current Forward Conduction Loss – Forward Leakage Power Loss – Reverse Leakage Power Loss And Turnoff Loss – Gate Power Loss .