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+//Example 2_7
+clc;
+clear;close;
+
+//Given data: 
+P=10;//kW
+Idc=50;//A
+SF=2;//safety factor
+
+//Solution :
+Vdc=P*1000/Idc;//V
+alfa=0;//degree
+Vm=Vdc*%pi/(2*cosd(alfa))+1.7;//V
+PIV=2*Vm;//V
+Vthy=SF*PIV;//V
+disp(Vthy,"(a) Voltage rating of thristor in V");
+PIV=Vm;//V//for bridge rectifier
+Vthy=SF*PIV;//V
+disp(Vthy,"(b) Voltage rating of thristor in V");
+///Answer in the book is wrong.