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+//Ex 2.4 page 68
+
+clc;
+clear;
+close;
+
+// VG=0.5+8*IG -- eqn(1)
+f=400; // Hz
+delta=0.1 ; // (Duty Cycle)
+P=0.5;//W
+VS=12;// V
+
+Tp=1/f*10**6;// us
+// P= VG*IG -- eqn(2)
+// solving eqn 1 and 2
+//8*IG*IG**2+0.5*IG-P=0
+p=[8, 0.5, -P] // polynomial for IG
+IG=roots(p) ;// A
+IG=IG(2) ;// A (discarding -ve value)
+VG=0.5+8*IG;// V
+// VS=VG+IG*RS
+RS=(VS-VG)/IG
+printf('Value of resistance to be added in series = %.2f ohm',RS)