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+// chapter 2
+// example 2.8
+// Fig. E2.8
+// Calculate the resistance, gate power dissipation and maximum triggering frequency
+// page-32-33
+clear;
+clc;
+// given
+Ig_min=500; // in mA (minimum gate current)
+gradient=16; // in V/A
+Egs=15; // in V (gate source voltage)
+T_on=4; // in us (minimum turn on time)
+Pg_av=0.3; // in W (average gate power dissipation)
+// calculate
+Ig_min=Ig_min*1E-3; // changing unit from mA to A
+Vg=gradient*Ig_min; // calculation of gate voltage
+Rs=(Egs-Vg)/Ig_min; // calculation of resistance
+printf("\nThe resistance to be connected in series with SCR gate is \tRs= %.f ohm",Rs);
+Pg=Vg*Ig_min; // calculation of power dissipation
+printf("\n\nThe gate power dissipation is \t\t\t\t\tPg= %.f W",Pg);
+// Since Pg=Pg_av/(f*T_on), therefore 
+T_on=T_on*1E-6; // changing unit from us to sec
+f=Pg_av/(Pg*T_on); // calculation of maximum triggering frequency
+f=f*1E-3; // changing unit from Hz to khz
+printf("\n\nThe maximum triggering frequency is \tf= %.2f kHz \t or \tF= %.f kHz",f,f);
+\ No newline at end of file