initial commit / add all books

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diff --git a/3041/CH8/EX8.8/Ex8_8.sce b/3041/CH8/EX8.8/Ex8_8.sce
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+//Variable declaration
+Vs=200                //dc source voltage(V)
+Il=5                  //current to load voltage(A)
+Vl=15                 //load voltage(V)
+eta=.85               //efficiency
+f=20                  //oscillator frequency(Hz)
+iSmax=2.6             //peak value of supply current(A)
+P=100                 //full load power supply(W)
+pdf=0.4               //pulse duty factor
+
+//Calculations
+Isav=(Vl*Il)/(Vs*eta)   //average peak supply current(A)
+iS=(2*Isav)/pdf         //supply current(A)
+T=1000/f                //oscillation time period(uS)
+tp=pdf*T                //transistor time(us)
+d=iS/tp                 //change in iS with respect to time(A/us)
+tp1=iSmax/d             //transistor time(us)
+pdf1=tp1/T              //pulse duty factor
+Isav1=(iSmax*pdf1)/2    //average peak supply current(A)
+eta1=(P*100)/(Vs*Isav1) //efficiency
+
+//Results
+printf ("peak value of supply current is %.3f A",Isav)
+printf ("pdf is %.3f ",pdf)
+printf ("overall efficienc is %.1f %%",eta1)