initial commit / add all books

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+//Ex 4.7 page 161
+
+clc;
+clear;
+close;
+
+
+R=3;// ohm
+wL=4;//ohm
+Vs=230;// V
+f=50;// Hz
+
+fi=atan(wL/R)*180/%pi;//degree
+printf('\n (i) control range of firing angle = %.2f to pi',fi)
+Imax=Vs/sqrt(R**2+wL**2);// A
+printf('\n (ii) max rms load current = %.f A', Imax)
+Pmax=Imax**2*R;//W
+printf('\n (iii) max power input to load = %.f W', Pmax)
+pf_max=Pmax/Vs/Imax;// power factor
+printf('\n (iv) max power factor = %.1f ', pf_max)
+Ithrms=Imax/sqrt(2);// A
+Ithav=Ithrms/1.57;// A
+printf('\n (v) max rms thyristor current = %.3f A', Ithrms)
+printf('\n     max average thyristor current = %.3f A', Ithav)