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diff --git a/3775/CH4/EX4.2/Ex4_2.sce b/3775/CH4/EX4.2/Ex4_2.sce
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+++ b/3775/CH4/EX4.2/Ex4_2.sce
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+//Ex 4.2 page 158
+
+clc;
+clear;
+close;
+
+
+R=10;// ohm
+Vs=230;// V
+f=50;// Hz
+nc=18;// conducting cycles
+noff=32;// off cycles
+
+k=nc/(nc+noff);// duty ratio
+Vor=Vs*sqrt(k);// V
+Po=Vor**2/R;// W
+Pi=Po;// W (losses are negligble)
+Ior=Vor/R;//A
+pf=Po/Vs/Ior;//W
+Im=Vs*sqrt(2)/R;//A
+Irms=Im*sqrt(k)/2;//A
+Iav=k*Im/%pi;//A
+printf('\n (a) rms output voltage = %.0f V', Vor)
+printf('\n (b) Power output to load = %.1f W', Po)
+printf('\n (c) Power input to regulator = %.1f W', Pi)
+printf('\n (d) input power factor = %.1f ',pf)
+printf('\n (e) average scr current = %.3f A', Iav)
+printf('\n     rms scr current = %.3f A', Irms)