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diff --git a/380/CH4/EX4.4/Ex4_4.sce b/380/CH4/EX4.4/Ex4_4.sce
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+//Caption:Find the efficiency 
+//Exa:4.4
+clc;
+clear;
+close;
+//From Exa:4.3
+V_2=230;//in Volts
+Z_1=4+%i*12;
+I_s=75*(cosd(30)+%i*sind(30));//in Amperes
+a=10;//transformation ratio
+E_1=2282.87*(cosd(2.33)+%i*sind(2.33));//in Volts
+E_2=228.287*(cosd(2.33)+%i*sind(2.33));//in Volts
+I_p=7.5*(cosd(30)+%i*sind(30));//in Amperes
+P_o=14938.94;//in Watts
+R_c1=20000;//core loss resistance on primary side
+X_m1=15000;//magnetizing reactance on primary side
+I_c=E_1/R_c1;//in Amperes
+I_m=E_1/(%i*X_m1);//in Amperes
+I_phy=I_c+I_m;//in Amperes
+I_1=I_p+I_phy;//in Amperes
+V_1=E_1+Z_1*I_1;//in Volts
+P_in=real(V_1*conj(I_1));//in Watts
+Eff=P_o/P_in;
+disp(Eff*100,'Efficiency (%)=')
+\ No newline at end of file