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diff --git a/503/CH3/EX3.17/ch3_17.sci b/503/CH3/EX3.17/ch3_17.sci
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+// To determine the rating and full load efficiency of autotransformer
+
+clc;
+//when used as transformer
+v1=240;
+v2=120;
+r=12000;
+I1=r/v1;
+I2=r/v2;
+
+//when connected as autotransformer
+V1=240;
+V2=v1+v2;
+rr=I2*V2;            disp(rr,'rating of autotransformer(va)');
+
+pf=1;
+P_o=r*pf;            //output power
+n=.962            //efficiency at upf
+P_L=P_o*(1-n)/n;
+
+pff=.85            //if pf=.85
+Po=rr*pff;
+nn=1/(1+P_L/Po);        disp(nn*100,'efficiency(%) at .85 pf is');
+\ No newline at end of file