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+// Example 4.6;all day efficiency
+clc;
+close;
+clear;
+//given
+format('v',5)
+ef=0.98;//efficiency in %
+kva=15;//kVA
+pf=1;//power factor
+op=kva*pf;//output power in kW
+ip=op/ef;//input power in kW
+loss=ip-op;//loss in kW
+cl=(loss*10^3)/2;//copper loss in W
+il=cl;//iron loss in W
+t1=12;//time in hours
+p1=2;//power in kW
+pf1=0.5;//power factor
+y1=(p1)/pf1;//kVA
+il1=il*t1;//loss in Wh
+cl1=cl*((y1)/kva)^2*t1;//copper loss in Wh
+top1=p1*t1;//kWht1=12;//time in hours
+t2=6;//time in hours
+p2=12;//power in kW
+pf2=0.8;//power factor
+y2=(p2)/pf2;//kVA
+il2=il*t2;//iron loss in Wh
+cl2=cl*((y2/kva)^2)*t2;//copper loss in Wh
+top2=p2*t2;//kWh
+t3=6;//time in hours
+il3=il*t3;//iron loss Wh
+tol=top1+top2;//iron loss kWh
+til=(il1+il2+il3)*10^-3;//total iron loss in kWh
+tcl=(cl1+cl2)*10^-3;//total copper loss in kWh
+ade=((tol)/(tol+til+tcl))*100;//efficiency in %
+disp(ade,"all day efficiency is,(%)=")