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+//Calculate power developed and efficiency
+//Chapter 4
+//Example 4.12
+//page 308
+clear;
+clc; 
+disp("Example 4.12")
+S=0.03;                //slip
+SI=50;                //stator input in kilowatts
+SL=2;                //stator loss in kilowatts
+RI=SI-SL;            //rotor input in kilowatts
+RIL=S*RI;              //rotor I^2R loss
+//rotor core loss can be neglected at 3percent slip
+PDR=RI-RIL;            //power developed by the rotor
+printf("Power developed by the rotor=%fkW",PDR);
+FWL=1;                //friction and windage loss in kilowatt
+OP=PDR-FWL;            //output power
+printf("\nOutput power=%fkW",OP);
+effi=(OP*100)/SI;
+printf("\nEfficiency of the motor=%f percent",effi)
+
+
+