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+//Example 6.6
+//Program to calculate the external power efficiency of the device 
+
+clear;
+clc ;
+close ;
+
+//Given data
+eeta_t=0.18;          //*100 percent - TOTAL EFFICIENCY
+Eg=1.43;              //eV - ENERGY BAND GAP OF GaAs
+V=2.5;                //Volts - APPLIED VOLTAGE
+
+//External power efficiency of the device
+eeta_ep=eeta_t*Eg/V;
+
+//Displaying the Result in Command Window
+printf("\n\n\t External power efficiency of GaAs device is %1.0f percent.",eeta_ep*100);
+\ No newline at end of file