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+// Electric Machinery and Transformers
+// Irving L kosow 
+// Prentice Hall of India
+// 2nd editiom
+
+// Chapter 7: PARALLEL OPERATION
+// Example 7-2
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data
+R_a = 0.1 ; // Armature resistance in ohm
+R_f = 100 ; // Field ckt resistance in ohm
+V_L_b = 120 ; // Bus voltage in volt
+V_L_a = 140 ; // Voltage of the generator in volt
+V_f = V_L_a ; // Voltage across the field in volt
+
+// Calculations
+// case a
+I_f_a = V_f / R_f ; // Field current in A
+I_a_a = I_f_a ; // Armature current in A
+E_g_a = V_L_a + I_a_a * R_a ; // Generated EMF in volt
+P_g_a = E_g_a * I_a_a ; // Generated power in W
+
+// case b
+I_a_b = ( E_g_a - V_L_b ) / R_a ; // Armature current in A
+I_f_b = V_L_b / R_f ; // Field current in A
+I_Lg = I_a_b - I_f_b ; // Generated line current in A
+P_L = V_L_b * I_Lg ; // Power generated across the lines in W
+E_g_b = V_L_a ;
+P_g_b = E_g_b * I_a_b ; // Generated power in W
+
+// Display the results 
+disp("Example 7-2 Solution : ");
+printf(" \n a: Before it is connected to the bus ");
+printf(" \n    I_a = I_f = %.1f A \n    E_g = %.2f V\n    P_g = %.1f W \n", I_a_a,E_g_a,P_g_a);
+
+printf(" \n b: After it is connected to the bus ");
+printf(" \n    I_a = %.1f A \n    I_f = %.1f A \n    I_Lg = %.1f A \n", I_a_b, I_f_b, I_Lg );
+printf(" \n    P_L = %.f W \n    P_g = %.f W ", P_L , P_g_b );