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+// Electric Machinery and Transformers
+// Irving L kosow 
+// Prentice Hall of India
+// 2nd editiom
+
+// Chapter 4: DC Dynamo Torque Relations-DC Motors
+// Example 4-7
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data
+R_a = 0.25 ; // Armature resistance in ohm
+BD = 3 ; // Brush contact drop in volt
+V = 120 ; // Applied voltage in volt
+E_a = 110 ; // EMF in volt at a given load 
+E_b = 105 ; // EMF in volt due to application of extra load 
+
+// Calculations
+I_a_a = ( V - ( E_a + BD ) ) / R_a ; // Armature current for E_a
+I_a_b = ( V - ( E_b + BD ) ) / R_a ; // Armature current for E_b
+del_E = ( ( E_a - E_b ) / E_a ) * 100 ; // % change in counter EMF
+del_I = ( ( I_a_a - I_a_b ) / I_a_a ) * 100 ; // % change in armature current
+
+// Display the result
+disp("Example 4-7 Solution : ")
+printf("\n a : Ia = %d A " , I_a_a );
+printf("\n b : At increased load \n     Ia = %d A " , I_a_b );
+printf("\n c : del_Ec = %.2f percent \n     del_Ia = %.2f percent " , del_E , del_I);