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+// FUNDAMENTALS OF ELECTICAL MACHINES 
+// M.A.SALAM 
+// NAROSA PUBLISHING HOUSE 
+// SECOND EDITION
+
+// Chapter 6 : CONTROL AND STARTING OF A DC MOTORS
+// Example : 6.1
+
+clc;clear; // clears the console and command history 
+
+// Given data
+V_t = 220    // supply voltage in V
+I_a1 = 10    // dc shunt motor armature current in A
+N_1 = 900    // speed in rpm
+R_a = 1      // armature resistance in ohm
+N_2 = 500    // speed in rpm
+
+// caclulations 
+E_b1 = V_t-I_a1*R_a           // initial back emf in V
+R = (E_b1/10)*(1-(N_2/N_1))   // additional value of resistance in ohm
+
+// display the result 
+disp("Example 6.1 solution");
+printf(" \n additional value of resistance \n R = %.1f ohm \n", R);
+
+