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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 4-12
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data
+V_a = 120 ; // Rated terminal voltage of dc shunt notor in volt
+R_a = 0.2 ; // Armature resistance in ohm
+BD = 2 ; // Brush drop in volt
+I_a = 75 ; // Full load armature current in A
+
+// Calculations
+I_st = ( V_a - BD ) / R_a ; // Current @ the instant of starting in A
+percentage = I_st / I_a * 100 ; // Percentage at full load
+
+// Display the results 
+disp(" Example 4-12 Solution : ");
+printf(" \n Ist = %d A ( Back EMF is zero )",I_st );
+printf(" \n Percentage at full load = %d percent ", percentage );