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+//CHAPTER 8- DIRECT CURRENT MACHINES
+//Example 33
+
+disp("CHAPTER 8");
+disp("EXAMPLE 33");
+
+//VARIABLE INITIALIZATION
+v_t=230;                       //in Volts
+N1=1500;                       //in rpm
+I_a1=20;                       //in Amperes
+r_a=0.3;                       //armature resistance in Ohms
+r_se=0.2;                      //series field resistance in Ohms
+
+//SOLUTION
+
+//solution (a)
+E_b=0;                         //at starting
+nr1=v_t-I_a1*(r_a+r_se);       //value of numerator
+r_ext=nr1/I_a1;
+disp(sprintf("(a) At starting, the resistance that must be added is %f Ω",r_ext));
+
+//solution (b)
+I_a2=I_a1;
+N2=1000;
+ratio=N2/N1;
+nr2=v_t-I_a2*(r_a+r_se);
+r_ext=((ratio*nr1)-nr2)/(-I_a2);
+disp(sprintf("(b) At 1000 rpm, the resistance that must be added is %f Ω",r_ext));
+
+//END