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diff --git a/431/CH2/EX2.21/EX2_21.sce b/431/CH2/EX2.21/EX2_21.sce
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+//Calculate the fully-load speed of the motor
+//Chapter 2
+//Example 2.21
+//page 126
+clear;
+clc;
+disp("Example 2.21")
+P=4;..................//pole
+V=500;................//shunt motor  in volts
+Ia=60;......................//armature current in amperes
+Ra=0.2;..........................//armature resistance in ohms
+E=V-(Ia*Ra)-2;
+printf("voltage drop across each brush=%fV",E)
+phi=0.03;.................................//flux per pole in Wb
+Z=720;.....................................//total armature current in volts
+A=2;
+N=(E*60*A)/(phi*Z*P)
+printf("\nfull load speed of the motor=%frpm",N)
+\ No newline at end of file