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+//===========================================================================
+//chapter 1 example 10
+
+clc;
+clear all;
+
+//variable declaration
+E0 = 50; //internal voltage source in V
+R0 = 100; //resitance in kΩ
+r = 99; //accuracy in %
+
+//calculations
+//Em = E0/(1+(R0/RL))
+//Em = E0*(r in %)
+//E0/(1+(R0/RL)) = E0*(r in %)
+Em = (E0*r)/(100);
+x =E0/(Em);
+y = x-1;
+Rm = R0/(y); //resistance of voltage in kΩ
+
+//result
+mprintf("resistance of voltage = %3.2f kΩ",Rm);
+