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+//===========================================================================
+//chapter 1 example 9
+
+
+clc;
+clear all;
+
+//variable declaration
+s   = 4000;     //instrument sensitivity in kΩ
+R   = 10;       //range of scale
+R0  = 20;       //output resistance in kΩ
+E0  = 7.5;       //open circuit voltage 
+
+//calculations
+RL     =s*R;       //instrument resistance in kΩ
+RL1    = RL*10^-3;
+EL     = E0/(1+(R0/(RL1)));   //measured value of voltage in V
+p      = ((EL-E0)/(E0))*100;            //percentage error in %
+
+//result
+mprintf("measured value of voltage = %3.2f V",EL);
+mprintf("\npercentage error = %3.2f V  percentage low",p);
+