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+//control systems by Nagoor Kani A
+//Edition 3
+//Year of publication 2015
+//Scilab version 6.0.0
+//operating systems windows 10
+// Example 2.1
+clc;
+clear;
+n=300;// number of turns
+li=0.01//linearity =1%
+v=30//voltage=30V
+kp=v/n
+disp(kp,'potentiometer constant in (volts/turn)')
+nmid=n/2
+vmid=kp*nmid
+disp(vmid,'voltage at mid point is;')
+disp('range of voltage at mid point with 1% linearoty is 14.7volts to 15.3 volts')//vmid(+-)0.3
+//assuming potentiometer is perfectly linear so the resistance at midpoint setting from reference is 50kohm
+//load resistance of 500Kohm  is connected in parallel with potentiometer
+req=(500*50)/(500+50)
+v0=(v*req)/(50+req)//using voltage divison rule
+disp(v0,'voltage at midpoint with load resistance 500Kohm (in volts)')
+