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+//===========================================================================

+//chapter 10 example 24

+

+clc;

+clear all;

+

+//variable declaration

+V = 3;  //battery voltage in volts

+Rm = 2;  //meter resistance in  Ω

+Ifm = 10;  //full scale deflection meter current in mA

+Rh = 0.5;  //half scale deflection resistance in  Ω

+

+//calculations

+Im = 0.5*Ifm;             //half-scale deflection of the movement

+Vm = Im*Rm;                //voltage across movement in mV

+Ix = (Vm*10^-3)/Rh;           //current through resistor in A

+Ix1  = Ix*10^3;               //urrent through resistor in mA

+IB = Im+Ix1;               //total battery current in mA

+V1 = V-(Vm*10^-3);            //voltage drop across current lo V

+Rse = V1/(IB*10^-3);           //current limiting resistor in Ω

+

+//result

+mprintf("current limiting resistor = %3.1f Ω",Rse);