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//===========================================================================
//chapter 6 example 6
clc;clear all;
//variable declaration
Rsh = 0.02; //shunt resistance in Ω
V = 0.5; //potential difference across the shunt in V
Rm = 1000; //resistance in Ω
I1 = 10; //current in A
I2 = 75; //current in A
I = 100; //current in A
x = 40; //deflection %
//calculations
Is = V/(Rs); //current through shunt in A
Im = V/(Rm); //current through ammeter for full-scale defelction in A
V1 = I1*Rsh; //voltage across shunt for 10A in V
R1 = V1/(Im); //resistance for the ammeter for a current of 10 A for full-scale defelction in Ω
V2 = I2*Rsh; //voltage across shunt for 75A in V
R2 = V2/(Im); //resistance for the ammeter for a current of 75 A for full-scale defelction in Ω
I3 = I*(100/(x)); //full-scale defelction current when 100 A gives 40% defelction
V3 = I3*Rsh; //voltage across shunt for 250 A in V
R3 = V3/(Im); //resistance for the ammeter for a current of 250 A for full-scale defelction in Ω
//result
mprintf("current through ammeter for full-scale defelction is %3.2f mA",(Im*10^3));
mprintf("\nResistance for the ammeter for a current of 10 A for full-scale defelction is %3.2f Ω",R1);
mprintf("\nResistance for the ammeter for a current of 75 A for full-scale defelction is %3.2f Ω",R2);
mprintf("\nResistance for the ammeter for a current of 250 A for full-scale defelction is %3.2f Ω",R3);
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