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// To find the inductance of a choke to operate a 120V 500W lamp at 230V
clc;
clear;
V=120;
W=500;
Rl=(V^2)/W;
I=W/V; // Circuit Current
// Q of a choke means the ratio of its inductive reactance to its resistance
Q=2;
f=60;
w=2*%pi*f;
Vs=230; // Supply Voltage
Xcir=230/I;
L=poly([0 1],'L','c');
Xl=w*L;
Rc=Xl/2; // Q utilised
// total resistance
Rt=Rl+Rc;
ind=(Rt^2)+(Xl^2)-(Xcir^2);// Characteristic equation to find L
L=roots(ind);
disp(ind,'The Characteristic equation to find L is')
if(imag(sqrt(L(1))))
L=L(2);
else
L=L(1);
end
disp('H',L,'The inductance of the choke coil = ')
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