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+//Example 5_10 page no:200
+clc
+funcprot(0);
+function [r,th]=rect2pol(x,y)
+//rectangle to polar coordinate conversion
+r=sqrt(x^2+y^2);
+th=atan(y,x)*180/3.14;
+endfunction
+V=20//input voltage
+f=50//frequency in Hz
+R1=10//resistance in ohm
+R2=20//resistance in ohm
+L=0.1//inductance in henry
+Xl=2*%pi*f*L*%i
+Zt=R1+((R2*Xl)/(R2+Xl))
+disp(Zt,"impedance is (in ohm)")
+[mag,theta]=rect2pol(real(Zt),imag(Zt))
+disp("In polar form")
+disp(mag,"magnitude is (in ohm)")
+disp(theta,"angle is (in degree)")
+It=V/Zt
+disp(It,"the current is (in A)")
+[mag,theta]=rect2pol(real(It),imag(It))
+disp("In polar form")
+disp(mag,"magnitude is (in A)")
+disp(theta,"angle is (in degree)")
+disp(-theta,"the phase angle between current and voltage is(in degree)")