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+// Example 2.12 :Circuit constants
+clc;
+close;
+format('v',6)
+clear;
+// given :
+//v=194*cos(800*t+150)V Voltage equation
+//I=11.6*cos(800*t+140)A Current equation
+vm=194/sqrt(2);//voltage in volts
+va=150;//angle in degree
+im=11.6/sqrt(2);//current in amperes
+ia=140;//angle in degree
+zm=vm/im;//resistance in ohms
+za=va-ia;//resistance in ohms
+z1=zm*cosd(za);//reactance in ohms
+z2=zm*sind(za);//reactance in ohms
+z=z1+%i*z2;//resistance in ohms
+disp("part (a)")
+disp(z,"Impedance is ,(Ohm)=")
+disp("part (b)")
+//v=6*sin(1000*t+45)V  Voltage equation
+//I=12*cos(1000t-90)A current equation
+vm1=60/sqrt(2);//voltage in volts
+va1=45;//angle in degree
+im1=12/sqrt(2);//current in amperes
+ia1=0;//angle in degree
+zm1=vm1/im1;//resistance in ohms
+za1=va1-ia1;//resistance in ohms
+z11=zm1*cosd(za1);//reactance in ohms
+z21=zm1*sind(za1);//reactance in ohms
+z22=z11+%i*z21;//impedance in ohms
+disp(z22,"Impedance is ,(Ohm)=")