4 files changed, 118 insertions, 0 deletions
diff --git a/Working_Examples/154/CH15/EX15.4/ch15_4.sce b/Working_Examples/154/CH15/EX15.4/ch15_4.sce
new file mode 100755
index 0000000..a2703a4
--- /dev/null
+++ b/Working_Examples/154/CH15/EX15.4/ch15_4.sce
@@ -0,0 +1,34 @@
+clc
+disp("Example 15.4")
+printf("\n")
+
+printf("Given")
+disp("L1=0.1H L2=0.2H")
+disp("i1=4A i2=10A")
+L1=0.1;L2=0.2
+i1=4;i2=10;
+//The energy stored in coupled coils is
+disp("W=(L1*i1^2)/2+(L2*i2^2)/2+M*i1*i2")
+
+disp("a)")
+M=0.1;
+W=(L1*i1^2)/2+(L2*i2^2)/2+M*i1*i2;
+printf("Total Energy in the coils=%3.2fJ\n",W);
+
+disp("b)")
+M=sqrt(2)/10;
+W=(L1*i1^2)/2+(L2*i2^2)/2+M*i1*i2;
+printf("Total Energy in the coils=%3.2fJ\n",W);
+
+disp("c)")
+M=-0.1;
+W=(L1*i1^2)/2+(L2*i2^2)/2+M*i1*i2;
+printf("Total Energy in the coils=%3.2fJ\n",W);
+
+disp("a)")
+M=-sqrt(2)/10;
+W=(L1*i1^2)/2+(L2*i2^2)/2+M*i1*i2;
+printf("Total Energy in the coils=%3.2fJ\n",W);
+
+
+
diff --git a/Working_Examples/154/CH15/EX15.7/ch15_7.sce b/Working_Examples/154/CH15/EX15.7/ch15_7.sce
new file mode 100755
index 0000000..86d9339
--- /dev/null
+++ b/Working_Examples/154/CH15/EX15.7/ch15_7.sce
@@ -0,0 +1,29 @@
+clc
+disp("Example 15.7")
+printf("\n")
+
+printf("Given")
+disp("N1=20 N2=N3=10")
+disp("I2=10(-53.13 deg) I3=10(-45 deg)")
+N1=20;N2=10;N3=10;
+I2mag=10;I2ph=-53.13;
+I3mag=10;I3ph=-45;
+//From figure 15.14
+disp("N1*I1-N2*I2-N3*I3=0")
+//Solving for I1
+Xmag=N2*I2mag 
+Xph=I2ph
+x=Xmag*cos((Xph*%pi)/180);
+y=Xmag*sin((Xph*%pi)/180);
+z=complex(x,y)
+
+Ymag=N3*I3mag 
+Yph=I3ph
+x1=Ymag*cos((Yph*%pi)/180);
+y1=Ymag*sin((Yph*%pi)/180);
+z1=complex(x1,y1)
+
+I1=(z+z1)/N1
+[R,Theta]=polar(I1);
+printf("I1=%3.2f(%3.2f deg) A\n",R,(Theta*180)/%pi);
+
diff --git a/Working_Examples/154/CH15/EX15.8/ch15_8.sce b/Working_Examples/154/CH15/EX15.8/ch15_8.sce
new file mode 100755
index 0000000..73b8655
--- /dev/null
+++ b/Working_Examples/154/CH15/EX15.8/ch15_8.sce
@@ -0,0 +1,22 @@
+clc
+disp("Example 15.8")
+printf("\n")
+
+printf("Given")
+disp("L1=0.2H L2=0.1H")
+disp("M=0.1H R=10ohm")
+disp("v1=142.3*sin(100*t)")
+L1=0.2;L2=0.1
+M=0.1;R=10;
+v1mag=142.3;
+w=100;
+//Let Input impedance be Z1 and can be calculated as
+//From the equations in 15.10
+disp("Z1=%i*w*L1+((M*w)^2)/(Z2+%i*w*L2)")
+Z1=%i*w*L1+((M*w)^2)/(R+%i*w*L2)
+[R,Theta]=polar(Z1)
+//If I1 is the input current
+I1mag=v1mag/R
+I1ph=-(Theta*180)/%pi
+//In time domain form
+printf("i1=%3.1f*sin(%d*t%3.1f deg) (A)",I1mag,w,I1ph);
diff --git a/Working_Examples/154/CH15/EX15.9/ch15_9.sce b/Working_Examples/154/CH15/EX15.9/ch15_9.sce
new file mode 100755
index 0000000..0d9f2fa
--- /dev/null
+++ b/Working_Examples/154/CH15/EX15.9/ch15_9.sce
@@ -0,0 +1,33 @@
+clc
+disp("Example 15.9")
+printf("\n")
+
+s=%s;
+printf("Given")
+disp("L1=0.2H L2=0.1H")
+disp("M=0.1H R=10ohm")
+disp("v1=u(t) a unit step function")
+L1=0.2;L2=0.1
+M=0.1;R=10;
+v1=1;
+w=100;
+//Let Input impedance be Z1 and can be calculated as
+//From the equations in 15.10
+disp("Z1(s)=L1*s-((M*s)^2)/(R+L2*s)")
+Z1=L1*s-(((M*s)^2)/(R+L2*s))
+//Proper rearranging of co-efficients
+Num=Z1('num')/0.01
+Den=Z1('den')*100
+
+disp(Num/Den,"Z1(s)")
+Y1=1/Z1
+disp(Den/Num,"Y1(s)")
+
+//As the input is unit step function the value is 1V for t>0
+//In exponential form the value is represented as exp(s*t) with s=0 as the pole of Y1(s)
+
+//Therefore forced response
+k=1/L1;
+printf("Forced response i1,f=(%d*t) (A)\n",k);
+
+