initial commit / add all books

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+//CHAPTER 7- SINGLE PHASE TRANSFORMER
+//Example 31
+
+disp("CHAPTER 7");
+disp("EXAMPLE 31");
+
+//single phase transformer having 400 primary and 1000 secondary turns
+//VARIABLE INITIALIZATION 
+N1=400;
+N2=1000;
+coreA=60;                                //net core area in cm^2
+v1=500;                                  //primary voltage in Volts 
+f=50;                                    //frequency
+
+//
+//SOLUTION  
+//v1=E1=4.44.Φm.N1.f Volts
+phiM=v1/(4.44*N1*f);
+//flux density Bm=Φm/area
+Bm=phiM/coreA;                          //lines per cm
+//voltage per turn
+vpt=v1/N1;
+v2=N2*vpt;
+//
+disp(sprintf("The maximum flux density is %.3fx10^-5 Wb per cm^2",Bm*10^5));//text book anser is 9383 lines per cm^2
+disp(sprintf("The secondary voltage is %.0f V",v2));
+disp(" "); 
+// 
+//END