1. The problem statement, all variables and given/known data a) Use Y-Δ transformation to simplify the circuit in Figure 2-a to that in Figure 2-b and find the elements and values of Z1, Z2 and Z3 b) Use mesh analysis for the circuit in Fig. 2-b to calculate I1 and I2 Here are the circuits. http://i1233.photobucket.com/albums/ff390/wklols/c1.png 2. Relevant equations 3. The attempt at a solution a) I'm not sure what to do to be honest. Do I convert the delta to wye form? So each 'branch' be equal to (-39j)(-39j)/(-39j-39j-39j)= -12j? So now would I have the three branches with -12j and 12j+9Ω= 9Ω ? b) -240+(4+z2)(i2-i1)+(4+z3)i2=0 -240+(4+z3)(i1)-(4+z3)(i2-i1)=0 And that's about all I can do.