The problem does not state whether the source is a delta or a wye. But you actually don't need to know! The 220V provided is the line (also know as the "line-to-line") voltage. So you can work from there to determine what is happening in the load.
The phase voltage is related to the line voltage: magnitude is SQRT(3) smaller and angle is 30 degrees less.
Once you have the phase voltage (magnitude and angle) then you can use Ohm's law (the current is given in the problem statement) to compute the impedance.
© Steven H. VanderLeest, 2008
This page was written and is maintained by Steve VanderLeest.
It was last modified on 21-Apr-2008 .