Power electronics question I

[youda.chen886]

The above question is a bit tricky for me, could anybody do me a favor?

 

[Ratch]

youda.chen886,

The above question is a bit tricky for me, could anybody do me a favor?

Those questions look fairly straight forward. What is "tricky" about them?

Ratch

 

[Gimlix]

It's quite simple, you use Ohm's law (V=I*R, P=I*V). The only thing you must care is you need to work with complex numbers. Put all the data into the same notation and the operate, is more a mathematics problem than electronics.

 

[youda.chen886]

It's quite simple, you use Ohm's law (V=I*R, P=I*V). The only thing you must care is you need to work with complex numbers. Put all the data into the same notation and the operate, is more a mathematics problem than electronics.

Okay~ I got it.
but what about this one?

Delta-Y connection is more complicated than you can imagine.
Give me some pointers