3 phase Delta / Star : Line or Phase?

[Cocoleia]

Homework Statement

I am studying for an exam and I never know if I am finding line current / voltage or phase current / voltage. How can I tell? I guess I am confused on what "phase" and "line" represent. For example:

If I do the voltage divided by the impedance, then this gives me phase current, but how do I know?

Does it differ for star and delta configurations? If this example would have been in star would I still have found the phase current by doing that division ?

 

[cnh1995]

If I do the voltage divided by the impedance, then this gives me phase current,

And for star, it is equal to line current. For delta, phase current is equal to 1/√3 times the line current.