# Star connected unbalanced load - help with a calculation

Discussion in 'Homework Help' started by ElecNerd, Jan 23, 2011.

1. ### ElecNerd Thread Starter New Member

Jan 2, 2011
20
0
Star connected unbalanced load - help with a calculation
Hi I am trying to calculate the phase currents in a star connected un-balanced load.

The phase voltage is 100V and the resistance in the yellow phase is 50Ω

The formula I have is...

100 ∠ -120°
50

I am struggling with how to input this into a calculator and how to get the amps in numerical value for the yellow phase.

All help greatly appreciated - ElecNerd

2. ### t_n_k AAC Fanatic!

Mar 6, 2009
5,448
784
Your formula will be correct as long as the star point is tied to the neutral conductor and the voltage phase angle is -120° for "yellow" phase convention.

As to entering the numbers using your calculator - you will need to study the user manual on how to do complex number operations.

The calculation you have doesn't really require a calculator. The answer would be 2A @ -120°.