# Homework Help: A question about a three-phase circuit

1. Apr 23, 2012

### Shloa4

Attached.
I'll be happy for some help here.
Thanks.
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

#### Attached Files:

• ###### Question.pdf
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2. Apr 24, 2012

### Staff: Mentor

So am I. You have added I₁ + I₂ without regard for their different angles.

3. Apr 24, 2012

### Shloa4

oops.. :) but still, S1 and V1 are similar in phase, aren't they? And since that's the case, S/V yields magnitude only (on the real axis). Same for both loads. And since the phase becomes 0 for both I1 and I2 (which is wrong obviously, but I cannot figure out where exactly I miss a thing here) so I can add I2 to I1.
That's probably my problem here. Any idea?

4. Apr 24, 2012

### Staff: Mentor

What does "similar in phase" mean exactly http://img820.imageshack.us/img820/9631/icon5j.gif [Broken]

The details are that one load has a leading pf and the other a lagging pf.

Last edited by a moderator: May 5, 2017