# RL circuit with both Vs and Is out of phase.

Discussion in 'Homework Help' started by Tera-Scale, Jan 1, 2011.

1. ### Tera-Scale Thread Starter Active Member

Jan 1, 2011
164
5
Hi,
I ve been trying to workout an RL problem where Vs of 100$\angle30$ and Is of 2$\angle-10$ is applied to 2 impedances; Z1 = 25Ω and Z2 = R2+jXL. Can i convert the Vs to 100$\angle40$ and Is to 2$\angle0$ and work with them like that to find R2 and L ?

2. ### t_n_k AAC Fanatic!

Mar 6, 2009
5,448
783
Yes - If it helps you solve the problem then shifting the source voltage phase angle and source current phase angle by the same value would be acceptable.

3. ### shteii01 AAC Fanatic!

Feb 19, 2010
3,558
517
Another technique is to convert polar coordinates into rectangular. This way:
Vs=86.6+50j
Is=1.969-0.347j
Z1=25+0j=25
Z2=R2+jXL