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Confused by lecture notes (Electrical)

  • Thread starter Evales
  • Start date
  • #1
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So we're converting these currents from phasor to time domain with ω=4.

I understand I1, but not how the lecturer got I2, is this an error with the notes?

We have these phasors:
xKnOJ.png


Which are converted to this time domain (respectively):
oF3SU.png


Any help is much appreciated.
 

Answers and Replies

  • #2
gneill
Mentor
20,779
2,759
Hmm. I2 doesn't look correct to me for a couple of reasons. First, if the angle had been adjusted by adding 360°, giving -160.6 + 360 = 199.4°, then the result should show it as a positive phase angle, not negative. Second, the convention is to specify phase angles in the range +/- 180°, and 199.4° falls outside this range.
 
  • #3
NascentOxygen
Staff Emeritus
Science Advisor
9,244
1,070
Check I2. Possibly it was given as 3.254 ∠160.6°
and lecturer is converting all angles to lagging.
 

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