The video addresses one of the most overlooked questions in EE; Why do we use complex numbers for analysing AC circuits? The video explains one of the most revolutionary techniques in circuit analysis that enables us to deal with sinusoids effortlessly.

Course on AC Analysis: https://www.coursera.org/learn/linear... (Not Sponsored)
MIT 6.002 Circuits and Electronics:    • Lec 1 | MIT 6.002 Circuits and Electr...   (Specifically Lectures 16 and 17 covers these topics in much more detail)

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Animations were coded with a python library:
https://github.com/3b1b/manim
Created by Grant Sanderson:
https://www.3blue1brown.com/
   / @3blue1brown