Electrical Engineering › Section I · Sinusoidal waveforms and phasors › Topic I.8
Phasors
A phasor is a complex number that stands in for a whole sinusoid. With phasors, adding two voltages that are out of step takes a few lines of complex arithmetic instead of a page of graph paper, and the same notation runs through every ac topic that follows.
In this topic
- Adding sinusoids the long way
- The phasor as a frozen rotating vector
- The course's phasor convention
- Two warnings about phasors
- Worked example: converting both ways
- The method for adding sinusoids
- Worked example: two series voltages
- Worked example: a missing branch current
- Phasor diagrams and the elements
- Why calculus becomes algebra
- Common mistakes to avoid
- Key takeaways
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