Electrical Engineering › Section I · Sinusoidal waveforms and phasors › Topic I.2
Phase relations
In an ac circuit the voltage across an element and the current through it usually rise and fall at the same rate but not in step. The phase relation between them, which one leads and by how much, decides how the element behaves and how much power it takes.
In this topic
- Same frequency, different timing
- Leading and lagging
- Rules for a fair comparison
- Converting to the sine form
- In phase, out of phase, and quadrature
- Phase difference as a time shift
- Worked example: which one leads?
- Worked example: a cosine and a minus sign
- Worked example: phase on an oscilloscope
- Common mistakes to avoid
- Key takeaways
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