Electrical Engineering › Section I · Sinusoidal waveforms and phasors › Topic I.1
Sinusoidal waveforms and their general format
The voltage at a wall outlet does not sit at one value: it swings smoothly up and down sixty times a second. This topic gives you the vocabulary and the single equation used to describe that swing, and every ac topic after it builds on them.
In this topic
- From steady dc to alternating ac
- Words that describe a waveform
- Frequency and the hertz
- Worked example: reading an oscilloscope trace
- The sine wave and the rotating vector
- Angular frequency
- The general format
- Polarity and direction
- Worked example: instantaneous values
- Why sinusoids matter
- Common mistakes to avoid
- Key takeaways
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