Intuitive Understanding of Sine Waves – BetterExplained
https://betterexplained.com/articles/intuitive-understanding-of-sine-waves/
You: Geometry is about shapes, lines, and so on. Alien: Oh? Can you show me a line? You (looking around): Uh... see that brick, there? A line is one edge of that brick. Alien: So lines are part of a shape? You: Sort of. Yes, most shapes have lines in them. But a line is a basic concept on its own: a beam of light, a route on a ... 
AC Waveforms | Basic AC Theory | Electronics Textbook
https://www.allaboutcircuits.com › ... › Basic AC Theory
When an alternator produces AC voltage, the voltage switches polarity over time, but does so in a very particular manner. When graphed over time, the “wave” traced by this voltage of alternating polarity from an alternator takes on a distinct shape, known as a sine wave: Figure below ... 
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