I understand the concept of DC, but if electrons are just kind of moving back and forth in one place to produce an electric charge for AC, why do they say it’s necessary to have a path back to ground/ 0V if it’s not “moving” towards ground/ 0V?
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Path to and from the source. The source is grounded. The electrons alternate direction but they still move back and forth in the wire. The earth (ground) is a bad wire choice so 2 conductors are used is my understanding.
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