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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You don’t need a path towards ground necessarily, you just need the two ends to be at different voltages. It’s just easier to alternate the voltage on one end and keep the other end constant than to alternate both ends.
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