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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In North America 220V standard home systems are divided into two sections 110V each. For 110V requirements one side of the 220V is used along with the neutral to get 110V.
Neutral is connected to Ground at the junction box. This means that the voltage on the wiring in the house can never rise above 110V for example if there is a lightning srtike on the powerlines.
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