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​Heating & Should electric

Certain sources of electricity most notably, rotary electro-mechanical generators naturally produce voltages alternating in polarity, reversing positive and negative over time. Direct vs alternating current. Whereas the familiar battery symbol is used as a generic symbol for any DC voltage source, the circle with the wavy line inside is the generic symbol for any AC voltage source. One might wonder why anyone would bother with such a thing as AC. It is true that in some cases AC holds no practical advantage over DC.

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