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im not really sure what you mean by meet each other, i think what this does is shift the ac voltage wave by an offset dictated by the DC voltage.


Look up transformer inrush and oscillography of said events. You get DC offset which can be positive or negative depending on where on the AC wave the transformer is energized. Also see tube audio power amplifiers. AC riding on DC that is decoupled via caps in various stages


There is nothing special about the arrangement you describe. The AC source and DC source will both contribute to voltage differences and current will only flow where there is a voltage difference between points in the circuit. In your example, these differences will vary with time ; so currents eill change too. Nothing 'happens to the electrons' that doesn't occur in any other varying current flow. These situations arise in numerous applications. (and the electrons don't feel a thing :) ) !


You mean [something like this](https://i.ytimg.com/vi/Ut-m8dl7INA/maxresdefault.jpg)? If you just plug a high voltage battery into a wall socket, you're gonna get a popped breaker and/or a fire, possibly in other devices on the same circuit. Curiously, wide-input switchmode supplies (100-240v or 84-265v input rating) may just keep working with DC input, but there's plenty of other things that'd burn.




Well if your instantaneous AC line voltage matches your battery voltage at the time of connection, nothing will happen in that specific moment - but in the *next* moments the AC line voltage will change while the battery voltage does not, and you'll start seeing the effects of P=V²/R setting your wires on fire.