By definition, voltage requires two points with difference in electrical potential. Usually these points are two wires or one wire and earth/ground.
But it doesn't seem to have to always be true since you can connect both sides of capacitor the same wire via diodes and charge the capacitor as in the circuit attached image (source: www.youtube.com/watch?v=ApAn0VlXXrs).
Another example would be the aftermarket cell-phone antennae that were around a decade or more ago with an LED connected to two different points of the cell phone antenna wire. During transmissions, the LED lit up (and probably ate half of the RF budget).
My question: is it possible (and how) to draw power (e.g. charge a cap) from only one pole of a low-voltage transformer secondary and leave the other pole floating?
In quirky terms, how does one borrow from the first half of the AC wave and sell it back to the second half without using a real ground?
But it doesn't seem to have to always be true since you can connect both sides of capacitor the same wire via diodes and charge the capacitor as in the circuit attached image (source: www.youtube.com/watch?v=ApAn0VlXXrs).
Another example would be the aftermarket cell-phone antennae that were around a decade or more ago with an LED connected to two different points of the cell phone antenna wire. During transmissions, the LED lit up (and probably ate half of the RF budget).
My question: is it possible (and how) to draw power (e.g. charge a cap) from only one pole of a low-voltage transformer secondary and leave the other pole floating?
In quirky terms, how does one borrow from the first half of the AC wave and sell it back to the second half without using a real ground?
