No the electrons don’t vanish, they just loose energy.
It’s basically the same way, as a river flowing from a high mountain to the sea below. You can put a water wheel in the river to draw energy from the river and do stuff. But the water wheel don’t use up any water. The amount of water flowing in and the amount flowing out is the same.
For electricity it’s the same. The electrons flow from high potential (the mountain) to a low potential (the sea) and while flowing down the give up energy, which can be used to power devices.
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