Energy IN vs Energy OUT does not tell the whole story whenever Electrical Recycling is involved.

Electricity is not the same as force, nor the same as substance. Once spent, force - like mass - is gone. But electricity is not a force; nor is it mass - yet, it is a property of mass. Since the mass of wire is not consumed upon the use of the electrical phenomena within the wire, that electricity can be reused again and again as an oscillating phenomenon. The only caveat is the loss due to inefficiency of the wire (in this example).

No negative resistance need be invoked. No energy from the vacuum. Recycling limited resources is a sign of maturity, not a sign of depravity.