Trace energy through solar cells, batteries, heat pumps, refrigerators, and the power grid, then see why every useful difference eventually fades.
The electrical input runs a transport cycle; it isn't the whole heat delivery
Energy crosses the network now while control layers keep the shared rhythm usable
Absorption starts the process; a junction and contacts keep carriers from simply recombining
Electrons take the outside road because ions alone can cross the inside separator
The cabinet cools only because the room receives its heat plus the compressor's work
Total energy can remain accounted for while the differences that could drive change disappear