A typical computer takes some energy "from the wall" while operating. I know that energy is spent on:
- Heating various components (psu/vrm/cpu/ram/ssd, so on)
- Fan/air motion to remove that heat (also vibrations, absorbed by case and surroundings)
- Magnetic emission from various chokes and long +5/+12v wires.
Let's consider that PC is disconnected from the network and has no attached devices and wires other than power cord. So that electric energy has no other ways out/wires to go. Then, all those waste-factors (mentioned above) are parasitic, in the sense that we want typically to avoid/lower them.
But the computer also does some meaningful process called calculation. For example, calculating a list of a prime numbers, or splitting very big number to prime factors - that is not an easy tasks - and that cannot just be done "instantly".
So the question is: is there some other kind of "compute" energy (other than mentioned above)? Does the energy go somewhere else, other than mentioned above?
Or would I get exactly what we took out of the wall? (If we sum up heat + motion + emi waste, mentioned above).
I can even reword it: if we consider some theoretical recuperation device that would absorb every wasted watt of heat, emi and vibration from working PC (with 100% efficiency), and convert it back to electricity (also with 100% efficiency), would calculation run forever "for free"? Or is there some other energy leak spot?