Requirements
Requirements
Requirements
Electricity optional? Do tell?
If you have the time you could engineer a device that operates physical switches to represent bits, sort of like a curta calculator. Make it with enough bits available and engineer in an x86 compatible instruction set and hot damn you've got an electricity free computer, which (if you have the time) you can then manually set the storage bits into positions representative of your Linux filesystem with a minimal install. Figure out how you bootstrap the startup, perhaps engineer correct starting positions for the active bits (memory) such that you have an initramfs.
Can be done, technically you could do it with windows too I guess but boo close source software
Linux doesn't necessarily require an x86 (CISC) instruction set; it also runs on ARM (RISC) devices. https://www.androidauthority.com/arm-vs-x86-key-differences-explained-568718/
i've seen 2 such examples: one on solar and another using piezoelectrics along with the wind
Both of those examples use electricity.
I used to run a raspberry pi off a external phone battery via usb so i could carry it around while testing stuff lol
Electricity:
a form of energy resulting from the existence of charged particles (such as electrons or protons), either statically as an accumulation of charge or dynamically as a current.