Every computer part has a reason and a purpose, so when u build or modify a computer or PC be careful and read other instructions and information about installation.
Components such as: A C.P.U., cooling units /fans, hard drives, card slots, disk slots, mother boards, LCD displays and many more!
As computers got better and better, more units where designed for them, and now computers have many components.
And so, computers are basically machines that compute data hence the name COMPUTEr.
Computers make life easier and safer, but taking things too far will lead to problems.
Anyway, old computer graphs show a unit that has a input, control, storage, processer, and output.
Tubes are still used in some sound systems, the costumers say it has deeper and richer sound.
Computers used tubes, instead of transistors! Tubes are about 4 inches tall, to almost a foot tall!!! Transistors are smaller, so tubes went out of business.
Old computers use relays, but modern receivers and sound units use relays too!