Everybody's knowledge breaks down if you dig deep enough. You can for example ask how to produce the metal for the wiring of that power supply and from which mi

Everybody's knowledge breaks down if you dig deep enough. You can for example ask how to produce the metal for the wiring of that power supply and from which minerals and ores. You don't need to know this since this isn't computer science and other people provide the materials for you. So the issue boils down to two questions. A philosophical one and a practical one. Does understanding of the power supply belong to computer science or to some other discipline, like electrical engineering? Do you need to swap your power supply on your own or can you rely on other people offering this as a service? Apple's move to prevent users from replacing batteries in iPhones offers an interesting perspective here.