The point I was making before with home theater and smartphones is that there is going to be some distinction drawn somewhere between general electronics knowledge and specific PC knowledge. Nowadays, nearly every electronic item has a processor, including smartphones and home theater setups (especially if they involve HTPCs, which can be multicore, of course), and increasingly they are being networked with desktops.
You could say that knowledge of printers is a key part of computer/PC training, but it's not part of the core system (i.e. the components that make up the tower and the software/OS that runs on the computer). In an office IT environment knowledge of printers is essential, of course, but not always in other enviroments. In any case, that wasn't really my main point, which is that the user clearly does have an "above average" knowledge of computers even though he doesn't know about laser printer power usage. I'm willing to bet many people - including a lot on this forum - don't know a lot about UPSes and printers. I certaintly don't.
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