I was about to ask a question if we should even have the computer tag at all.
Computers is a very broad term.
Also 3 of the 14 questions that have been tagged with it have been closed.
I don't mean to start a discussion here about if the question should be opened or closed. I am focusing more on if the tag is good or not.
I think @reemrevnivek hit the nail on the head in a comment:
The single [computers] tag is probably not the right thing for this question, and makes it look off-topic. Any device which is plugged into AC power and has a power rating like an AC motor, light, or heater/air conditioner would have a very similar question. A PC just has the issues of the switching power supply and varying load requirements to differentiate it. I'd add the [power], [power-supply], and [power-meter] tags to the question (but only if we want to reopen it).