but, I am using power socket, sound like I have planned and made arrangement already for future sense. If you use present progressive to ask question, it is ok, but if you use it to say "I am using the power socket." it sounds a bit strange to me.
Did you have a question about this?
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.