With the new update we got Autonomous activators that need power but the problem is (it's not really a problem for a player) that it never looses energy once you cut out the power. Is that intended or is it a bug? I use like 20 Autonomous activators in the exp farm and i don't complain but it's fair to say.
Yes, it depends on its task, if the activator uses power or not. But you have to give it initially some power, in eighter way though. Right-clicking computers doesnt use any power eighter.