There is a long held belief with some electricians that turning on an electric device requires a "startup" cost, or an overhead in the amount of power needed for it to start functioning normally. I have known people who make sure to only turn devices on or off when they feel they really must because they want to avoid this cost. Is this a misunderstanding of how a capacitor works or a real phenomenon?
Edit: By electric device I mean anything that uses electricity. A good example to answer my question would be a lightbulb since you don't have to think about a complex system. Does it take some extra amount of electricity to get the lightbulb lit, or is it simply on when the circuit is closed and off when the circuit is open?