A 200 watt power source consumes only the total watts that the items plugged into it use, right? I'm asking because I am ready to purchase a device discussed here for the Menards buildings and I don't want to overload my circuit in my train room. Or does it consume the 200 watts just by turning it on, regardless of the items you are running?
This answers the questions on other transformers, too. Forgive my forgetfulness but it's been awhile since I asked myself this question.