Okay, I did some googling, and found out that appliances and computers do indeed use electricity even when they are turned off! But I didn’t find anything about power bars using electricity (which doesn’t mean they don’t. If they do use electricity when turned off, it’s probably a very minute amount. Anything that is plugged into an outlet, there is some transfer of energy there, and the appliances, even when turned off, are draining power. Better thing to do is just unplug appliances, computers, synthesizers, whatever, when not in use, in order to save electricity and save money!) On the Energy Alternatives website, they refer to this energy drainage as “Phantom Loads”.