No seriously, I always get blank stares when I ask people, I’ve called them wall chargers or power bricks, my friend called them plug chargers, my fiancee calls them dongles. What do you call these around your house, like when you’re asking someone if they’ve seen any (______)'s
Power Adapter is too broad.
If someone asked me for one I wouldn’t know what they wanted. It could be an international adapter, or a DC power supply, or one of these things.