[Superman]

Those little cubes we use to charge things have specs. Some say they are 5V. They all seem to say something different. I have imagined that I need to match the charging cube to the device being charged.

But yesterday I received a Bluetooth dongle that has a "0.5V" charging port. This dongle did not come with a charging cube. All of my charging cubes have WAY higher voltages than this. Hmmmm......

In news that may be related, the cube that came with my Mac lists four output voltages and amperages separated by the word "or". 20V/1.5A or 15V/2.0A or 9V/3.0A or 5V/3.0A.

Here is what I wonder: Do devices draw whatever their voltage and current needs are, regardless of what the cube is capable of providing. This would make sense for current, but I don't see how devices could change voltages. If I connect the 0.5V Bluetooth dongle to a 5.0V cube, will the 0.5V dongle be happy?