I saw a 18W wall wart which could supply 5V 3A or 9V 2A or 12V 1.5A. It had only one USB output and no way to select output voltage.
How does a thing like that work? I know that devices draw varying amounts of current, but can they draw(?) specific voltages also? How does the device tell the wall wart what voltage to supply?
Hope my question is clear.
Thanks.
How does a thing like that work? I know that devices draw varying amounts of current, but can they draw(?) specific voltages also? How does the device tell the wall wart what voltage to supply?
Hope my question is clear.
Thanks.