A power adapter having a freely rotatable plug connection comprises a main
body, a DC wire, and an AC wire. The main body includes a casing that
respectively encloses an adapter circuit board, a DC connector port and an
AC connector port, the DC connector port and the AC connector port being
respectively arranged on the adapter circuit board. A terminal of the DC
wire electrically connects a DC plug that mates with the DC connector port
according to a freely rotatable manner, and another terminal of the DC
wire electrically connects an output plug to deliver a signal to an
electrical device. A terminal of the AC wire electrically connects the AC
connector port and another terminal of the AC wire electrically connects
another plug.