The power adaptor (ปลั๊ก แปลง ไฟ, which is the term in Thai) also known as a power supply or an AC adaptor plugs into a standard electrical outlet and converts the AC current from the wall socket to the specifications required by device that is been plugged in. The AC adaptor is a box attached to the power cord, either at the end of the cable where the device plugs into the socket or in the middle of the power cord.
Several devices such as cell phones, laptops, cordless phones, video game systems, compact disc players, and so on rely on AC adaptors for their power supply.
AC adaptors are yet to be designed to be universal to all electronic devices.
How a Power Adaptor Works
Power Adaptor converts currents from the electrical outlet to a lower AC that a device been plugged in can use.
The first windings that wrap an iron core inside the AC adaptor receives the 120-volt AC delivered to the outlet, creating an electric field in the iron core. The next wire winding changes the newly created electric field to a smaller AC. The measure of the resulting alternating current depends on the number of coils in the other wire winding concerning the number in the initial winding. If the other winding is half of the initial winding, the Ac will measure half of what it did when it entered the alternating current adaptor.
Converting AC to DC
For electronics that function on battery power, but can be plugged into an electrical socket, alternating current adaptors are used to convert AC into DC. Behind the two wire windings and the iron core are two rubber wrapped diodes that convert AC into DC by letting them to flow in a single direction.