Electrons travel through the conductors (wires) from one end to the other, pushed by the potential difference (voltage) of a DC power source (e.g. battery). Most electronic devices function on DC current. What does the 'box' on power adaptors do?
1) Converts AC current from the wall outlet to DC current for the electronic device
2) Converts DC current from the electronic device to AC current for the wall outlet
3) Converts DC current from the wall outlet to AC current for the electronic device
4) Converts AC current from the electronic device to DC current for the wall outlet