A power supply provides a computer with electrical power in the correct voltage and wattage that it needs.  An AC adaptor will convert Alternating Current (from a standard 120 volt socket) to Direct Current that the system components need.  Desktops typically have a built in power supply that converts AC to DC power. It often has a fan to help cool the computer so it doesn’t overheat and fail.  Notebook computers typically have an AC adapter to convert from AC to DC power, and are also used to re-charge the notebooks battery.  Handheld computers typically are powered by a battery, which can be recharged by an AC adapter.

§          A power supply provides a computer with electrical power in the correct voltage and wattage that it needs.

§          An AC adaptor will convert Alternating Current (from a standard 120 volt socket) to Direct Current that the system components need.

§          Desktops typically have a built in power supply that converts AC to DC power.  It often has a fan to help cool the computer so it doesn’t overheat and fail.

§          Notebook computers typically have an AC adapter to convert from AC to DC power, and are also used to re-charge the notebooks battery.

§          Handheld computers typically are powered by a battery, which can be recharged by an AC adapter.