What is in a power supply?
A power supply is an electrical device that supplies electric power to an electrical load. ... All power supplies
have a power input connection, which receives energy in the form of electric current from a source, and one or more power output connections that
deliver current to the load.
Why do we need power supply?
One purpose of a power supply is to convert AC to DC so the computer has proper power to run its components. ... Another purpose of a power
supply is to distribute proper DC voltage to each component. Several cables with connectors come out of the power supply.