The Elements of a Video Game Console

Controllers:Video controllers allow the user to input information and interact with onscreen objects.

Power supply: a power supply converts 100-240 volt AC utility power into direct current (DC) at the voltages needed by the electronics.

Console/Core Unit: The core unit in a video game console is the hub where the television, video game controllers, and game program connect. It usually contains a CPU, RAM, and an audiovisual coprocessor.

Game Media: Most video game consoles have their programs stored on external media.

Source: http://en.wikipedia.org