These are the volume control, the on off switch and the channel changer, which lives under the couch. So output is the flow of information to you and input is the flow from you to the device. By work I mean heavy duty arithmetic or searching through long lists for a certain item. So now, the parts of the computer. The computers main job is to run programs.
Programs are instructions in a language that computers and programmers understand.
Then, when you want to run that program, you type its name and the computer goes and gets the program off the hard drive, or wherever it is stored, and brings it into its short term storage, called RAM, and runs the program. We'll look at this in more detail later.