What Are Input And Output Devices?

Input and output equipment allow people to communicate with computers. An input device converts data and programs that humans can understand into a form the computer can process. Such a device translate the letters, numbers, and other natural language symbols that humans conventionally use in reading and writing into the configuration of 0 and 1 bits that the computer process. Output devices on the other hand, convert strings of computer bits back into natural-language form to make them understandable to humans. These devices present output on screen displays, on paper or film, and in other forms. Much of a computer system's peripheral equipment performs input or output functions.

Keyboards pointing devices, and optical character recognition devices are designed primarily for input. Printers and monitors specialize in output. Output devices produce results in either hard-copy or soft-copy form. The term hard copy generally refers to output permanently recorded onto an easily portable medium such a paper or film. Printed reports and output put into slide or transparency form are common examples. The term soft copy generally refers to display output that appears temporarily in a form with limited portability, such as on a computer screen.

Computer system is the combination of the input and output devices, Input devices capture the data from the external environment and processor process the data and provide the information of the output devices. Many kinds of input and output devices are available. Input devices are keyboard, mouse, scanner, joystick etc.

The mouse was invented in 1964 by Douglas Engle Bart, who at the time was working at the Stanford Research Institute (SRI), a think tank sponsored by Stanford University. The mouse was officially called an X-Y Position Indicator for a Display System.
As video standards improved, making games more realistic, input devices made especially for game play also became more and more popular. The first joysticks made for the IBM PC were similar to joysticks made for its early rival, the Apple II series.
One of the most basic system components is the keyboard, which is the primary input device. It is used for entering commands and data into the system.

Output devices are provides the information, after processing the data. Much kind of output devices are available such as Monitor, Speaker, printers. Along with the mouse and keyboard, the video display is a vital part of the user interface of any computer. Actually, it is a latecomer to computing; before CRT monitors came into general use, the teletypewriter was the standard computer interface—a large, loud device that printed the input and output characters on a roll of paper.

If The Input Voltage Is 2volts What Would The Output Voltage Be If R1=100 Ohms And R2=200 Ohms