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IPO Cycle
A Computer takes the data as input, processes and then gives result as an output.
Input Process Output
3, 6, + 3 + 6 9
Data Information
Input devices Processing device Output devices
IPO Cycle
INPUT DEVICES
A computer accepts data and instructions from you through input devices. Data can
be in the form of numbers, text, sound or graphics. Some of the input devices are:
Keyboard
A computer keyboard is the main
input device for computers. You can
press the keys on it to input data in
the form of words and numbers.
A standard keyboard has 104 keys,
which can be classified as follows:
Alphanumeric keys (A–Z, a–z, 0–9)
Control keys (Ctrl, Alt, Esc, etc.) Keyboard
Function keys (F1–F12)
Special keys (Caps Lock, Backspace, Spacebar, Arrow keys, Home, End, etc.)
Punctuation keys (“ , ” , “-”, ; , etc.)
Mouse
It is a pointing device that allows you to put data into a
computer by using the point, click and drag and drop
commands. It controls the movement of the pointer on the
screen. It is used to move and select icons, files and folders
on your computer. It can also be used to draw pictures. Mouse
Fundamentals of a Computer 9

