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01
01 A COMPUTER SYSTEM
Your Aim
to learn about:
Hardware Software
How Does a Computer Work?
A computer is an electronic machine. It is made up of various devices like keyboard,
mouse, monitor and CPU. These devices help you to enter the data (input) through
keyboard or mouse, process the data using CPU and display the results (output)
on the monitor or printer.
HARDWARE
All the physical components of a computer system are called hardware. These are
the parts which we can see or touch. Hardware devices are further classified as shown:
Hardware
Input Processing Output Storage
devices device devices devices
Input Devices
A computer accepts data and instructions through input devices. Some of the
input devices are keyboard, mouse, scanner, joystick, microphone, etc.
Keyboard
A keyboard is used to enter words, numbers and
special characters.
Mouse
A mouse is a pointing device that inputs data by pointing, clicking
and dragging.
A Computer System 7

