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01 A COMPUTER
SYSTEM
Your Aim
to learn about:
l Hardware l Software
l How Does a Computer Work?
A computer is an electronic machine. It is made up of various devices like keyboard,
mouse, monitor and CPU. You can 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 that 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

