What is computer?
Computer is an electronic machine that
takes raw data from user as input form operation on it under the set of
instruction and gives result to user.
DATA: Unorganized record, raw fact or figure.
INSTRUCTION: Command that tells
computer what to do and how to do.
PROCESS: Sequence of action to do work.
INPUT: Enter data into the
computer by the user through input device.
OUTPUT: Display result either on computer screen or on the paper (through printer) .
Charles babbage is known as father of computer.
Classification of Computer : Computer is classified on the basis of application, on the basis of size, on the basis of purpose as given below.
Analog
Computer: - These
type of computer is used to measure physical quantities like pressure,
temperature length height etc & represent the result in digits.
Example: -
Thermometer, speedometer.
Digital
Computer: - These
type of computer works on binary number and used to calculate numbers. Digital computer
converts all input value in 0 and 1 form and then operation on it.
Example: -
Desktop, Laptop, Mobile.
Hybrid
Computer: - This is
combination of both Analog computer and digital computer.
On the
basis of size
Micro
Computer: - These
type of computer small in size. Micro computer is single user computer system
and its cost is also low.
Example: -
PC, Laptop.
Mini Computer:
- These type of
computer is large in comparison to micro computer. In minicomputer 250 users
can work at the same time. Its working capacity is greater than micro computer.
Mainframe
Computer: -
Mainframe computer is large in size and expensive. In mainframe hundreds or
thousands user can work at the same time. Big company uses these computers like
server.
Super
computer: - Super
computer is fastest and very expensive computer. That is used for research,
weather forecasting and animated graphics.
· First super computer is Cray 1.
· First Indian super computer is PARAM
8000.
· PARAM SHIVAY is latest Indian super
computer.
