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Computer Fundamentals
Chapter -
About Computer:
The word “Computer “comes from the Latin word " compute " which means to
calculate. Most of the people usually think it is an arithmetic calculating device
but now a days many of the works done by computers which are non-
arithmetic.
COMPUTER stands for Common Operating Machine Purposely Used for
Technological and Educational Research.
Charles Babbage is the father of modern digital computer.
Definition of a Computer:
A computer is an electronic device that operates under the control of a set of instructions that is stored in its memory unit.
A computer is a collection of hardware and software components that help you complete many different tasks.
A computer can be more accurately defined as an electronic device that takes data as input, stores and processes it and displays the output according to the given instructions.
Data processing Concept
I-P-O Cycle
CPU
The cycle of activities performed by a computer is referred to as the Input- Process-Output cycle or the I-P-O cycle A computer consists of several components. Each component participates in either one of the input, process, or Output phases
Data – A computer usually accepts input in the form of data. Data is the raw material for information. Data refers to numerical (1,2,3,4,5,6,7,8,9,0), alphabetical (A,B,C,D ……Z) and special characters (e.g., @,#,$,%,^,&,!). A set of numbers could be examples of data. OR
Data is a word of Latin used to describe a collection of natural phenomena like numbers, characters, images or symbols, in a very broad sense.
Information – Information is the finished product (manipulation of raw facts). Information refers to data in particular context, which helps us understand facts. Example- +91(011) 2555-1212 is a telephone no. of a directory. It includes country code 91, an area code 011, a telephone exchange 2555 and a number within the exchange 1212.
A computer is a digital system that store and processes data in the form of binary digits i.e. 0s & 1s. Computer use both decimal & binary systems. Decimal system uses 10 as a base to represent different values, representing digits (0-9). In binary system uses 2 as a base to represent different values, representing digits (0 and 1). 0 and 1 known as bits. A bit is a smallest unit of information that is use in computer system.
Characteristics of computer
Computers of all sizes have common characteristics:–
Speed Reliability Multitasking Diligence Accuracy Memory capacity
Speed
It works in very high speeds and can much faster than human. It equivalent to one million mathematicians working 24 hours in a day. Reliability
Computers are extremely reliable as well. Most errors are caused by humans, not computers. Computers are capable of storing enormous amounts of data that must be located and retrieved very quickly.
EXERCISES
Long Question :
- What is a Computer? List & explain some important characteristics of a computer.
- Draw a block diagram to illustrate the basic organization of a computer system and explain the function of the various units.
- What is a Computer? Briefly explain the functionality wise classification of computer.
- What do the terms “data”, “information” and “data processing” mean?
Short Question:
a) CPU stands for?
b) _________ Computer process millions of instructions per second.
c) The brain of a computer system is ___________. (Ans. CPU)
d) _________ Computer process trillions of instructions per second.
e) Computer divided in to how many units?
f) Central Processing Unit divided in to how many units?
g) Who is the father of modern digital Computer?
h) Single user can interact with Micro Computer at a time. (True / False)
i) Multiple users can interact with Mini Computer at a time. (True / False)
j) _______ is a smallest unit of information that is use in computer system.
