INTRODUCTION ABOUT

COMPUTER SYSTEMS

GRADE

LESSON

System

Digestive system

Bicycle

System

• System is set of element/component working together to achieve a common goal

01. a set of things working together as parts of a
mechanism or an interconnecting network; a complex
whole.
"the state railway system"

02. a set of principles or procedures according to which
something is done; an organized scheme or method.
"the public school system"

Input
Output

Process

Interact

Thermostat

Thermostat

device to detect temperature changes for the purpose of maintaining the temperature of an enclosed area essentially constant. In a system including relays, valves, switches, etc., the thermostat generates signals, usually electrical, when the temperature exceeds or falls below the desired value.

IS HUMAN BRAIN A SYSTEM?

X

y

Memory

+

+

instructions

----------
------------
----------
-------------

=

Data And Information

Data

• The numbers, words, images, sounds and

symbols which do not bear a meaning, when
standing alone are called data.

Examples

Name, Age, Marks, Height, Photograph, NIC No,
Country, Price, Salary

Data

Information

Processing

Quantitative data

Qualitative data

Information

• Data can be arranged and processed to

make meaningful result which is called as an Information.

Examples

Total Marks, Average Marks, List of Names in
Ascending order, Net Salary, Maximum No, Price
List

Data And Information

67,89, 90

Total=246

Total =67+89+90

Rani
Sitha
Anoja
Sapumali

Anoja
Rani
Sapumali
Sitha

Arrange in

Ascending order

Quantitative data is numbers-based, countable, or
measurable.
Quantitative data tells us how many, how much, or
how often in calculations.

​Qualitative data is interpretation-based, descriptive,
and relating to language. behind certain behaviors.
Qualitative data can help us to understand why, how, or
what happened

​Quantitative data

​Qualitative data

COMPUTER

පරිගණකය
(Computer)

Data

Input

Process

Output

Information

Instruction

IS HUMAN BRAIN A SYSTEM?

X

y

Memory

+

+

instructions

----------
------------
----------
-------------

=

ID

OD

Storage

CPU

Instruction

Instruction

Data

Data

Information

Computer
දත්ත (Data)

උපෙදස් (Instruction)

ෙතාරතුරැ
(Information)

Process

Input

Output

DEFINITION OF THE COMPUTER

• COMPUTER IS AN ELECTRONIC DEVICE THAT INPUT DATA PROCESS AND OUTPUT REQUIRED

INFORMATION.

• SPEED OF THE COMPUTER IS THE MAIN ADVANTAGE OF THE COMPUTER SYSTEM WITH COMPARED

TO OTHER SYSTEM

COMPUTER DEFINITION

“COMPUTER IS AN ELECTRONIC SYSTEM THAT INPUT DATA BY HUMAN OR ANOTHER SYSTEM

THEN PROCESS AND STORE THAT DATA ACCORDING TO THE INSTRUCTION GIVEN AND OUTPUT
REQUIRED INFORMATION “

“A COMPUTER CAN BE DESCRIBED AS AN ELECTRONIC DEVICE, WHICH ACCEPTS OR COLLECTS
DATA, PROCESSES THEM ACCORDING TO THE GIVEN INSTRUCTIONS AND PRODUCES THE
DESIRED OUTPUT.”

AN ELECTRONIC DEVICE FOR STORING AND PROCESSING DATA, TYPICALLY IN BINARY FORM,

ACCORDING TO INSTRUCTIONS GIVEN TO IT IN A VARIABLE PROGRAM.

A PROGRAMMABLE ELECTRONIC DEVICE DESIGNED TO ACCEPT DATA, PERFORM PRESCRIBED

MATHEMATICAL AND LOGICAL OPERATIONS AT HIGH SPEED, AND DISPLAY THE RESULTS OF
THESE OPERATIONS.

PROGRAMMABLE CALCULATORS

1

3

2

5

12

11

10

9

8

7

6

4

14
15

16

13