Data: Data is raw facts and figures, in other word; raw material which is not meaningful is called data. Data is not processed it does not form meaningful information.
Example: Taj Mahal, Shahajahan, 1632.
Information: Data represented in useful form is called information. It is the raw material that is processed to form meaningful information.
Example: Taj mahal was built by shahajahan in 1632.
The data after being processed becomes information. Conversion of data into information is called data processing.
Diligence: Unlike human being, computer does not show sign of fatigue, tiredness and lack of concentration. It performs first to last calculation from millions of calculation with same speed and accuracy.
No IQ: Computer has to be told what to do, how to do and in what sequence. We do it by instructing it using programmes. It does not work without instruction.
No Feeling and emotions: Computer does not have emotions and feeling as human do.
Power of remembering: Computer can recall any amount of information stored in its memory even after several years.
Speed: Computer is very fast device. It’s speed is measured in MIPS( Million instruction per second ). A computer is capable of performing 3MIPS.
Versatility: It means computer is capable of performing any task, provided the task can be reduced to finite logical steps.
(iii) Later using the technology of Blaise Pascal, Gattfried Leibnitz in 1673 invented first calculator for multiplication and division. The multiplication was performed by repetitive addition of numbers.
(iv) Charles Babbage is called as the father of modern computer. He designed a “Difference Engine” in 1822 which could calculate various mathematical function like solving polynomial. In 1833, he designed Analytical Engine which could perform arithmetical operation (Addition, Subtraction, Division, Multiplication) and comparison.
Charles Babbage was unable to produce the making model of Analytical engine because of the unavaibility of engineering required to manufacture the machine at that time. But later it proved to be the basis of modern computer.
(v) Jacquard’s loom ( 1801 ): In order to make cotton weaving process automatic Joseph Marie Jacquard developed a programmable loom which used cards having holes punched on them.
(vi) Punch Card Machine: Herman Holterith come with the concept of punch card for speeding the collation job of American Census of 1880. Hollerith later founded Tabulating machine in 1896.
(vii) Mark I computer(1944): Mark I computers, also known as Automatic Sequence Controlled Calculator.
(viii) ENIAC Electronic Numerical Integrator And Calculator (1943-1946 ):
(ix) EDVAC Electronic Discrete Variable Automatic Computer (1946- 1952 ):
(x) EDSAC (Electronic Delay Storage Automatic Computer):
(xi) UNIVAC Universal Automatic Computer (1951):
After the success of UNIVAC I the IBM entered into in field of computer with IBM 701 computer.
CPU (Central Processing Unit)
The CPU is considered the brain of the computer. It controls all parts of the computer including data processing (like storing data, retrieving data, executing data).
It performs all tasks except the data processing acts . It obtains the instructions from the memory, intercepts it and directs the following operation. It also communicates with the input and output devices. It is regulates the transfer of data.
The Arithmetic and Logic Unit is a circuit that performs arithmetic and logical functions.
The arithmetic function involves mathematical functions like subtraction, addition, division, multiplication, etc.,
The logical function involves functions like selecting, matching, sorting, etc.,
The Input and output devices are the interface for the user and the computer to access the data from the user and provide the processed data to the user. The input devices like keyboard, mouse, joystick, barcode scanner, etc., is used to input the data into the computer. The computer processes the data and provides the data back to user through output devices like monitor, printer, graphic plotter, etc.,
The computer’s memory unit consists of RAM (Random Access Memory) and ROM (read Only Memory). The RAM first gets instructions which then passes to the processor which processes and sends back. The Random access memory is also called as Read/Write memory, which is the temporary memory of a computer. The ROM is a special memory which is read only memory, writing and erasing is not possible by user without specialized equipment. Read only memory can be manufacturer-programmed or user-programmed only.
|1. What is the importance of studying computers in Class 7?|
|2. What are the topics covered in a Class 7 computers course?|
|3. How can I improve my computer skills as a Class 7 student?|
|4. Are there any online resources available for Class 7 computer studies?|
|5. Can studying computers in Class 7 help me in my future career?|