Intro of computers
- 1. 1 MODULE 1 Introduction to Computer
- 2. 2 Lesson objectives: At the end of this lesson students should: • Define computer • Know the history of computer • Identify and understand important characteristics of computer • Identify different types of computer • Understand different applications of computers • Know components of computer system (hardware and software components)
- 3. A World of Computers What is computer literacy? is defined as the knowledge and ability to use computers and related technology efficiently, with a range of skills covering levels from elementary use to programming and advanced problem solving. 3
- 4. 5 Computer is an electronic device that can accept input data, process data, store data and produce output according to set of instructions /program. Computer Definition
- 5. Computer History… Counting aids: • The history of computers starts out about 2000 years ago in Babylonia (Mesopotamia), at the birth of the abacus, a simple calculator,a wooden rack holding two horizontal wires with beads strung on them. 5
- 6. Computer History… In 1642 French scientist and philosopher Blaise Pascal invented the first practical mechanical calculator, the Pascaline to help his tax-collector father do his sums. . 6
- 7. 7 Computer History… • In 1671, German mathematician and philosopher Gottfried Wilhelm Leibniz came up with a similar but more advanced machine. • The Leibniz machine could do much more than Pascal's: as well as adding and subtracting, it could multiply, divide, and work out square roots. • Another pioneering feature was the first memory store or "register."
- 8. 8 Computer History… Programmable calculator (Engines of calculation): Charles Babbage is considered to be the father of modern digital computers. He designed “Difference Engine” in 1822. He designed a fully automatic analytical engine in 1842 for performing basic arithmetic functions. His efforts established a number of principles that are fundamental to the design of any digital computer.
- 9. 9 Computer History… • The Z1, originally created by Germany's Konrad Zuse in his parents' living room in 1936 to 1938 and is considered to be the first electro- mechanical binary programmable (modern) computer and really the first functional computer. • In 1946 John Mauchly and J. Presper Eckert invented the world's first fully electronic, general- purpose, digital computer --Electronic Numerical Integrator And Calculator (ENIAC)
- 10. 10 Computer History… • By 1974, Intel had launched a popular microprocessor known as the 8080 and computer hobbyists were soon building home computers around it. • The first was the MITS Altair 8800, built by Ed Roberts. • From this time processor based modern computers evolved largely.
- 11. 11 Characteristics of Computer 1. Speed: The speed o f a computer in processing information is increasing from time to time and computers can calculate at very high speed. 2. Accuracy: The accuracy of a computer system is very high provided that the data and the program given to it are accurate. Error in computer data processing is mostly human factor. The program may be wrongly coded or the data may be wrongly entered.
- 12. 12 3. Storage: Computers can store large amount of data using their memory unit 4. Versatility: Computers can be programmed and applied for different purposes. People can use computers for different applications. 5. Diligence: The computer does the same thing repeatedly without saying “I am tired or I am bored”. Characteristics of computer…
- 13. 13 Limitations of Computer No I.Q: – A computer is a machine that has no intelligence to perform any task. – Each instruction has to be given to computer. – A computer cannot take any decision on its own. Dependency – It functions as per a user’s instruction, so it is fully dependent on human being Environment – The operating environment of computer should be dust free and suitable. No Feeling – Computers have no feelings or emotions. – It cannot make judgment based on feeling, taste, experience, and knowledge unlike a human being.