Perfect Computer Notes

Uses of Computer Today, computer is used in almost every field of life. The use of computer has made different tasks very easy for us. Computer can be used at home in the many different ways. Explain different uses of computers at Home Computer has made a very vital impact on our society. People are using computers for performing different tasks quickly and easily. In fact, computer has made our life more comfortable.   Uses of Computer at Home Computer can be used at home in the following ways: 1.  Home Budget Computer can be used to manage the home budget. What are the Uses of computer at home You can easily calculate your expenses and income with the help of a software like Microsoft Excel. In MS Excel you can prepare a simple worksheet to calculate your daily expenses and income. 2. Computer Games An important use of computer at home is playing games. Different types of games are available. And if you have internet connection, then you can play games online

There are five basic operations of a computer as follows: 1. Inputting It is the process of entering data and instructions into computer system. Input is performed by input devices like keyboard, mouse, scanner, digital camera and microphone etc. 2. Storing It is the process of saving data and instructions to make them available as and when required in future. Data and programs are stored on permanent storage devices, especially on hard disk. Other permanent storage media include CD - Compact Disk, DVD - Digital Video Disk and Zip Disk etc. 3. Processing It is the process of performing arithmetic and logical operations on data to convert them into useful information. Processing is performed by CPU- Central Processing Unit. CPU is also called Processor. It is the brain of computer. 4. Outputting It is the process of producing useful information after processing data, for example, printed reports for user. Output is presented by output devices like monitor, printe

Q. Write a note on Classification of Computers    OR Explain Types of computer on the basis of Size, Shape and Resources. OR How digital computers are classified? Classification of Computers Computers are classified on the basis of size, speed and price as under: •    Microcomputer or Personal Computer •    Mini Computer •    Mainframe Computer •    Super Computer 1. Micro Computers Desktop Model computer Micro computer is also called personal computer. It was introduced in 1970. It contains  input devices, output device, storage device, memory and processor. It is used by one person at a time. Examples of personal computers are PC and Apple Macintosh. The major types of personal computers are desktop computer and portable computer. Desktop Computers These computers can easily fit on a table or desktop, hence the name. These computers come in two models or casings. In Desktop model, the system unit is placed on the desktop or table. Monitor is placed on the system unit

Following are the main basic units or components of the computer : 1. Input Unit 2. Output Unit 3. Central Processing Unit( CPU / Processor) 4. Memory Unit 5. Storage Unit Diagram Showing Main Components or Basic Units of a Computer Different Basic Units or fundamental components of a computer Brief Description of Basic components of Computer 1. Input Unit Input unit consists of input devices . Input devices are used to enter data and instructions into computer memory. Examples of input devices are Keyboard, mouse, joystick and microphone etc. 2. Output Unit Output unit consists of output devices . Output devices are used to show results produced by computer after data processing. Examples of output devices are Monitor, Printer, plotter and  speaker etc. 3. Central Processing Unit Central processing unit is also called CPU or Processor . It is the brain of the computer. It performs data processing. It controls overall operations and

Computers can be divided into the following 3 types on the basis of their working mechanism: 1) Analog Computers 2) Digital Computers 3) Hybrid Computers 1. Analog Computers Analog computer is used to measure continuous values. It measures a physical property like voltage, pressure, speed, time and temperature. An analog computer takes input in analog form and gives output in analog form. Its output is usually displayed on a meter or scale. Analog computer has low memory and fewer functions. Analog computer is mainly used in the field of engineering and medicine. Examples include: Examples of Analog Computers include:  1. Thermometer 2. Speedometer 3. Analog clock 2. Digital Computers A digital computer works with digital data. Digital computer uses binary number system. Binary number system consists of only two digits 0 and 1. A digital computer represents data in digital signals. A 0 represents OFF and a 1 represents ON. Digital computer performs arith

Following are the important characteristics of a computer : 1. Speed Computers work at a very high speed. They are much faster than humans. A computer can perform billions of calculations in a second. Computer speed is measured in Mega Hertz (MHz). 2. Storage A computer can store large amounts of data permanently . 3. Processing A computer can process the given instructions  for processing of data. It can perform different types of processing like addition, subtraction, multiplication and division. 4. Accuracy Accuracy means the capability to provide results without any errors. Computer can process large amounts of data and produce 100% accurate results. 5. Recalling A computer can recall the stored data and information at any time, as and when required. 6. Cost Reduction Computer can reduce cost. We can do a work in less time and cost by computer. A single person, with computer, can do work of many people in an office. 8. Versatile A computer can perform di