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- 2. Computers are madeof the following basic components: 1.Case with hardware inside: 1. Power Supply -The power supply comes with the case, but this component is mentioned separately since there are various types of power supplies.The one you should get depends on the requirements of your system.This will be discussed in more detail later 2. Motherboard -This is where the core components of your computer reside which are listed below. Also the support cards for video, sound, networking and more are mounted into this board. 1. Microprocessor -This is the brain of your computer. It performs commands and instructions and controls the operation of the computer. 2. Memory -The RAM in your system is mounted on the motherboard.This is memory that must be powered on to retain its contents. 3. Drive controllers -The drive controllers control the interface of your system to your hard drives.The controllers let your hard drives work by controlling their operation. On most systems, they are included on the motherboard, however you may add additional controllers for faster or other types of drives.
- 3. 4. Hard diskdrive(s) -This is where your files are permanently stored on your computer. Also, normally, your operating system is installed here. 5.CD-ROM drive(s) -This is normally a read only drive where files are permanently stored.There are now read/write CD-ROM drives that use special software to allow users to read from and write to these drives. 6.Floppy drive(s) - A floppy is a small disk storage device that today typically has about 1.4 Megabytes of memory capacity. Other possible file storage devices include DVD devices, Tape backup devices, and some others. 3.Monitor -This device which operates like aTV set lets the user see how the computer is responding to their commands. 4.Keyboard -This is where the user enters text commands into the computer. 5.Mouse - A point and click interface for entering commands which works well in graphical environments.
- 4. Sr.No. Operation Description 1Take Input The process of entering data and instructions into the computer system 2 Store Data Saving data and instructions so that they are available for processing as and when required. 3 Processing Data Performing arithmetic, and logical operations on data in order to convert them into useful information. 4 Output Information The process of producing useful information or results for the user, such as a printed report or visual display. 5 Control the workflow Directs the manner and sequence in which all of the above operations are performed. All types of computers follow a same basic logical structure and perform the following five basic operations for converting raw input data into information useful to their users.
- 6. Input Unit This unitcontains devices with the help of which we enter data into computer.This unit makes link between user and computer.The input devices translate the information into the form understandable by computer. CPU (Central Processing Unit) CPU is considered as the brain of the computer. CPU performs all types of data processing operations. It stores data, intermediate results and instructions(program). It controls the operation of all parts of computer. CPU itself has following three components ALU(Arithmetic Logic Unit) Memory Unit Control Unit Output Unit Output unit consists of devices with the help of which we get the information from computer.This unit is a link between computer and users. Output devices translate the computer's output into the form understandable by users.
- 7. CPU consistsof the following features: CPU is considered as the brain of the computer. CPU performs all types of data processing operations. It stores data, intermediate results and instructions(program). It controls the operation of all parts of computer. CPU itself has following three components. Memory or Storage Unit Control Unit ALU(Arithmetic Logic Unit)
- 8. Following are fewof the important input devices which are used in a computer: Keyboard Mouse Joy Stick Light pen Track Ball Scanner GraphicTablet Microphone Magnetic Ink Card Reader(MICR) Optical Character Reader(OCR) Bar Code Reader Optical Mark Reader(OMR)
- 9. Following are fewof the important output devices which are used in a computer. Monitors Graphic Plotter Printer
- 10. Monitors, commonlycalled asVisual Display Unit (VDU), are the main output device of a computer. It forms images from tiny dots, called pixels that are arranged in a rectangular form. The sharpness of the image depends upon the number of pixels. There are two kinds of viewing screen used for monitors. Cathode-RayTube (CRT) Flat- Panel Display Back
- 11. The CRTdisplay is made up of small picture elements called pixels.The smaller the pixels, the better the image clarity, or resolution. It takes more than one illuminated pixel to form whole character, such as the letter ‘e’ in the word help. A finite number of characters can be displayed on a screen at once.The screen can be divided into a series of character boxes - fixed location on the screen where a standard character can be placed. Most screens are capable of displaying 80 characters of data horizontally and 25 lines vertically.There are some disadvantages of CRT: Large in Size High power consumption Back
- 12. The flat-paneldisplay refers to a class of video devices that have reduced volume, weight and power requirement in comparison to the CRT.You can hang them on walls or wear them on your wrists. Current uses of flat-panel displays include calculators, video games, monitors, laptop computer, graphics display. The flat-panel display is divided into two categories: Emissive Displays - The emissive displays are devices that convert electrical energy into light. Example are plasma panel and LED(Light-Emitting Diodes). Non-Emissive Displays - The Non-emissive displays use optical effects to convert sunlight or light from some other source into graphics patterns. Example is LCD(Liquid- Crystal Device) Back
- 13. A plotteris a computer hardware device much like a printer that is used for printing vector graphics. Instead of toner, plotters use a pen, pencil, marker, or another writing tool to draw multiple, continuous lines onto paper rather than a series of dots like a traditional printer.Though once widely used for computer-aided design, these devices have more or less been phased out by wide-format printers. Plotters are used to produce a hard copy of schematics and other similar applications. Advantages of plotters Plotters can work on very large sheets of paper while maintaining high resolution. They can print on a wide variety of flat materials including plywood, aluminium, sheet steel, cardboard, and plastic. Plotters allow the same pattern to be drawn thousands of times without any image degradation. Disadvantages of plotters Plotters are quite large when compared to a traditional printer. Plotters are also much more expensive than a traditional printer. Back
- 14. Printer isan output device, which is used to print information on paper. There are two types of printers: Impact Printers Non-Impact Printers Back
- 15. The impactprinters print the characters by striking them on the ribbon which is then pressed on the paper. Characteristics of Impact Printers are the following: Very low consumable costs Very noisy Useful for bulk printing due to low cost There is physical contact with the paper to produce an image These printers are of two types Character printers Line printers Back
- 16. Character printersare the printers which print one character at a time. These are further divided into two types: Dot Matrix Printer(DMP) DaisyWheel Back
- 17. In themarket one of the most popular printers is Dot Matrix Printer.These printers are popular because of their ease of printing and economical price. Each character printed is in form of pattern of dots and head consists of a Matrix of Pins of size (5*7, 7*9, 9*7 or 9*9) which come out to form a character that is why it is called Dot Matrix Printer. Advantages Inexpensive Widely Used Other language characters can be printed Disadvantages Slow Speed Poor Quality Back
- 18. Head islying on a wheel and pins corresponding to characters are like petals of Daisy (flower name) that is why it is called Daisy Wheel Printer.These printers are generally used for word-processing in offices which require a few letters to be sent here and there with very nice quality. Advantages More reliable than DMP Better quality The fonts of character can be easily changed Disadvantages Slower than DMP Noisy More expensive than DMP Back
- 19. Line printersare the printers which print one line at a time. These are of further two types Drum Printer Chain Printer Back
- 20. This printeris like a drum in shape so it is called drum printer.The surface of drum is divided into number of tracks.Total tracks are equal to size of paper i.e. for a paper width of 132 characters, drum will have 132 tracks. A character set is embossed on track.The different character sets available in the market are 48 character set, 64 and 96 characters set. One rotation of drum prints one line. Drum printers are fast in speed and can print 300 to 2000 lines per minute. Advantages Very high speed Disadvantages Very expensive Characters fonts cannot be changed Back
- 21. In thisprinter, chain of character sets are used so it is calledChain Printer. A standard character set may have 48, 64, or 96 characters. Advantages Character fonts can easily be changed. Different languages can be used with the same printer. Disadvantages Noisy Back
- 22. Non-impact printersprint the characters without using ribbon.These printers print a complete page at a time so they are also called as Page Printers. These printers are of two types Laser Printers Inkjet Printers Characteristics of Non-impact Printers Faster than impact printers. They are not noisy. High quality. Support many fonts and different character size. Back
- 23. These arenon-impact page printers.They use laser lights to produce the dots needed to form the characters to be printed on a page. ADVANTAGES Very high speed Very high quality output Give good graphics quality Support many fonts and different character size DISADVANTAGES Expensive. Cannot be used to produce multiple copies of a document in a single printing. Back
- 24. Inkjet printersare non-impact character printers based on a relatively new technology.They print characters by spraying small drops of ink onto paper. Inkjet printers produce high quality output with presentable features. They make less noise because no hammering is done and these have many styles of printing modes available. Colour printing is also possible. Some models of Inkjet printers can produce multiple copies of printing also. ADVANTAGES High quality printing More reliable DISADVANTAGES Expensive as cost per page is high Slow as compared to laser printer Back