computer ppt.pptx

Hardware devices
Parts of computer
Computer parts presentation
Keyboard mouse printer scanner joystick ppt
Computer ppt
Software devices ppt
Scanner
Plotter
Types of printer
Types of mouse
Types of scanner
Types of plotter
Difference between software and hardware devices
Function of keyboard keys
Function of joystick
Function of stylus
Monitor
Function of monitor
Difference between impact and non impact printer
Features of monitor

1. Computer A computer is a machine or device that performs processes calculations operations based on instructions provided by a software or hardware program It has the ability to accept data (input), process it, and then produce outputs.

2. Keyboard It is a text base input device that allows the user to input alphabets, numbers and other characters. It consists of a set of keys mounted on a board. Alphanumeric keys: It consists of keys for English alphabets, 0 to 9 numbers, and special characters like + − / * () etc. Function keys: There are twelve function keys labeled as F1, F2, F3, F4 …F12. The functions assigned to these keys differ from one software package to other. These keys are also user programmable keys.

3. Numeric keypad: Numeric keypad is located on the right side of the keyboard It consists of keys having numbers (0 to 9) and mathematical operators (+ − * /) defined on them. This keypad is provided to support quick entry for numeric data. Cursor movement keys: These are arrow keys and are used to move the cursor in the direction indicated by the arrow (up, down, left, right).

4. KEYS Functions Enter Used to return key and execute a command or program Spacebar It is used to enter a space Backspace It is used to move the cursor one position to left and also delete the character Delete Used to delete the character like alphabet,table and picture Insert Used to toggle between insert and overwrite mode during data entry Cntrl Used in conjunction with other keys to provide additional functional keyboard Alt It is like control key, used in combination with other keys to perform specific task

5. Mouse mouse is the most popular device used pointing input device. Structure The front of mouse casing contains one wheel and 2 or 3 buttons. The bottom of a mouse is flat and contains a mechanism that detect the movement of mouse. Example An object on the screen is selected by clicking the left button of the mouse. A program or folder is open by double clicking the left button of the mouse. Function It is used to control the cursor or pointer on the screen and to give commands to the computer. A mouse also allows the user to create graphics such as lines, curves and freehand shapes.

6. Types of mouse Mechnical Mouse Optical Mouse Wireless or cordless Mouse Air Mouse Touch Mouse

7. Joystick The joystick is a vertical handheld lever mounted on a base. Structure The lever include two or more buttons. These buttons are called triggers. A button is used to activate an event or action. Function The lever can be moved in different directions to control the movement of the object on the screen. It is basically used to play video games. It is also used in computer –aided design system.

8. Scanner Scanner can capture data directly from the source documents and store inside the computer in digital form. The source documents may include price pr inventory tags, paychecks, brochures, order forms, answer sheets, and photos. Types of scanner Optical scanner Flatbed scanner Handheld scanner Sheetfed scanner Drum scanner

9. Pen input devices: Pen input devices looks like pens. These devices are used in some computing devices for giving input. The users touches a Pen input device on a touch screen to write or draw or make selections. Stylus: Stylus is a small input device that looks like a ballpoint pen. It is made of metal or plastic. They are used in many other mobile devices. Digital pen: It is similar to a Stylus but is highly large than Stylus. It also provides more functionality than Stylus. A digital pen is called pen.

10. Types of scanner: Flatbed scanner: A Flatbed scanner is also known as image scanner. It scans a full image of the document at a time. It works like photocopy machine. Handheld scanner: A Handheld scanner is called a pen scanner. It is a small Handheld scanning device. It works in a same way as we use marker highlighter. Sheet-fed scanner: A type of scanner that scans only a piece of paper at a time. It can scans photos ,letters forms ,businesses cards.

11. Output devices: The data processed into a useful form is called output. The users can view the output on screen or print into on the paper through a printer or store it in the disk into the file . Classification: Softcopy output: The output viewed on the display screen is called softcopy output. The output in the form of audio video is known as softcopy output. The kind of type is not tangible. Hard copy Output: The output printed on the paper is hardcopy print. It may be in the form of text and graphics. The commonly are printers and plotters.

12. Monitors: A Monitor is a commonly used output device on personal computers. It display device or simply display. It is used as softcopy output devices. Features: 1.The size of monitor is measured in inches. 2.The display screens can be either color or monochrome. The color display screen shows different colours. 3.The resolution refers to sharpness and clearness of image 4.The distance between pixels on the monitor screen is called dot pitch. It is measured in millimetres.

13. Printers: Printers are the most commonly used output devices. They are used to print documents on the papers. The output printed on the paper is called Hardcopy. The Hardcopy is also called a printout. The outputs may be in the forms of characters, symbols and graphics. The printout resolution is measured in dots per inch. Types of printers: Impact Printer 2. Non-Impact Printer

14. Difference between impact and non-impact printer Parameter Impact Printer Non-Impact Printer Definition Impact printers create pictures and figures by hitting a device such as a wheel or a print hammer against an inked ribbon. Non-impact printers create figures and pictures without any connection between the printing device and the paper. Mechanism In impact printers, printing is executed by hammering a character dye or metal pin. In non-impact printers, printing is executed by dropping ink on paper in any manner. Speed Of Printers Impact printers are low in terms of speed. Non-impact printers are comparatively fast in speed. Technology They utilize traditional printing technologies. They utilize contemporary printing technologies Value They are pretty affordable. They are quite expensive as compared to impact printers.

15. Plotter Plotter is 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 on paper rather than multiple dots, like a traditional printer. Types: Flatbed Plotter Flatbed plotter is a computerized plotter that works using an arm that moves a pen over paper Drum plotter The plotter was the first output device to print graphics and large engineering drawings.

16. Speaker Computer Speaker is an output hardware device that connects with a computer to generate a sound. It converts electrical energy into mechanical energy. The signal is used to produce sound and comes from a computer speaker. It is made from the sound card of the computer. IBM built the first internal computer in 1981, which did not have good sound quality

17. Headphones Sometimes called earphones, headphones are a hardware output device that connect to a computer line out or speakers port or wirelessly with Bluetooth. Headphones allow you to listen to audio or watch a movie without disturbing people around you. Headphones originally consisted of one speaker for each ear, connected by a band over the head.