introduction to computer lec (3)

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1. Lecture # 3 Primary Components 2. Input devices In computing, an input device is any peripheral (piece of computer hardware equipment) used to provide data and control signals to an information processing system such as a computer. 3. Input Devices Key board Mouse Mice Web cam Scanner Pointing devices 4. Output Devices Any peripheral that receives or displays output from computer. Flat panel Monitor Printer Projector Sound card Speakers Video card 5. Resolution Sharpness and clarity of image The higher the resolution, the better the image quality Pixel (picture element) is single point in electronic image Greater the number of pixels, the better the image quality 6. What is the resolution of a printer? Measured by number of dots per inch (dpi) printer can output 7. Types of Printer Impact Printers Nonimpact Printers 8. Impact Printers Impact printer that produces printed images when tiny wire pins strike ribbon Impact printer forms characters by striking mechanism against inked ribbon that contacts paper 9. Impact Printers Two commonly used types of impact printers: Dot-matrix Printers Line Printers 10. Nonimpact Printers Nonimpact printer sprays tiny drops of liquid ink onto paper or use heat or pressure to create image. Nonimpact printer forms characters and graphics without striking paper. 11. Types of Nonimpact Printer Ink-Jet Printers Laser Printers Thermal Printers Plotters 12. Memory and Storage Both terms are used to refer to internal storage space on a computer. Memory, usually referred to as Random Access Memory (RAM), is the place where an application loads its data during processing, while a hard disk drive is usually the place where data is stored for long or short term retention.