Operate Computer Hardware


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Peripherals

  • The term peripherals refers to all hardware devices that are attached to your computer and are controlled by your computer system
  • Peripherals can be classified into input devices and output devices.
  • Some can be both an input device and an output device

Input Devices

  • An input device is a piece of equipment that enables data to be entered into a computer for example:
  • Keyboard
  • Mouse
  • Joystick
  • Graphics Tablet
  • Digital Camera
  • Scanner

Keyboards

  • The keyboard is made up of push-button switches which send a signal to the CPU each time you press them.
  • Keyboard standards vary with names like Deluxe, Natural and Cordless.

Mouse

  • A roller mouse has a ball that is rolled as the mouse is moved about on the desktop.
  • Pointing and clicking allows operations to be performed without having to remember complicated keyboard commands.
  • Optical mice are superseding ball mice and use a light instead of a ball.

Digital Cameras

  • Allow us to capture images and transfer them to a computer in the form of an image file.
  • Image quality is measured in pixels.
  • Some digital cameras can capture small amounts of video.

Scanners

  • Scanners allow us to capture an image or text and convert it into digital form.
  • Optical Character Recognition (OCR) software converts the picture of the scanned text into true text that can be processed further in an application such as Word.

Output Devices

  • Output devices allow information to output from a computer.
  • Examples of output devices are:
  • Monitors
  • Printers
  • Projectors
  • Plotters

Monitors

  • The monitor or visual display unit (VDU) is the most significant output device.
  • Desktop displays use a cathode ray tube (CRT)
  • Laptops incorporate liquid crystal display (LCD)
  • Plasma

Monitors

Resolution

  • Refers to the number of individual dots of color, known as pixels, contained on a display.
  • Is expressed by the number of pixels on the horizontal axis (rows) and on the vertical axis (columns), such as 1024x768.
  • Monitors normally support resolutions matching the physical pixel grid as well as the resolution capability of your video card.

Dot Pitch

  • Is the measure of how much space there is between a display’s pixels, the smaller the dot pitch the better quality image displayed.
  • .22 mm
  • .25 mm
  • .26 mm
  • .28 mm

Refresh Rate

  • Refresh rate is the number of times that the screen image is updated per second.
  • If your monitor has a refresh rate of 75 Hertz (Hz), then it cycles through all the pixels from top to bottom 75 times per second.
  • Too few cycles per second will cause flickering which can lead to headaches and eye strain.

Color Depth

  • The combination of the display modes supported by your monitor and graphics adapter determine how many colors can be displayed.
  • Color capability is expressed as a BIT DEPTH.
  • The bit depth determines the number of colors that can be displayed at one time.

Color Depth Chart

  • Bit-depth
  • Number of colors
  • 1
  • 2
  • Monochrome
  • 2
  • 4
  • CGA
  • 4
  • 16
  • EGA
  • 8
  • 256
  • VGA
  • 16
  • 65,536
  • High color, XGA
  • 24
  • 16,777,216
  • True color, SVGA
  • 32
  • 16,777,216

Printers

Printers

  • Speed – measured in Pages Per Minute (PPM)
  • Quality – measured in Dots Per Inch (DPI)
  • The higher the DPI the better the print quality

Peripherals


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