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Lecture # 3
Primary Components
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.
Input Devices
• Key board
• Mouse
• Mice
• Web cam
• Scanner
• Pointing devices
Output Devices
• Any peripheral that receives or displays output
from computer.
• Flat panel
• Monitor
• Printer
• Projector
• Sound card
• Speakers
• Video card
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
What is the resolution of a printer?
• Measured by number of dots per inch (dpi)
printer can output
Types of Printer
• Impact Printers
• Nonimpact Printers
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
Impact Printers
• Two commonly used types of impact printers:
• Dot-matrix Printers
• Line Printers
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.
Types of Nonimpact Printer
• Ink-Jet Printers
• Laser Printers
• Thermal Printers
• Plotters
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.

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Introduction to computer lec (3)

  • 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.