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Question:

Compare and contrast the following
(i) Impact printers and non-impact
printers
(ii) Analog monitor and digital monitor

Answer:

Impact Printers:

  • Mechanism: Use a striking mechanism (like a typewriter) to physically hit an inked ribbon onto paper.
  • Noise: Generally noisy due to the impact of the striking mechanism.
  • Print Quality: Can produce carbon copies and are suitable for multipart forms.
  • Examples: Dot matrix printers are a common type of impact printer.

Non-Impact Printers:

  • Mechanism: Use technologies like inkjet (spraying ink) or laser (applying toner via electrostatic process) to create characters on paper without physically striking it.
  • Noise: Quieter compared to impact printers.
  • Print Quality: Typically higher resolution and better for graphics.
  • Examples: Inkjet printers, laser printers, thermal printers.

Main Differences:

  • Printing Technology: Impact printers physically strike the paper to produce an image, while non-impact printers use other methods like spraying ink or applying toner.
  • Noise Level: Impact printers are noisier due to their physical striking mechanism, whereas non-impact printers are quieter.
  • Print Quality: Non-impact printers generally offer higher resolution and better quality output compared to impact printers.

Monitors:

Analog Monitors:

  • Signal Type: Receive analog signals, which are continuous waveforms.
  • Resolution: Lower resolution compared to digital monitors.
  • Usage: Commonly used with older devices or in legacy systems.
  • Example: CRT (Cathode Ray Tube) monitors were analog.

Digital Monitors:

  • Signal Type: Receive digital signals, which are discrete values (usually binary).
  • Resolution: Higher resolution and better clarity.
  • Usage: Standard in modern computing and multimedia devices.
  • Example: LCD (Liquid Crystal Display), LED (Light Emitting Diode) monitors.

Main Differences:

  • Display Technology: Analog monitors interpret continuous analog signals, whereas digital monitors process discrete digital signals.
  • Resolution: Digital monitors typically offer higher resolution and better clarity compared to analog monitors.
  • Usage: Digital monitors are standard in modern technology due to their compatibility with digital devices and superior image quality.