Input
Devices
Output Devices
Printers
Input Devices: allows data to be entered into the computer.
| Keyboard | Web-Cam | Mouse | Joystick | Scanner |
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Output Devices: present data to a computer user.
| Printer | Speakers | Monitor |
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Printers: There are 2 types of Printers: Impact and Non-impact printers.
| Type of Printer | How it Works | Example |
| Impact | Strikes the Page | Dot-Matrix |
| Non-Impact | Sprays Ink on to the page Uses heat to transfer images |
Ink-Jet / Bubble Jet Laser |
Dot-Matrix Printers: are very noisy, cheap, produce low quality print, not used that often nowadays.
Ink-Jet / Bubble Jet Printers: are not as expensive as Laser printers, they can be noisy, they are slower than Laser Printers and don't give as good a quality print.
Laser Printers: are very fast, very expensive, very quiet, give excellent print results but are very expensive.
The Resolution of printers is measured in DPI (Dots per Inch) 
To see how an ink-jet printer works click here How Stuff Works
Copyright © Catherine O'Sullivan, 2001