multi-part (using carbon papers). Non-Impact Printers These printers do not use striking mechanism for printing. They use electrostatic or laser technology. Quality and speed of these printers are better than Impact printers.
For example, Laser printers and Inkjet printers are non-impact printers. Laser Printers Laser printers mostly work with similar technology used by photocopiers. It makes a laser beam scan back and forth across a drum inside the printer, building up a pattern. It can produce very good quality of graphic images.
One of the chief characteristics of laser printer is their resolution – how many Dots per inch(DPI). The available resolution range around dpi. Approximately it can print pages per minute(PPM) Figure . Laser Printer Inkjet Printers: Inkjet Printers use colour cartridges which combined Magenta, Yellow and Cyan inks to create color tones.
A black cartridge is also used for monochrome output. Inkjet printers work by spraying ionised ink at a sheet of paper. The speed of Inkjet printers generaly range from - PPM (Page Per Minute). Figure .
Inkjet Printer They use the technology of firing ink by heating it so that it explodes towards the paper in bubbles or by using piezoelectricity in which tiny electric currents controlled by electronic circuits are used inside the printer to spread ink in jet speed. An Inkjet printer can spread millions of dots of ink at the paper every single second. Speakers: Speakers produce voice output (audio) . Using speaker along with speech synthesise software, the computer can provide voice output.
This has become very common in places like airlines, schools, banks, railway stations, etc. Multimedia Projectors: Multimedia projectors are used to produce computer output on a big screen. These are used to display presentations in meeting halls or in classrooms. Figure .
Multimedia Projector Figure . Speakers Chapter Page - - . Booting of computer An Operating system (OS) is a basic software that makes the computer to work. When a computer is switched on, there is no information in its RAM.At the same time, in ROM, the pre-written program called POST (Power