OUTPUT DEVICES

                                       OUTPUT DEVICES

They are those devices used to bring out information from the computer system.

It is where computer readable language is converted into human readable language. It is where already processed information is brought out from the computer system.

 Examples of output devices are: Monitor, Printer, Plotter, Speaker e t c.

                                              MONITOR

It is one of the output devices which displays all the jobs performed in the computer system. It is also called visual display unit www.facebook.com(V.D.U). It serves as our paper on which we write on and display information stored in the computer’s memory.

   The information that displays on the monitor screen is called SOFT COPY

                                        TYPES OF MONITOR

There are two types of monitor: they are:

1. MONOCHROME MONITOR

2. COLOUR MONITOR

MONOCHROME MONITOR: It is the type of monitor that displays only one colour

Note that it is always constant in nature. E.G, Black and white, Green and white, Amber and white etc

COLOUR MONITOR: It is the type of monitor that displays multiple colours.

                        TYPES OF COLOUR MONITOR

1. Enhanced Graphic Adapter (E.G.A)

2. Video Graphic Adapter (V.G.A)

3. Super Video Graphical Adapter (S.V.G.A)

 

                       SIZES OF MONITOR

 We have:

·        14 inches size monitor

·        12 inches size monitor etc

Note that we also have the Liquid Crystal Display (LCD) Monitor and the Cathode Ray Tube (CRT) Monitor.

PRINTER

The printer is one of the most important output devices. It is used to produce or print copies of documents on papers. It also produces images on permanent basis. The printout of texts, graphics on paper or any object is called HARD COPY. The speed of the printer determines how quickly the printer can print the documents. The speed is measured in characters per second or pages per minute.

TYPES OF PRINTER

There are two types of printer:

1.     THE IMPACT PRINTER

2.     THE NON-IMPACT PRINTER

IMPACT PRINTER: The impact printer uses ribbon with ink to print something like the typewriter. Inside the printer, there is print head containing small pins striker and inked ribbons. The striking action makes a dot-matrix printer quite loud. The quality of the printing depends on the number of pins in the print head. Example of impact printer is the DOT-MATRIX printer.

THE NON-IMPACT PRINTER: The non-impact printer uses ink or toners. They are unlike the impact printers that uses ribbons. They work like the photocopying machines and very fast. Examples are: the INK/DESK JETS, BUBBLE JETS AND LASER JETS. Etc

CLASSIFICATIONS OF PRINTERS

Printer can also be classified into Low speed and High speed printers.

1.     LOW SPEED PRINTERS: This is the type of printer that prints out slowly when given a command to print.

2.     HIGH SPEED PRINTER: This is the type of printer that prints out immediately when given a command to print