Peripheral Device
There are three types of peripheral devices :• Input devices • Output devices • Storage devices Input DevicesInput devices are any electronic device that are connected to a computer and produces input signals. Output DevicesOutput is the result of data processing activity when it is presented externally to the system. The output from a computer can be printed or displayed form . An output device is hardware that is capable of delivering or showing information to one or more users. An output device shows, prints and presents the results of a computer's work. Storage DevicesInformation and documents are stored in a computer storage so that it can be retrieved whenever they are needed later on. Computer storage is the holding of data in an electromagnetic form for access by a computer processor. Different types and the functions of peripheral1. Printers A printer is another example of an output device that can be used to print text and graphics on mediums such as paper, transparency film or even cloths. A photo printer is a colour printer that produces photo quality pictures. An image setter produces high quality output compared to an ordinary laser printer. An image setter is a high resolution output device that can transfer electronic text and graphics directly to film, plates, or photo-sensitive paper. 2. ScannersIn computing, a scanner is a device that analyzes images, printed text, handwriting, or objects (such as an ornament) and converts it into a digital image. examples of scanners: 3. LCD ProjectorLCD projector is a type of video projector for displaying video, images or computer data on a screen or other flat surface. It is a modern equivalent of the slide projector or overhead projector. A Liquid Crystal Display (LCD) projector uses its own light source to project what is displayed on the computer onto a wall or projection screen. A digital light processing (DLP) projector uses tiny mirrors to reflect light that can be seen clearly in a well-lit room. 4. Digital CamerasDigital Cameras are electronic devices used to capture and store photographs digitally, using the memory card without using photographic film like conventional cameras, or recording images in an analog format to magnetic tape like many video cameras. Modern compact digital cameras are typically multifunctional, with some devices capable of recording sound and/or video as well as photographs. 5. External CD DrivesExternal storage is an alternative storage. It is very useful to store programs and data for future use. The storage is required for two reasons:
1. The working memory of the CPU is limited in size and cannot always hold the amount of data required. 2. Data and programmes in storage do not disappear when the power is turned off.
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