input and output devices of a computer pdf

Input And Output Devices Of A Computer Pdf

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A peripheral device is generally defined as any auxiliary device such as a computer mouse or keyboard, that connects to and works with the computer in some way. RAM—random access memory—straddles the line between peripheral and primary component; it is technically a storage peripheral, but is required for every major function of a modern computer and removing the RAM will effectively disable any modern machine. Many new devices such as digital watches, smartphones and tablet computers have interfaces which allow them to be used as a peripheral by a full computer, though they are not host-dependent as other peripheral devices are. According to the most technical definition, the only pieces of a computer not considered to be peripherals are the central processing unit, power supply, motherboard, and computer case.

Input and Output Devices of Computer

An output device is any piece of computer hardware equipment which converts information into human read able form. It can be text , graphics , tactile , audio , and video. A new type of Output device is being developed these days, known as Speech synthesizer , [2] a mechanism attached to the computer which produces verbal output sounding almost like human speeches. A display device is the most common form of output device.

It presents output visually on computer screen. The output appears temporarily on the screen and can easily altered or erased, it is sometimes referred to as soft copy also. The display device for a desktop PC is called monitor. With all-in-one PCs, notebook computers, hand held PCs and other devices; the term display screen is used for the display device.

The display devices are also used in home entertainment systems, mobile systems, cameras and video games. Display devices form images by lighting up the proper configurations of pixels. Monochrome monitors actually display two colors, one for the foreground and one for the background.

The colors can be black and white, green and black, or amber and black. The Colored Monitor is a display device capable of displaying many colors. The Color monitors can display anywhere from 16 to over 1 million different colors. A monochrome monitor is a type of CRT computer display which was very common in the early days of computing , from the s through the s, before color monitors became popular.

The most important component in the monitor is the picture tube. CRT basically means cathode ray tube. To form the image on the screen, an electronic gun sealed inside a large glass tube fires electrons at phosphorous coated screen to light up the appropriate pixels in the appropriate color to display images.

Typical refreshment rates are between 60 and 85 times in a second. They are still widely used in applications such as computerized cash register systems. Green screen was the common name for a monochrome monitor using a green "P1" phosphor screen. The color monitors are sometimes called RGB monitors, because they accept three separate signals red, green, and blue. In contrast, a monochrome monitor can display only two colors one for the background and one for the foreground.

Color monitors implement the RGB color model by using three different phosphors that appear red, green, and blue when activated. By placing the phosphors directly next to each other, and activating them with different intensities, color monitors can create an unlimited number of colors. In practice, however, the real number of colors that any monitor can display is controlled by the video adapter.

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What are input and output devices?

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An output device is any piece of computer hardware equipment which converts information into human read able form. It can be text , graphics , tactile , audio , and video. A new type of Output device is being developed these days, known as Speech synthesizer , [2] a mechanism attached to the computer which produces verbal output sounding almost like human speeches. A display device is the most common form of output device. It presents output visually on computer screen. The output appears temporarily on the screen and can easily altered or erased, it is sometimes referred to as soft copy also. The display device for a desktop PC is called monitor.

Output Device can produce the final product of machine processing into a form usable by humans. It provides man to machine communication. Keyboard is most common input device is used today. The data and instructions are input by typing on the keyboard. The message typed on the keyboard reaches the memory unit of a computer.

Computer Input And Output Device PDF in Hindi

Choose the correct option and mark your choice against the corresponding question number in the given answer sheet by darkening the corresponding circle with a lead pencil. Now they are also used with nonportable desktop computer systems because they occupy less table space. Non-impact printers. Can print many special characters, different sizes of print, and graphics such as charts and graphs Are non-impact printers Most laser printers are monochrome, but color laser printers are also available Low speed laser printers can print 4 to 12 pages per minute.

Keyboard is the most common and very popular input device which helps to input data to the computer. The layout of the keyboard is like that of traditional typewriter, although there are some additional keys provided for performing additional functions. These keys include the letter keys A-Z and digit keys 09 which generally give the same layout as that of typewriters. It is used to enter the numeric data or cursor movement. Generally, it consists of a set of 17 keys that are laid out in the same configuration used by most adding machines and calculators.

An input device sends information to a computer system for processing , and an output device reproduces or displays the results of that processing. Input devices only allow for input of data to a computer and output devices only receive the output of data from another device. Most devices are only input devices or output devices, as they can only accept data input from a user or output data generated by a computer.

Input devices

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Chapter 9: Input-Output Devices

 А-а, Росио - прелестное создание.

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