Various types of display outputs as well as printers and audio devices continue to evolve daily. Now, have you ever wondered why the keys on a keyboard are not in alphabetic order? The polarization of one layer, containing long thin molecules called liquid crystals, can be controlled electronically at each pixel, blocking varying amounts of the light to make a pixel lighter or darker. Modern Keyboards have more than just the letter and numeric keys. Gamepad A computer can serve many purposes. On the basis of their printing techniques, printers are grouped as follows: 1. The newer optical mouse does not use a rolling ball, but instead uses a light and a small optical sensor to detect the motion of the mouse by tracking a tiny image of the desk surface.
Joysticks Trackball Joysticks and other game controllers can also be connected to a computer as pointing devices. According to the most technical definition, the only pieces of a computer notconsidered to be peripherals are the central processing unit, power supply, motherboard, and computer case. Technically mice are composite devices, as they both track movement and provide buttons for clicking, but composite devices are generally considered to have more than two different forms of input. Non-Volatile Memory Solid-state drives are one of the latest forms of non-volatile memory. Headphones headphones are a hardware device that either plugs into your computer line out or your speakers and allow you to privately listen to audio without disturbing anyone else.
Many devices are capable of storing such information. It can also be used for making drawings directly on the monitor screen. The term primary memory is used for storage systems which function at high-speed i. From the human 's perspective, the process of reading or seeing these representations is receiving output; this type of interaction between computers and humans is studied in the field of. After processing the raw facts called data , it produces useful information for the user. Doing this provides an individual with a disability with a tool that utilizes his or her abilities to access a computer. Windows, Apple software , microprocessors e.
These devices are responsible for transmitting data in to a form that we as humans are able to interpret, e. A gamepad is used for controlling games, with few buttons that controls the movements of character in a Computer Game. That can be used with the computer. Not all of the screen area may be usable for image display, so the viewable area is also specified. Digital Camera Digital Cameras are used to capture images. Because it would be a waste for a processor to be idle while it waits for data from an input device there must be provision for generating and the corresponding type numbers for further processing by the processor if required. Trackballs have traditionally had the same problem as mice: dirty rollers can make their cursor control jumpy and unsmooth.
Input is any data that we send to a computer for processing. Dot matrix printers use small electromagnetically activated pins in the print head, and an inked ribbon, to produce images by impact. Display Devices A display device is an output device that visually conveys text, graphics, and video information. A pointing device is any human interface device that allows a user to input spatial data to a computer. Composite Devices Wii Remote with attached strap Input devices, such as buttons and joysticks, can be combined on a single physical device that could be thought of as a composite device. The text which is to be scanned is illuminated by a low frequency light source. Different types of printers are available for various purposes.
Output Devices The devices which are used to display the results or information are called Output Devices. You can use a keyboard and mouse for gaming but a specialized Hardware device, i-e a Gamepad can also be used. Speaker act Output Device and Microphone act as Input device 5. Normally they come in a pair and have different shapes and sizes. Pictures are displayed by using a large number of very small dots on screen called pixels.
What has happened, happened fair, What is happening, happening fair! The result is then sent to an output device such as a screen. Inkjet Printer This type of printer prints by spraying tiny ink droplets on the paper. The program processes the inputs and gives an output. Scanner We can store pictures, photographs, diagrams into the computer with the help of scanner. The drum then rolls through toner tiny plastic particles of pigment that are attracted to the charged areas of the drum. This printer is noisy with a low print quality.
Usually, the word peripheral is used to refer to a device external to the computer case, like a scanner, but the devices located inside the computer case are also technically peripherals. The designation of a device as either input or output depends on perspective. What u have given, given here! These printers are slow and noisy, and are not commonly used for personal computers anymore but they can print multi-layer forms, which neither ink jet or laser printers can. Scanners A scanner is a device that images a printed page or graphic by digitizing it, producing an image made of tiny pixels of different brightness and color values which are represented numerically and sent to the computer. Printed output is also called Hard Copy output because unlike monitor, this output can be preserved even if the computer is switched off. Dot-Matrix, Ink-Jet, Laser-Jet are the different types of printers.
Optical mice avoid the problem of a dirty mouse ball, which causes regular mice to roll unsmoothly if the mouse ball and internal rollers are not cleaned frequently. With direct input, the input space coincides with the display space, i. Similarly, printers and monitors take signals that a computer outputs as input, and they convert these signals into a representation that human users can understand. However, the layout of numeric keys on a keyboard are designed for speed typing. In the context of the programming language, the input and output facilities are collectively referred to as transput. The computer sits between the input and output devices. Introduction Computer being a versatile machine can process different types of data.