Computer Input Devices

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Question 1- Explain functional aspects of following in a computer system: (a) Input devices. (b) Output devices. Answer: The computer will be of no use unless it is able to communicate with the outside world. Input/output devices are required for users to communicate with the computer. In simple terms, input devices bring information INTO the computer and output devices bring information OUT of a computer system. These input/output devices are also known as peripherals since they surround the CPU and memory of a computer system. (a) Input Devices. In computing, an input device is a peripheral (piece of computer hardware) used to provide data and control signals to an information processing system such as a computer. Input devices are necessary…show more content…
Input devices function differently and fall into different categories. Certain input devices fall in the modality of input category such as visual, audio or has got mechanical motion. Other input devices fall into the continuous or discrete category, while another group of input devices fall into the pointing devices category. Pointing devices are further divided depending on whether they provide direct input and indirect input. Light pens and touch screens are examples of input devices that provide direct input, while the mouse and trackball fall under input devices that provide indirect input. (b) Output Devices An output device is any piece of computer hardware item which utilizes whatever data and commands from your computer in order to perform a task. This leads to the results of data processing carried out by a computer which converts the electronically generated information into human-readable form. Output devices can adopt different shapes and styles, which are used to give the output of the processing of data. The output can be in any form i.e. typed, printed, sketched, visible, nonviable, audio, video…show more content…
Characteristics of computers: The important characteristics of a computer are described below: 1. Speed A computer is a high speed device which helps us perform millions of calculations and run complex programs at a very fast pace. The speed of the computer Is usually measured in MHz and GHz. 2. Arithmetical and Logical Operations A computer can perform arithmetical and logical operations. In arithmetic operations, it performs the addition, subtraction, multiplication and division on the numeric data. In logical operation it compares the numerical data as well as alphabetical data. 3. Accuracy In addition to being very fast, computer is also very accurate device. It gives accurate output result provided that the correct input data and set of instructions are given to the computer. It means that output is totally depended on the given instructions and input data. If input data is in-correct then the resulting output will be in-correct. In computer terminology it is known as garbage-in garbage-out. 4.
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