Mouse And Types of Mouse Buttons And Its Functions

Mouse:

Mouse is an common Input devise which is mostly used by all computer users. It is mostly used to control the cursor or pointer on a display screen.


Types Of Mouse Button:

1) Left Mouse button

2) Right Mouse button

3) Scroll Wheel button

Left Mouse button is called as Primary mouse Button. It is used to open a application by double clicking on the application short keys.

Right Mouse button is called Secondary mouse Button.

Scroll Mouse button is used to scroll across a large document.


Functions of Mouse:

1) Clicking

2) Double Clicking

3) Right clicking

4) Clicking and dragging

Output Devices

Output is defined as any thing that comes out of computer.The output devices are capable of presenting information from a computer in man Language. There are many output devices attached with the computers. Monitors and Printers are two commonly used output devices.


* Monitor

* Printer

*Speaker


Monitor:

  Monitor is otherwise called as Display Screen. It provides a visual display of data or output.Monitors display images and text. The smallest dot that can be displayed is called a pixel. The resolution of the screen improves as the number pixels is increased. Most of the monitors have a 4 : 3 width to height ratio. This is called ' Aspect ratio '.


Printers:

  Printer is an output devices the prints text or images on paper or other media. You can create a hard copy of a document with the help of printer. There are many type of printer, which vary in their speed and print quality. There are two type of printers impact and non-impact printer.


Speakers:

  Speaker is used to produce voice output. Using speakers along with speech synthesizer software3, the compute fan provide voice output. Voice output has become very common in many places like airlines, banks, automatic telephone enquiry system etc.Users can also hear music/songs using the voice output system.

Input Devices

Input devices are used to feed data into a computer. For example Keyboard, Mouse, Scanner are some of the examples of input devices. It is also defined as a device that provides communication between the user and the computer. Input devices are capable of converting data form man language to machine language (Computer Language). A computer can have several input devices.


* Keyboard

* Mouse

* Touch Screen

* Scanner

* Bar Code Reader

* Digital Camera

* Magnetic Ink Character Recognition (MICR)

* Light Pen

* Microphone

* Smart Cards

* Magnetic Reader


Keyboard:

The Keyboard a common Input devices. Keyboard consist of set of alphabetic, numerical and Symbols Keys.


Mouse:

Mouse is used control the movement of the cursor on the screen. If we like to open a application in our  computer by Left clicking the Application


Touch Screen:

It is a type of screen which have a touch sensitive panel. You can use your fingers to directly touch the objects on the screen. The touch screen senses the touch on the object and communicate the object selection to the computer.


Scanner:

Scanner is an input device that allows information such as an image of text to be input in to a computer. It can read images text printer on a paper and translate the information in to a form that the computer.


Bar Code Reader:

The bar code readers are used in many places like colleges, supermarket, bookshops, etc.  Bar code is a pattern printed in lines of different thickness. The bar-code reader scans the information on the codes and transmits to the computer for further processing.


Digital Camera:

Digital camera is an input device mainly used to capture images. The digital camera takes a still photograph, stores it and sends it as digital input to the computer. It is a modern and popular input device.


Magnetic Ink Character Recognition (MICR):

MICR is widely used by banks to process cheques. Human readable numbers are printed on documents such as cheque using a special magnetic ink. The cheque can be read using a space input unit, which can re recognize magnetic ink characters. ?It also saves time, ensures security and accuracy of data.


Light Pen:

A light pen is a pointing device shaped like a pen and is connected to a monitor. The top to the light pen contains a light sensitive element which, when placed against the screen, detects the light from the screen enabling the compute to identify the location of the pen on the screen.


Magnetic Reader:

Magnetic reader is an input device which reads a magnetic strip on a card. It is handy and data an be stored and retrieved also provides quick identification of the card'd owner.


Smart Cards:

This input device stores data in a microprocessor embedded in the card. This allows information, which can be updated, to be stored on the card. These data can be read and given ad input to the computer for further processing.


Microphone:

Microphone serves as a voice input device. It captures the voice data and input o the computer. Using the microphone along with speech recognition software can offer a completely new approach to input information in to your computer.

Classification of Computer Based on Principles of Operation

Based on the principles of operation computers are classified in to Three types, Analog computers, Digital computers ans Hybrid computers.


* Analog computers

* Digital computers

* Hybrid computers


Analog Computers:

  Analog Computer is a computing device that works on continuous range of values. The analog computers give approximate results since they deal with quantities that vary continuously. It generally deals with physical variables such as voltage pressure, temperature, speed etc.


Digital Computers:

  On the other hand a digital computer operates on digital data such as numbers. It uses binary number system in which there are only two 0 and 1. Each one is called a bit. The digital computer is designed using digital circuits in which there are two levels for a input or output signal. That two levels are known as logic 0 and logic 1. digital computers  can give the results with more accuracy and at a faster rate.


Hybrid Computers:

   Hybrid Computer have the combined features of both analog and digital computers. It is mostly used for automatic operations of complicated physical processes and machines. Now a days analog to digital and digital to analog converters are used for transforming the data into suitable form for either type of
computation.

Software And Type of Softwares

Software refers to a program that makes the computer to do something meaningful. It is the planned, step-by-step instructions required to turn data into information. Software can be classified in to two types


* System software


* Application software



System Software:

    System software consists of general program,s written for a computer. These programs provide dthe environment o run the application programs. System software comprises program,s, which interact with the hardware at a very basic level. System act as the interface between hardware and the user. Operating system, compilers and utility programs are examples of system software.


Application Software:

    Application Software consists of programs designed to solve a user problem. It is used to accomplish specific tasks rather than just managing a computer system. Application software are in turn, controlled bu system software which manages hardware devices.Railway Station, game programs etc are some of the examples of Application Software.

What is a Computer

A Computer is an electronic machine, capable of performing basic operations like addition, subtraction, multipli cation, division etc. The computer is also capable of storing information,which can be used later. A computer can        
process millions of instructions in a few seconds and at the same time with high accuracy. Computers are very accurate and save time by performing the assigned task very fast.