Presentation on Computer

Made by:- Aana singhClass:- 9th B

An Overview of

Computer

Chapter-1

Computer is a machine that perform four basic operations : input, Output, Storage, Processing.

These four operation called information processing cycle.

Basic Definition Of Computer

The computer does its primary work in a part of the machine we cannot see, a control centre that converts data input to information output. This control centre, called the central processing unit (CPU), is a highly complex, extensive set of electronic circuitry that executes stored program instructions.

Working of Computer

MotherboardCPURAM Hard DiskProcessorBusROM

Components

Block Diagram

BusinessMedical & health careCommunicationEducation & referenceScience ,research & EngineeringManufacturingLaw enforcement by PoliceGovernmentMilitaryMusic, Theatre & film

Applications

Speed(1,000,000 per sec)AccuracyDiligenceVersatilityPower of rememberingNo IQNo feelingStorageReliability

Characteristics of Computer

Analog Digital Super Mainframe Mini MicroHybrid

Types Of Computer

Technological convergence is the process by which existing technologies merge into new forms that bring together different types of media and applications. New devices and technology usually handle one medium or accomplish some basic tasks; through technological convergence, devices can interact with a wider array of media types. For example, a new type of media storage often require new players that only play that format. As the technology advances, however, new models might include additional features like the ability to interface with more devices or play other types of media.

Convergence of Technology

A Functional Overview

of Computer

(Components)

Chapter-2

KeyboardMouseJoystickScannerOptical Character Reader(OCR)Magnetic Ink Character Reader(MICR)Light PenMicrophoneDigital CamerasBar Code Readers

The Input Unit

A computer keyboard distinguishes each physical key from every other and reports all key presses to the controlling software. Keyboards are also used for computer gaming, either with regular keyboards or by using keyboards with special gaming features, which can expedite frequently used keystroke combinations. A keyboard is also used to give commands to the operating system of a computer.

Keyboard

 mouse is a pointing device that detects two-dimensional motion relative to a surface. This motion is typically translated into the motion of a pointer on a display, which allows for fine control of a graphical user interface

Mouse

A joystick is an input device consisting of a stick that pivots on a base and reports its angle or direction to the device it is controlling. A joystick, also known as the control column, is the principal control device in the cockpit of many civilian and military aircraft, either as a centre stick or side-stick. It often has supplementary switches to control various aspects of the aircraft's flight.

Joystick

A scanner is an input device that scans documents such as photographs and pages of text. When a document is scanned, it is converted into a digital format. This creates an electronic version of the document that can be viewed and edited on a computer.

Scanner

OCR, is the mechanical or electronic conversion of scanned or photographed images of typewritten or printed text into machine-encoded/computer-readable text. It is widely used as a form of data entry from some sort of original paper data source, whether passport documents any number of printed records. It is a common method of digitizing printed texts so that they can be electronically edited, searched, stored more compactly, displayed on-line, and used in machine processes .

Optical Character Reader

Magnetic Ink Character Re is a character recognition system that uses special ink and characters. When a document that contains this ink needs to be read, it passes through a machine, which magnetizes the ink and then translates the magnetic information into characters.

MICR technology is used by banks. Numbers and characters found on the bottom of checks (usually containing the check number, sort number, and account number) are printed using Magnetic Ink. To print Magnetic Ink need, you need a laser printer that accepts MICR toner.

MICR

A light pen is a computer input device in the form of a light-sensitive wand used in conjunction with a computer's CRT display.

It allows the user to point to displayed objects or draw on the screen in a similar way to a touch screen but with greater positional accuracy.

Light Pen

A microphone is an acoustic-to-electric transducer or sensor that converts sound in air in to an electrical signal. Microphones are used in many applications recording voice, speech recognition, VoIP, and for non-acoustic purposes such as ultrasonic checking or knock sensors.

Microphone

A digital camera (or digicam) is a camera that encodes digital images and videos digitally and stores them for later reproduction. digital cameras are incorporated into many devices ranging from PDAs and mobile phones to vehicles.

Digital and film cameras share an optical system, typically using a lens with a variable diaphragm to focus light onto an image pickup device.

Digital Camera

A barcode reader  is an electronic device for reading printed barcodes. Like a flatbed scanner, it consists of a light source, a lens and a light sensor translating optical impulses into electrical ones. Additionally, nearly all barcode readers contain decoder circuitry analyzing the barcode's image data provided by the sensor and sending the barcode's content to the scanner's output port.

Bar Code Reader

MonitorPrinterPlotterSpeaker

Output Unit

A monitor or a display is an electronic visual display for computers. The monitor comprises the display device, circuitry and an enclosure. The display device in modern monitors is typically a thin film transistor liquid crystal display (TFT-LCD) thin panel, while older monitors used a cathode ray tube (CRT) about as deep as the screen size.

Monitor

A printer is an external hardware device responsible for taking computer data and generating a hard copy of that data. Printers are one of the most used peripherals on computers and are commonly used to print text, images, and photos.

Printer

A device that draws pictures on paper based on commands from a computer. Plotters differ from printers in that they draw lines using a pen. As a result, they can produce continuous lines, whereas printers can only simulate lines by printing a closely spaced series of dot. Plotters are used to print designs of ships and machines, plans for buildings and so on.

Plotter

Computer speakers, or multimedia speakers, are speakers external to a computer, that disable the lower fidelity built-in speaker. They often have a low-power internal amplifier.

A hardware device connected to a computer's sound card that outputs sounds generated by the computer.

Speaker