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CHAPTER 3 (Computer And Mobile Device)


Chapter 3 Computers and Mobile Device


Objectives Overview
§  Describe the characteristics and uses of desktops, laptops, tablets, and handheld computers.
§  Describe the characteristics and types of server
§  Differentiate among POS terminals, ATMs, and self-service kiosks
§  Describe cloud computing and identity its uses
§  Describe the characteristics and uses of smartphone, digital cameras, portable media player, and e-book readers
§  Describe the characteristics of and ways to interact with game device
§  Identify uses of embedded computers
§  Differentiate a port from a connector, identify various ports and connectors, and differentiate among Bluetooth, Wi-Fi, and NFC wireless device connections.

Types of computers include :
1. Desktop and mobile computers
2. Servers and terminals
3. Smartphones, digital cameras, e-book readers and portable
4. Game devices
5. Embedded computers


Desktops And Mobile Computers
Ø  Personal computer (PC) = A computer that can perform all of its input, processing, output, and storage activities by itself and is intended to be used by one person at a time
Ø  Mobile computer = A portable personal computer, designed so that a user easily can carry it from place to place
Ø  Desktop, or desktop computer = A personal computer designed to be in a stationary location, where all of its components fit on or under a desk or table
Ø  Laptop, also called a notebook computer = A thin, lightweight mobile computer with a screen in its lid and a keyboard in its base
Ø  Tablet = A thin, lightweight mobile computer that has a touch screen
Ø  Handheld computer = A computer small enough to fit in one hand
Ø  Server = A computer dedicated to providing one or more services to other computers or devices on a network (Rack server, blade server, tower server

Server VS Supercomputer

SERVER
SUPERCOMPUTER
Serves bits and bytes of data that enter and leave the server 
Regular hardware combined in enormous proportions
Web servers-processing requests from surfers and sending them back data
Contain so many processors
Web browsers - assemble that data to generate Web pages
Predict the weather, build airplanes, model the brain and simulate the way the planet works.
Server send files in a network
Sequoia Blue Gene/Q supercomputer processing 504 billion events per second(2013) ≈1 million desktop computers.

Terminals
A terminal is a computer, usually with limited processing power, that enables users to send data to and/or receive information from a server, or host computer. Most retail stores use a point of sale (POS) terminal to record purchases, process credit or debit cards, and update inventory.
A self-service kiosk is a freestanding terminal that usually has a touch screen for user interaction.

SERVER
SUPERCOMPUTER
Serves bits and bytes of data that enter and leave the server 
Regular hardware combined in enormous proportions
Web servers-processing requests from surfers and sending them back data
Contain so many processors
Web browsers - assemble that data to generate Web pages
Predict the weather, build airplanes, model the brain and simulate the way the planet works.
Server send files in a network
Sequoia Blue Gene/Q supercomputer processing 504 billion events per second(2013) ≈1 million desktop computers.

Game Devices
1)    Game console = A mobile computing device designed for single-player or multiplayer video games
2)    Handheld game device = A small mobile device that contains a screen, speakers, controls, and game console all in one unit
Embedded Computers
A special-purpose computer that functions as a component in a larger product
·         Consumer electronics
·         Home automation devices
·         Automobiles
·         Process controller and robotics
·         Computer devices and office machines

 Ports and Connections

USB port = Short for universal serial bus port, can connect up to 127 different peripheral devices together with a single connector

Protecting Hardware 
v  Surge protector = Uses electrical components to provide a stable current flow and minimize the chances of an overvoltage reaching the computer and other electronic equipment
v  Uninterruptible power supply (UPS) = A device that contains surge protection circuits and one or more batteries that can provide power during a temporary or permanent loss of power.

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