Power Supply

*A power supply may obtain energy from:

Electrical energy transmission systems.
Common examples of this include power supplies that convert AC line voltage to DC voltage.
Energy Storage devices such asbatteries andfuel cells.
Electromechanical systems such as generators and alternators.
Solar power.

FSP250-60ATV-1A - 250 Watt ATX Power Supply

=>C:\Documents and Settings\cyber41\Desktop\power supply.gif

*Key Features:

Replaces Dell Dimension 8300 power supplies.
Common replacement power supply for HP, Compaq and Dell.
Integrated noise killer.
Internal ball bearing fan.

LT701

LT 322

CHAPTER 11 INFORMATION SYSTEMS

What is Information Systems?

Reference: http://www.youtube.com/watch?v=fJYFpwbvuDc

System Unit --ROM

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The system unit includes the chassis, microprocessor, main memory, bus, and ports, but does not include the keyboard or monitor, or any peripheral devices.
A system unit is sometimes called a box or main unit.

How to Assemble a System unit.wmv :(2)

ROM(Read-Only Memory)

PROM (Programmable Read-Only Memory)
EPROM (Erasable Programmable Read-Only Memory)
EEPROM (Electrically Erasable Programmable Read-Only Memory)

1. PROM (Programmable Read-Only Memory)

The process is known as burning the PROM.
This device uses high voltages to permanently destroy or create internal links (fuses or anti-fuses) within the chip.
It is a permanent storage device that becomes a read-only memory after it is written once by the customer rather than by the chip manufacturer.
They are frequently seen in video game consoles, or such products as electronic dictionaries, where PROMs for different languages can be substituted.

2. EPROM (Erasable Programmable Read-Only Memory)

A type of computer memory chip that retains its data when its power supply is switched off & it is non-volatile.
It can be erased only by exposing it to strong ultraviolet light & normally used in electronic circuits.
EPROMs are easily recognizable by the transparent fused quartz window in the top of the package, through which the silicon chip can be seen, and which permits UV light during erasing.

3. EEPROM (Electrically Erasable Programmable Read-Only Memory)

EEPROM-chip can be erased, either within a computer or externally, by electric power.
There are two types of EEPROM: Electrically alterable read-only memory (EAROM) and Flash memory (or simply flash).
It is a technology that is primarily used in memory cards and USB flash drives for general storage and transfer of data between computers and other digital products.

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Citation:

-(1)http://www.webopedia.com/TERM/S/system_unit.html

-(2)http://www.youtube.com/watch?v=n6umAYBUYHE&feature=related

-(3)http://sunwayiconz.wordpress.com/

How To Protect Your Computer From Snoops??

How To Protect Your Computer From Snoops on Howcast

Reference:

http://www.howcast.com/videos/38492-How-To-Protect-Your-Computer-From-Snoops

The Environmental Protectin Agency (EPA) created the Energy Star program. The goal is to reducing power requirements for system units, monitors, and printers. For more information, please refer to http://www.greenpc.com.au/

http://www.ecs.com.tw/ECSWebSite/Support/Support_Article_Detail.aspx?Menuid=54&Article_ID=11&LanID=0

http://www.mhccpa.com/Go_Green.html

The Green PC

The basic elements of the Green PC are :

~ system unit :

By using the portable computers, we can : uses the energy-saving microprocessor, the portable computers can shift to sleep mode when not in operation, replaces the conventional power supply unit with an adapter that requires less electricity and eliminatesthe cooling fan.

~ display :

Made more energy efficient by using flat panels, special power-down monitors, and screen-saver software.

~ manufacuring :

Intel, Apple,Compaq and others are using fewer harmful chemicals in production. Particular attention is given to chlorofluorocarbons(CFCs) in solvents and cleaning agents. Not all the manufacturing are using this kind of chemical to create a new computer.

Personal Responsibility

~ conserve :
The EPA estimates that 30-40% of computer users leave their computer running days, night & weekends. 80% of monitor are on, no one is looking at it. To solve this problems we can use the screen-saver programs that blank the computer screen after 3 - 5 minutes of inactivity.

~recycle :
The things always recycle that we can see is papers. Other recycle items include computer boxes, packaging material, printer catridges & floopy disks.

http://www.ecokaki.com/?p=94

~educate :
Carefully and learn more about ecological dangers of all types. Make you concerns to known manufacturers & retail agencies.

Summary :
As a user of computers,we need to take responsible to the environment protection. Nowaday, many people already have their own computer, but they are not use it with wisely. Some of us will open their computer in whole day, they also not turn off their computer when not to use it. This is a electrical wasting behaviour. The higher technology are create the more pollution of environment. So, we suggest all the users of computer please shut down your computer when not to use its.

http://desktopcomputerpcaccessories.com/

http://ready2beat.com/technology/calculate-your-ecological-footprint

Citation :

- http://www.greenpc.com.au/

- More the information are come from Computing Essentials Complete 2010

CHAPTER10 - PRIVACY AND SECURITY

GREEN PC

http://news.bigdownload.com/bloggers/rafe-brox/page/2/

Green computing or green IT, refers to environmentally sustainable computing or IT.
In the article Harnessing Green IT: Principles and Practices, San Murugesan defines the field of green computing as "the study and practice of designing, manufacturing, using, and disposing of computers, servers, and associated subsystems—such as monitors, printers, storage devices, and networking and communications systems—efficiently and effectively with minimal or no impact on the environment."
The goals of green computing are similar to green chemistry; reduce the use of hazardous materials, maximize energy efficiency during the product's lifetime, and promote the recyclability or biodegradability of defunct products and factory waste.
Research continues into key areas such as making the use of computers as energy-efficient as possible, and designing algorithms and systems for efficiency-related computer technologies.
Many governmental agencies have continued to implement standards and regulations that encourage green computing.

Citation:

Y.E.S

Wednesday, March 9, 2011